软件工程结对功课02

软件工程结对作业02

1.设计思想：

　　本次任务我用php实现的主要功能，默认必须有加减法。

　　首先，创建index.php文件，在HTML语句里创建表单，表单内容包括，出题数目，最大最小值，及其他的一些选项。

　　然后，创建rubric.php文件，将表单信息提交到此文件下，四则运算方法实现时调用传递过来的值。实现四则运算的方法和前几次用Java时的方法差不多，将代码做了修改和优化。将题目和答案分别放入question.txt和answer.txt文件里，以备后用。

　　第三，创建submitAnswer.php、acceptAnswer.php、deleteAnswer.php和judgeAnswer.php文件，分别用于在线提交答案，接收答案，删除答案和判断答案。提交的答案放在answer1.txt文件里，判断答案时通过比较answer.txt和answer1.txt文件里的内容即可。

2.源程序代码

 

<span style="color: #008080;">  1</span> index.<span style="color: #000000;">php</span><span style="color: #008080;">  2</span> <span style="color: #008080;">  3</span> <!--<span style="color: #008080;">  4</span> start <span style="color: #008080;">date</span> 2016/3/28<span style="color: #008080;">  5</span> completion <span style="color: #008080;">date</span> 2016/4/7<span style="color: #008080;">  6</span> <span style="color: #000000;">author Jing</span><span style="color: #008080;">  7</span> <span style="color: #000000;">this program is about four arithmetic operation</span><span style="color: #008080;">  8</span> --><span style="color: #008080;">  9</span> <span style="color: #008080;"> 10</span>     <span style="color: #008080;"> 11</span>         <meta charset="UTF-8"><span style="color: #008080;"> 12</span>         <title>四则运算出题系统</title><span style="color: #008080;"> 13</span>         <script><span style="color: #008080;"> 14             <span style="color: #0000ff;">function<span style="color: #000000;"> check() {<span style="color: #008080;"> 15                 <span style="color: #0000ff;">var tt=/^(0|[1-9]\d*)$/<span style="color: #000000;">;<span style="color: #008080;"> 16                 <span style="color: #0000ff;">if(!tt.test(form1.<span style="color: #008080;">min.<span style="color: #000000;">value))<span style="color: #008080;"> 17 <span style="color: #000000;">                {<span style="color: #008080;"> 18                     alert('最小值输入不合法'<span style="color: #000000;">);<span style="color: #008080;"> 19                     form1.<span style="color: #008080;">min.<span style="color: #000000;">focus();<span style="color: #008080;"> 20                     <span style="color: #0000ff;">return <span style="color: #0000ff;">false<span style="color: #000000;">;<span style="color: #008080;"> 21 <span style="color: #000000;">                }<span style="color: #008080;"> 22                 <span style="color: #0000ff;">if(!tt.test(form1.<span style="color: #008080;">max.value) || (form1.<span style="color: #008080;">max.value<form1.<span style="color: #008080;">min.<span style="color: #000000;">value))<span style="color: #008080;"> 23 <span style="color: #000000;">                {<span style="color: #008080;"> 24                     alert('最大值输入不合法'<span style="color: #000000;">);<span style="color: #008080;"> 25                     form1.<span style="color: #008080;">min.<span style="color: #000000;">focus();<span style="color: #008080;"> 26                     <span style="color: #0000ff;">return <span style="color: #0000ff;">false<span style="color: #000000;">;<span style="color: #008080;"> 27 <span style="color: #000000;">                }<span style="color: #008080;"> 28                 <span style="color: #0000ff;">if(!tt.test(form1.num.value) || (form1.num.value==0<span style="color: #000000;">))<span style="color: #008080;"> 29 <span style="color: #000000;">                {<span style="color: #008080;"> 30                     alert('出题数目输入不合法'<span style="color: #000000;">);<span style="color: #008080;"> 31                     form1.num.<span style="color: #000000;">focus();<span style="color: #008080;"> 32                     <span style="color: #0000ff;">return <span style="color: #0000ff;">false<span style="color: #000000;">;<span style="color: #008080;"> 33 <span style="color: #000000;">                }<span style="color: #008080;"> 34         <span style="color: #0000ff;">return <span style="color: #0000ff;">true<span style="color: #000000;">;<span style="color: #008080;"> 35 <span style="color: #000000;">            }<span style="color: #008080;"> 36         </script><span style="color: #008080;"> 37</span>     <span style="color: #008080;"> 38</span>     <span style="color: #008080;"> 39</span>         <button type="button">登录</button>   <button type="button">注册</button><span style="color: #008080;"> 40</span>         <br><br> <span style="color: #008080;"> 41</span>         <center>
<span style="color: #008080;"> 42</span>         <font color="red" size="7" face="楷体">欢迎来到小学四则运算出题系统</font> <br><br><br><span style="color: #008080;"> 43</span>         <span style="color: #008080;"> 44</span>         <form action="rubric.php" target="_blank" method="post" name="form1" onsubmit="return check()">
<span style="color: #008080;"> 45</span>         <font color="red" size="5">默认只有两个数参与运算的加减法</font> <br><br><span style="color: #008080;"> 46</span>         <span style="color: #008080;"> 47</span>         <font color="blue" size="4">请输入参与运算的最小数值（非负整数）</font><span style="color: #008080;"> 48</span>         <input type="text" name="min"> <br><br><span style="color: #008080;"> 49</span>         <span style="color: #008080;"> 50</span>         <font color="blue" size="4">请输入参与运算的最大数值（非负整数且不小于最小数值）</font><span style="color: #008080;"> 51</span>         <input type="text" name="max"> <br><br><span style="color: #008080;"> 52</span>         <span style="color: #008080;"> 53</span>         <font color="blue" size="4">请输入出题数目（正整数）</font><span style="color: #008080;"> 54</span>         <input type="text" name="num"> <br><br><span style="color: #008080;"> 55</span>         <span style="color: #008080;"> 56</span>         <font color="blue" size="4">选择参与运算的数的个数</font><span style="color: #008080;"> 57</span>         <input type="radio" value="2" name="num1" checked>2<span style="color: #008080;"> 58</span>         <input type="radio" value="3" name="num1">3<span style="color: #008080;"> 59</span>         <input type="radio" value="4" name="num1">4 <br><br><!--num1中的1位1 2 3的1，不是l m n的l--><span style="color: #008080;"> 60</span>         <span style="color: #008080;"> 61</span>         <font color="blue" size="4">选择是否加入乘法</font><span style="color: #008080;"> 62</span>         <input type="radio" value="t" name="mul"><span style="color: #000000;">是</span><span style="color: #008080;"> 63</span>         <input type="radio" value="f" name="mul" checked>否 <br><br><span style="color: #008080;"> 64</span>         <span style="color: #008080;"> 65</span>         <font color="blue" size="4">选择是否加入除法</font><span style="color: #008080;"> 66</span>         <input type="radio" value="t" name="div"><span style="color: #000000;">是</span><span style="color: #008080;"> 67</span>         <input type="radio" value="f" name="div" checked>否 <br><br><span style="color: #008080;"> 68</span>         <span style="color: #008080;"> 69</span>         <input type="submit" value="确认" name="send"><span style="color: #008080;"> 70</span>         <input type="reset" value="重置" name="send"><span style="color: #008080;"> 71</span>         </form>
<span style="color: #008080;"> 72</span>         </center><span style="color: #008080;"> 73</span>     <span style="color: #008080;"> 74</span> <span style="color: #008080;"> 75</span> <span style="color: #008080;"> 76</span> rubric.<span style="color: #000000;">php</span><span style="color: #008080;"> 77</span> <span style="color: #008080;"> 78</span> <span style="color: #008080;"> 79</span>     <span style="color: #008080;"> 80</span>         <meta charset="UTF-8"><span style="color: #008080;"> 81</span>         <title>出题界面</title><span style="color: #008080;"> 82</span>     <span style="color: #008080;"> 83</span>     <span style="color: #008080;"> 84</span>         <span style="color: #008080;"> 85</span>         <span style="color: #000000;">php</span><span style="color: #008080;"> 86</span>             <span style="color: #0000ff;">if</span>(<span style="color: #008080;">is_numeric</span>(<span style="color: #800080;">$_POST</span>["max"<span style="color: #000000;">]))</span><span style="color: #008080;"> 87</span> <span style="color: #000000;">            {</span><span style="color: #008080;"> 88</span>                <span style="color: #800080;">$max</span>=<span style="color: #800080;">$_POST</span>["max"];  <span style="color: #008000;">//</span><span style="color: #008000;">最大值</span><span style="color: #008080;"> 89</span> <span style="color: #000000;">            }</span><span style="color: #008080;"> 90</span>             <span style="color: #0000ff;">if</span>(<span style="color: #008080;">is_numeric</span>(<span style="color: #800080;">$_POST</span>["min"<span style="color: #000000;">]))</span><span style="color: #008080;"> 91</span> <span style="color: #000000;">            {</span><span style="color: #008080;"> 92</span>                 <span style="color: #800080;">$min</span>=<span style="color: #800080;">$_POST</span>["min"];  <span style="color: #008000;">//</span><span style="color: #008000;">最小值</span><span style="color: #008080;"> 93</span> <span style="color: #000000;">            }</span><span style="color: #008080;"> 94</span>             <span style="color: #0000ff;">if</span>(<span style="color: #008080;">is_numeric</span>(<span style="color: #800080;">$_POST</span>["num"<span style="color: #000000;">]))</span><span style="color: #008080;"> 95</span> <span style="color: #000000;">            {</span><span style="color: #008080;"> 96</span>                 <span style="color: #800080;">$num</span>=<span style="color: #800080;">$_POST</span>["num"];  <span style="color: #008000;">//</span><span style="color: #008000;">出题数目</span><span style="color: #008080;"> 97</span> <span style="color: #000000;">            }</span><span style="color: #008080;"> 98</span>             <span style="color: #0000ff;">if</span>(<span style="color: #008080;">is_numeric</span>(<span style="color: #800080;">$_POST</span>["num1"<span style="color: #000000;">]))</span><span style="color: #008080;"> 99</span> <span style="color: #000000;">            {</span><span style="color: #008080;">100</span>                 <span style="color: #800080;">$num1</span>=<span style="color: #800080;">$_POST</span>["num1"];  <span style="color: #008000;">//</span><span style="color: #008000;">参与运算的个数</span><span style="color: #008080;">101</span> <span style="color: #000000;">            }</span><span style="color: #008080;">102</span>             <span style="color: #0000ff;">if</span>(<span style="color: #008080;">is_string</span>(<span style="color: #800080;">$_POST</span>["mul"<span style="color: #000000;">]))</span><span style="color: #008080;">103</span> <span style="color: #000000;">            {</span><span style="color: #008080;">104</span>                 <span style="color: #800080;">$mul</span>=<span style="color: #800080;">$_POST</span>["mul"];  <span style="color: #008000;">//</span><span style="color: #008000;">选择是否加入乘法 是t否f</span><span style="color: #008080;">105</span> <span style="color: #000000;">            }</span><span style="color: #008080;">106</span>             <span style="color: #0000ff;">if</span>(<span style="color: #008080;">is_string</span>(<span style="color: #800080;">$_POST</span>["div"<span style="color: #000000;">]))</span><span style="color: #008080;">107</span> <span style="color: #000000;">            {</span><span style="color: #008080;">108</span>                 <span style="color: #800080;">$div</span>=<span style="color: #800080;">$_POST</span>["div"];  <span style="color: #008000;">//</span><span style="color: #008000;">选择是否加入除法 是t否f</span><span style="color: #008080;">109</span> <span style="color: #000000;">            }</span><span style="color: #008080;">110</span>             <span style="color: #008080;">111</span>             <span style="color: #008000;">/*</span><span style="color: #008000;"> 定义数组 </span><span style="color: #008000;">*/</span><span style="color: #008080;">112</span>             <span style="color: #800080;">$a</span>=<span style="color: #0000ff;">array</span>();  <span style="color: #008000;">//</span><span style="color: #008000;">方法中使用，存储随机数字和运算符</span><span style="color: #008080;">113</span>             <span style="color: #800080;">$amd</span>=<span style="color: #0000ff;">array</span>(); <span style="color: #008000;">//</span><span style="color: #008000;">方法中使用，将算好乘/除法后的算式存入此数组</span><span style="color: #008080;">114</span>             <span style="color: #800080;">$b</span>=<span style="color: #0000ff;">array</span>();  <span style="color: #008000;">//</span><span style="color: #008000;">调用方法时使用</span><span style="color: #008080;">115</span>             <span style="color: #800080;">$d</span>=<span style="color: #0000ff;">array</span>();  <span style="color: #008000;">//</span><span style="color: #008000;">存储题目</span><span style="color: #008080;">116</span>             <span style="color: #800080;">$e</span>=<span style="color: #0000ff;">array</span>();  <span style="color: #008000;">//</span><span style="color: #008000;">存储答案</span><span style="color: #008080;">117</span>             <span style="color: #008080;">118</span>             <span style="color: #008000;">/*</span><span style="color: #008000;"> Result 类用于封装结果 </span><span style="color: #008000;">*/</span><span style="color: #008080;">119</span>             <span style="color: #0000ff;">class</span><span style="color: #000000;"> Result</span><span style="color: #008080;">120</span> <span style="color: #000000;">            {</span><span style="color: #008080;">121</span>                 <span style="color: #0000ff;">public</span> <span style="color: #800080;">$r1</span>; <span style="color: #008000;">//</span><span style="color: #008000;">$r1存储计算结果</span><span style="color: #008080;">122</span> <span style="color: #000000;">            }</span><span style="color: #008080;">123</span>             <span style="color: #008080;">124</span>             <span style="color: #008000;">/*</span><span style="color: #008000;"> 运算符只有加减的方法 </span><span style="color: #008000;">*/</span><span style="color: #008080;">125</span>             <span style="color: #0000ff;">function</span> addSub(<span style="color: #800080;">$min</span>,<span style="color: #800080;">$max</span>,<span style="color: #800080;">$num1</span>,<span style="color: #800080;">$result</span><span style="color: #000000;">)</span><span style="color: #008080;">126</span> <span style="color: #000000;">            {</span><span style="color: #008080;">127</span>                 <span style="color: #800080;">$str</span>=<span style="color: #008080;">mt_rand</span>(<span style="color: #800080;">$min</span>,<span style="color: #800080;">$max</span><span style="color: #000000;">);</span><span style="color: #008080;">128</span>                 <span style="color: #800080;">$re</span>=<span style="color: #800080;">$str</span><span style="color: #000000;">;</span><span style="color: #008080;">129</span>                 <span style="color: #0000ff;">for</span>(<span style="color: #800080;">$i</span>=1;<span style="color: #800080;">$i</span>$num1;<span style="color: #800080;">$i</span>++<span style="color: #000000;">)</span><span style="color: #008080;">130</span> <span style="color: #000000;">                {</span><span style="color: #008080;">131</span>             <span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span>]=  <span style="color: #008080;">mt_rand</span>(<span style="color: #800080;">$min</span>,<span style="color: #800080;">$max</span><span style="color: #000000;">);</span><span style="color: #008080;">132</span>                     <span style="color: #800080;">$c</span>=<span style="color: #008080;">mt_rand</span>(0,1<span style="color: #000000;">);</span><span style="color: #008080;">133</span>             <span style="color: #0000ff;">if</span>(<span style="color: #800080;">$c</span>==0<span style="color: #000000;">)</span><span style="color: #008080;">134</span> <span style="color: #000000;">            {</span><span style="color: #008080;">135</span>                         <span style="color: #800080;">$str</span>=<span style="color: #800080;">$str</span>." + ".<span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span><span style="color: #000000;">];</span><span style="color: #008080;">136</span>                         <span style="color: #800080;">$re</span>=<span style="color: #800080;">$re</span>+<span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span><span style="color: #000000;">];</span><span style="color: #008080;">137</span> <span style="color: #000000;">            }</span><span style="color: #008080;">138</span>                     <span style="color: #0000ff;">if</span>(<span style="color: #800080;">$c</span>==1<span style="color: #000000;">)</span><span style="color: #008080;">139</span> <span style="color: #000000;">            {</span><span style="color: #008080;">140</span>                         <span style="color: #800080;">$str</span>=<span style="color: #800080;">$str</span>." - ".<span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span><span style="color: #000000;">];</span><span style="color: #008080;">141</span>                         <span style="color: #800080;">$re</span>=<span style="color: #800080;">$re</span>-<span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span><span style="color: #000000;">];</span><span style="color: #008080;">142</span> <span style="color: #000000;">            }</span><span style="color: #008080;">143</span> <span style="color: #000000;">                }</span><span style="color: #008080;">144</span>                 <span style="color: #800080;">$result</span>->r1=<span style="color: #800080;">$re</span><span style="color: #000000;">;</span><span style="color: #008080;">145</span>                 <span style="color: #800080;">$str</span>=<span style="color: #800080;">$str</span>." = "<span style="color: #000000;">;</span><span style="color: #008080;">146</span>         <span style="color: #0000ff;">return</span> <span style="color: #800080;">$str</span><span style="color: #000000;">;</span><span style="color: #008080;">147</span> <span style="color: #000000;">            }</span><span style="color: #008080;">148</span>             <span style="color: #008080;">149</span>             <span style="color: #008000;">/*</span><span style="color: #008000;"> 运算符为加减乘的方法 </span><span style="color: #008000;">*/</span><span style="color: #008080;">150</span>             <span style="color: #0000ff;">function</span> addSubMul(<span style="color: #800080;">$min</span>,<span style="color: #800080;">$max</span>,<span style="color: #800080;">$num1</span>,<span style="color: #800080;">$result</span><span style="color: #000000;">)</span><span style="color: #008080;">151</span> <span style="color: #000000;">            {</span><span style="color: #008080;">152</span>                 <span style="color: #800080;">$a</span>[0]= <span style="color: #008080;">mt_rand</span>(<span style="color: #800080;">$min</span>, <span style="color: #800080;">$max</span><span style="color: #000000;">);</span><span style="color: #008080;">153</span>                 <span style="color: #008000;">/*</span><span style="color: #008000;"> 将算式中的数和运算符存入数组$a </span><span style="color: #008000;">*/</span><span style="color: #008080;">154</span>                 <span style="color: #008000;">/*</span><span style="color: #008000;">如果此循环中在运算符左右两侧加入空格，则在后面while循环中的if条件语句中的运算符也应加空格，否则会出错</span><span style="color: #008000;">*/</span><span style="color: #008080;">155</span>                 <span style="color: #0000ff;">for</span>(<span style="color: #800080;">$i</span>=1;<span style="color: #800080;">$i</span>$num1-1);<span style="color: #800080;">$i</span>=<span style="color: #800080;">$i</span>+2)  <span style="color: #008000;">//</span><span style="color: #008000;">(2*$num1-1) 为算式中参与运算的数和运算符个数之和</span><span style="color: #008080;">156</span> <span style="color: #000000;">                {</span><span style="color: #008080;">157</span>                     <span style="color: #800080;">$c</span>=  <span style="color: #008080;">mt_rand</span>(0, 2<span style="color: #000000;">);</span><span style="color: #008080;">158</span>                     <span style="color: #0000ff;">if</span>(<span style="color: #800080;">$c</span>==0<span style="color: #000000;">)</span><span style="color: #008080;">159</span> <span style="color: #000000;">            {</span><span style="color: #008080;">160</span>                         <span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span>]=' + '<span style="color: #000000;">;</span><span style="color: #008080;">161</span>                         <span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span>+1]= <span style="color: #008080;">mt_rand</span>(<span style="color: #800080;">$min</span>, <span style="color: #800080;">$max</span><span style="color: #000000;">);</span><span style="color: #008080;">162</span> <span style="color: #000000;">            }</span><span style="color: #008080;">163</span>                     <span style="color: #0000ff;">if</span>(<span style="color: #800080;">$c</span>==1<span style="color: #000000;">)</span><span style="color: #008080;">164</span> <span style="color: #000000;">            {</span><span style="color: #008080;">165</span>                         <span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span>]=' - '<span style="color: #000000;">;</span><span style="color: #008080;">166</span>                         <span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span>+1]= <span style="color: #008080;">mt_rand</span>(<span style="color: #800080;">$min</span>, <span style="color: #800080;">$max</span><span style="color: #000000;">);</span><span style="color: #008080;">167</span> <span style="color: #000000;">            }</span><span style="color: #008080;">168</span>                     <span style="color: #0000ff;">if</span>(<span style="color: #800080;">$c</span>==2<span style="color: #000000;">)</span><span style="color: #008080;">169</span> <span style="color: #000000;">            {</span><span style="color: #008080;">170</span>                         <span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span>]=' x '<span style="color: #000000;">;</span><span style="color: #008080;">171</span>                         <span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span>+1]= <span style="color: #008080;">mt_rand</span>(<span style="color: #800080;">$min</span>, <span style="color: #800080;">$max</span><span style="color: #000000;">);</span><span style="color: #008080;">172</span> <span style="color: #000000;">            }</span><span style="color: #008080;">173</span> <span style="color: #000000;">                }</span><span style="color: #008080;">174</span>                 <span style="color: #008000;">/*</span><span style="color: #008000;"> 将算式中的乘法算完后的算式存入数组$amd </span><span style="color: #008000;">*/</span><span style="color: #008080;">175</span>                 <span style="color: #800080;">$i</span>=0<span style="color: #000000;">;</span><span style="color: #008080;">176</span>                 <span style="color: #800080;">$j</span>=0<span style="color: #000000;">;</span><span style="color: #008080;">177</span>                 <span style="color: #0000ff;">while</span>(<span style="color: #800080;">$i</span>$num1-1)) <span style="color: #008000;">//</span><span style="color: #008000;">运算符左右是否有空格应和上面的for循环保持一致</span><span style="color: #008080;">178</span> <span style="color: #000000;">                {</span><span style="color: #008080;">179</span>                     <span style="color: #0000ff;">if</span>(<span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span>]==' x '<span style="color: #000000;">)</span><span style="color: #008080;">180</span> <span style="color: #000000;">                    {</span><span style="color: #008080;">181</span>                         <span style="color: #800080;">$amd</span>[<span style="color: #800080;">$j</span>-1]=<span style="color: #800080;">$amd</span>[<span style="color: #800080;">$j</span>-1]*<span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span>+1<span style="color: #000000;">];</span><span style="color: #008080;">182</span>                         <span style="color: #800080;">$i</span>=<span style="color: #800080;">$i</span>+2<span style="color: #000000;">;</span><span style="color: #008080;">183</span> <span style="color: #000000;">                    }</span><span style="color: #008080;">184</span>                     <span style="color: #0000ff;">else</span><span style="color: #008080;">185</span> <span style="color: #000000;">                    {</span><span style="color: #008080;">186</span>                         <span style="color: #800080;">$amd</span>[<span style="color: #800080;">$j</span>]=<span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span><span style="color: #000000;">];</span><span style="color: #008080;">187</span>                         <span style="color: #800080;">$j</span>++<span style="color: #000000;">;</span><span style="color: #008080;">188</span>                         <span style="color: #800080;">$i</span>++<span style="color: #000000;">;</span><span style="color: #008080;">189</span> <span style="color: #000000;">                    }</span><span style="color: #008080;">190</span> <span style="color: #000000;">                }</span><span style="color: #008080;">191</span>                 <span style="color: #008000;">/*</span><span style="color: #008000;"> 算出算式的答案$re </span><span style="color: #008000;">*/</span><span style="color: #008080;">192</span>                 <span style="color: #800080;">$re</span>=<span style="color: #800080;">$amd</span>[0<span style="color: #000000;">];</span><span style="color: #008080;">193</span>                 <span style="color: #800080;">$k</span>=1<span style="color: #000000;">;</span><span style="color: #008080;">194</span>                 <span style="color: #0000ff;">while</span>(<span style="color: #800080;">$k</span>$j)  <span style="color: #008000;">//</span><span style="color: #008000;">运算符左右是否有空格应和上面的for循环保持一致</span><span style="color: #008080;">195</span> <span style="color: #000000;">                {</span><span style="color: #008080;">196</span>                     <span style="color: #0000ff;">if</span>(<span style="color: #800080;">$amd</span>[<span style="color: #800080;">$k</span>]==' + '<span style="color: #000000;">)</span><span style="color: #008080;">197</span> <span style="color: #000000;">                    {</span><span style="color: #008080;">198</span>                         <span style="color: #800080;">$re</span>=<span style="color: #800080;">$re</span>+<span style="color: #800080;">$amd</span>[<span style="color: #800080;">$k</span>+1<span style="color: #000000;">];</span><span style="color: #008080;">199</span>                         <span style="color: #800080;">$k</span>=<span style="color: #800080;">$k</span>+2<span style="color: #000000;">;</span><span style="color: #008080;">200</span>                         <span style="color: #0000ff;">continue</span><span style="color: #000000;">;</span><span style="color: #008080;">201</span> <span style="color: #000000;">                    }</span><span style="color: #008080;">202</span>                     <span style="color: #0000ff;">if</span>(<span style="color: #800080;">$amd</span>[<span style="color: #800080;">$k</span>]==' - '<span style="color: #000000;">)</span><span style="color: #008080;">203</span> <span style="color: #000000;">                    {</span><span style="color: #008080;">204</span>                         <span style="color: #800080;">$re</span>=<span style="color: #800080;">$re</span>-<span style="color: #800080;">$amd</span>[<span style="color: #800080;">$k</span>+1<span style="color: #000000;">];</span><span style="color: #008080;">205</span>                         <span style="color: #800080;">$k</span>=<span style="color: #800080;">$k</span>+2<span style="color: #000000;">;</span><span style="color: #008080;">206</span> <span style="color: #000000;">                    }</span><span style="color: #008080;">207</span> <span style="color: #000000;">                }</span><span style="color: #008080;">208</span>                 <span style="color: #008000;">/*</span><span style="color: #008000;"> 将数组中的值连接为字符串算式$str </span><span style="color: #008000;">*/</span><span style="color: #008080;">209</span>                 <span style="color: #800080;">$str</span>=<span style="color: #800080;">$a</span>[0<span style="color: #000000;">];</span><span style="color: #008080;">210</span>                 <span style="color: #0000ff;">for</span>(<span style="color: #800080;">$i</span>=1;<span style="color: #800080;">$i</span>$num1-1);<span style="color: #800080;">$i</span>++<span style="color: #000000;">)</span><span style="color: #008080;">211</span> <span style="color: #000000;">                {</span><span style="color: #008080;">212</span>                     <span style="color: #800080;">$str</span>.=<span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span><span style="color: #000000;">];</span><span style="color: #008080;">213</span> <span style="color: #000000;">                }</span><span style="color: #008080;">214</span>                 <span style="color: #800080;">$result</span>->r1=<span style="color: #800080;">$re</span><span style="color: #000000;">;</span><span style="color: #008080;">215</span>                 <span style="color: #800080;">$str</span>=<span style="color: #800080;">$str</span>." = "<span style="color: #000000;">;</span><span style="color: #008080;">216</span>         <span style="color: #0000ff;">return</span> <span style="color: #800080;">$str</span><span style="color: #000000;">;</span><span style="color: #008080;">217</span> <span style="color: #000000;">            }</span><span style="color: #008080;">218</span>             <span style="color: #008080;">219</span>             <span style="color: #008000;">/*</span><span style="color: #008000;"> 运算符为加减除的方法 </span><span style="color: #008000;">*/</span><span style="color: #008080;">220</span>             <span style="color: #0000ff;">function</span> addSubDiv(<span style="color: #800080;">$min</span>,<span style="color: #800080;">$max</span>,<span style="color: #800080;">$num1</span>,<span style="color: #800080;">$result</span><span style="color: #000000;">)</span><span style="color: #008080;">221</span> <span style="color: #000000;">            {</span><span style="color: #008080;">222</span>                 <span style="color: #800080;">$a</span>[0]= <span style="color: #008080;">mt_rand</span>(<span style="color: #800080;">$min</span>, <span style="color: #800080;">$max</span><span style="color: #000000;">);</span><span style="color: #008080;">223</span>                 <span style="color: #008000;">/*</span><span style="color: #008000;"> 将算式中的数和运算符存入数组$a </span><span style="color: #008000;">*/</span><span style="color: #008080;">224</span>                 <span style="color: #0000ff;">for</span>(<span style="color: #800080;">$i</span>=1;<span style="color: #800080;">$i</span>$num1-1);<span style="color: #800080;">$i</span>=<span style="color: #800080;">$i</span>+2<span style="color: #000000;">)  </span><span style="color: #008080;">225</span> <span style="color: #000000;">                {</span><span style="color: #008080;">226</span>                     <span style="color: #800080;">$c</span>=  <span style="color: #008080;">mt_rand</span>(0, 2<span style="color: #000000;">);</span><span style="color: #008080;">227</span>                     <span style="color: #0000ff;">if</span>(<span style="color: #800080;">$c</span>==0<span style="color: #000000;">)</span><span style="color: #008080;">228</span> <span style="color: #000000;">            {</span><span style="color: #008080;">229</span>                         <span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span>]=' + '<span style="color: #000000;">;</span><span style="color: #008080;">230</span>                         <span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span>+1]= <span style="color: #008080;">mt_rand</span>(<span style="color: #800080;">$min</span>, <span style="color: #800080;">$max</span><span style="color: #000000;">);</span><span style="color: #008080;">231</span> <span style="color: #000000;">            }</span><span style="color: #008080;">232</span>                     <span style="color: #0000ff;">if</span>(<span style="color: #800080;">$c</span>==1<span style="color: #000000;">)</span><span style="color: #008080;">233</span> <span style="color: #000000;">            {</span><span style="color: #008080;">234</span>                         <span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span>]=' - '<span style="color: #000000;">;</span><span style="color: #008080;">235</span>                         <span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span>+1]= <span style="color: #008080;">mt_rand</span>(<span style="color: #800080;">$min</span>, <span style="color: #800080;">$max</span><span style="color: #000000;">);</span><span style="color: #008080;">236</span> <span style="color: #000000;">            }</span><span style="color: #008080;">237</span>                     <span style="color: #0000ff;">if</span>(<span style="color: #800080;">$c</span>==2<span style="color: #000000;">)</span><span style="color: #008080;">238</span> <span style="color: #000000;">            {</span><span style="color: #008080;">239</span>                         <span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span>]=' ÷ '<span style="color: #000000;">;</span><span style="color: #008080;">240</span>                         <span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span>+1]= <span style="color: #008080;">mt_rand</span>(<span style="color: #800080;">$min</span>, <span style="color: #800080;">$max</span><span style="color: #000000;">);</span><span style="color: #008080;">241</span> <span style="color: #000000;">            }</span><span style="color: #008080;">242</span> <span style="color: #000000;">                }</span><span style="color: #008080;">243</span>                 <span style="color: #008000;">/*</span><span style="color: #008000;"> 将算式中的除法算完后的算式存入数组$amd </span><span style="color: #008000;">*/</span><span style="color: #008080;">244</span>                 <span style="color: #800080;">$i</span>=0<span style="color: #000000;">;</span><span style="color: #008080;">245</span>                 <span style="color: #800080;">$j</span>=0<span style="color: #000000;">;</span><span style="color: #008080;">246</span>                 <span style="color: #0000ff;">while</span>(<span style="color: #800080;">$i</span>$num1-1<span style="color: #000000;">))</span><span style="color: #008080;">247</span> <span style="color: #000000;">                {</span><span style="color: #008080;">248</span>                     <span style="color: #0000ff;">if</span>(<span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span>]==' ÷ '<span style="color: #000000;">)</span><span style="color: #008080;">249</span> <span style="color: #000000;">                    {</span><span style="color: #008080;">250</span>                         <span style="color: #0000ff;">while</span>((<span style="color: #800080;">$amd</span>[<span style="color: #800080;">$j</span>-1] % <span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span>+1]!=0) || <span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span>+1]==0 ) <span style="color: #008000;">//</span><span style="color: #008000;">避免除法有余数</span><span style="color: #008080;">251</span> <span style="color: #000000;">                        {</span><span style="color: #008080;">252</span>                             <span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span>+1]=  <span style="color: #008080;">mt_rand</span>(<span style="color: #800080;">$min</span>,<span style="color: #800080;">$max</span><span style="color: #000000;">);</span><span style="color: #008080;">253</span> <span style="color: #000000;">                        }</span><span style="color: #008080;">254</span>                         <span style="color: #800080;">$amd</span>[<span style="color: #800080;">$j</span>-1]=<span style="color: #800080;">$amd</span>[<span style="color: #800080;">$j</span>-1]/<span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span>+1<span style="color: #000000;">];</span><span style="color: #008080;">255</span>                         <span style="color: #800080;">$i</span>=<span style="color: #800080;">$i</span>+2<span style="color: #000000;">;</span><span style="color: #008080;">256</span> <span style="color: #000000;">                    }</span><span style="color: #008080;">257</span>                     <span style="color: #0000ff;">else</span><span style="color: #008080;">258</span> <span style="color: #000000;">                    {</span><span style="color: #008080;">259</span>                         <span style="color: #800080;">$amd</span>[<span style="color: #800080;">$j</span>]=<span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span><span style="color: #000000;">];</span><span style="color: #008080;">260</span>                         <span style="color: #800080;">$j</span>++<span style="color: #000000;">;</span><span style="color: #008080;">261</span>                         <span style="color: #800080;">$i</span>++<span style="color: #000000;">;</span><span style="color: #008080;">262</span> <span style="color: #000000;">                    }</span><span style="color: #008080;">263</span> <span style="color: #000000;">                }</span><span style="color: #008080;">264</span>                 <span style="color: #008000;">/*</span><span style="color: #008000;"> 算出算式的答案$re </span><span style="color: #008000;">*/</span><span style="color: #008080;">265</span>                 <span style="color: #800080;">$re</span>=<span style="color: #800080;">$amd</span>[0<span style="color: #000000;">];</span><span style="color: #008080;">266</span>                 <span style="color: #800080;">$k</span>=1<span style="color: #000000;">;</span><span style="color: #008080;">267</span>                 <span style="color: #0000ff;">while</span>(<span style="color: #800080;">$k</span>$j<span style="color: #000000;">)</span><span style="color: #008080;">268</span> <span style="color: #000000;">                {</span><span style="color: #008080;">269</span>                     <span style="color: #0000ff;">if</span>(<span style="color: #800080;">$amd</span>[<span style="color: #800080;">$k</span>]==' + '<span style="color: #000000;">)</span><span style="color: #008080;">270</span> <span style="color: #000000;">                    {</span><span style="color: #008080;">271</span>                         <span style="color: #800080;">$re</span>=<span style="color: #800080;">$re</span>+<span style="color: #800080;">$amd</span>[<span style="color: #800080;">$k</span>+1<span style="color: #000000;">];</span><span style="color: #008080;">272</span>                         <span style="color: #800080;">$k</span>=<span style="color: #800080;">$k</span>+2<span style="color: #000000;">;</span><span style="color: #008080;">273</span>                         <span style="color: #0000ff;">continue</span><span style="color: #000000;">;</span><span style="color: #008080;">274</span> <span style="color: #000000;">                    }</span><span style="color: #008080;">275</span>                     <span style="color: #0000ff;">if</span>(<span style="color: #800080;">$amd</span>[<span style="color: #800080;">$k</span>]==' - '<span style="color: #000000;">)</span><span style="color: #008080;">276</span> <span style="color: #000000;">                    {</span><span style="color: #008080;">277</span>                         <span style="color: #800080;">$re</span>=<span style="color: #800080;">$re</span>-<span style="color: #800080;">$amd</span>[<span style="color: #800080;">$k</span>+1<span style="color: #000000;">];</span><span style="color: #008080;">278</span>                         <span style="color: #800080;">$k</span>=<span style="color: #800080;">$k</span>+2<span style="color: #000000;">;</span><span style="color: #008080;">279</span> <span style="color: #000000;">                    }</span><span style="color: #008080;">280</span> <span style="color: #000000;">                }</span><span style="color: #008080;">281</span>                 <span style="color: #008080;">282</span>                 <span style="color: #008000;">/*</span><span style="color: #008000;"> 将算式放入字符串$str </span><span style="color: #008000;">*/</span><span style="color: #008080;">283</span>                 <span style="color: #800080;">$str</span>=<span style="color: #800080;">$a</span>[0<span style="color: #000000;">];</span><span style="color: #008080;">284</span>                 <span style="color: #0000ff;">for</span>(<span style="color: #800080;">$i</span>=1;<span style="color: #800080;">$i</span>$num1-1);<span style="color: #800080;">$i</span>++<span style="color: #000000;">)</span><span style="color: #008080;">285</span> <span style="color: #000000;">                {</span><span style="color: #008080;">286</span>                     <span style="color: #800080;">$str</span>.=<span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span><span style="color: #000000;">];</span><span style="color: #008080;">287</span> <span style="color: #000000;">                }</span><span style="color: #008080;">288</span>                 <span style="color: #800080;">$result</span>->r1=<span style="color: #800080;">$re</span><span style="color: #000000;">;</span><span style="color: #008080;">289</span>                 <span style="color: #800080;">$str</span>=<span style="color: #800080;">$str</span>." = "<span style="color: #000000;">;</span><span style="color: #008080;">290</span>         <span style="color: #0000ff;">return</span> <span style="color: #800080;">$str</span><span style="color: #000000;">;</span><span style="color: #008080;">291</span> <span style="color: #000000;">            }</span><span style="color: #008080;">292</span>             <span style="color: #008080;">293</span>             <span style="color: #008000;">/*</span><span style="color: #008000;"> 运算符为加减乘除的方法 </span><span style="color: #008000;">*/</span><span style="color: #008080;">294</span>             <span style="color: #0000ff;">function</span> addSubMulDiv(<span style="color: #800080;">$min</span>,<span style="color: #800080;">$max</span>,<span style="color: #800080;">$num1</span>,<span style="color: #800080;">$result</span><span style="color: #000000;">)</span><span style="color: #008080;">295</span> <span style="color: #000000;">            {</span><span style="color: #008080;">296</span>                 <span style="color: #800080;">$a</span>[0]= <span style="color: #008080;">mt_rand</span>(<span style="color: #800080;">$min</span>, <span style="color: #800080;">$max</span><span style="color: #000000;">);</span><span style="color: #008080;">297</span>                 <span style="color: #008000;">/*</span><span style="color: #008000;"> 将算式中的数和运算符存入数组$a </span><span style="color: #008000;">*/</span><span style="color: #008080;">298</span>                 <span style="color: #0000ff;">for</span>(<span style="color: #800080;">$i</span>=1;<span style="color: #800080;">$i</span>$num1-1);<span style="color: #800080;">$i</span>=<span style="color: #800080;">$i</span>+2<span style="color: #000000;">)</span><span style="color: #008080;">299</span> <span style="color: #000000;">                {</span><span style="color: #008080;">300</span>                     <span style="color: #800080;">$c</span>=  <span style="color: #008080;">mt_rand</span>(0, 3<span style="color: #000000;">);</span><span style="color: #008080;">301</span>                     <span style="color: #0000ff;">if</span>(<span style="color: #800080;">$c</span>==0<span style="color: #000000;">)</span><span style="color: #008080;">302</span> <span style="color: #000000;">            {</span><span style="color: #008080;">303</span>                         <span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span>]=' + '<span style="color: #000000;">;</span><span style="color: #008080;">304</span>                         <span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span>+1]= <span style="color: #008080;">mt_rand</span>(<span style="color: #800080;">$min</span>, <span style="color: #800080;">$max</span><span style="color: #000000;">);</span><span style="color: #008080;">305</span> <span style="color: #000000;">            }</span><span style="color: #008080;">306</span>                     <span style="color: #0000ff;">if</span>(<span style="color: #800080;">$c</span>==1<span style="color: #000000;">)</span><span style="color: #008080;">307</span> <span style="color: #000000;">            {</span><span style="color: #008080;">308</span>                         <span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span>]=' - '<span style="color: #000000;">;</span><span style="color: #008080;">309</span>                         <span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span>+1]= <span style="color: #008080;">mt_rand</span>(<span style="color: #800080;">$min</span>, <span style="color: #800080;">$max</span><span style="color: #000000;">);</span><span style="color: #008080;">310</span> <span style="color: #000000;">            }</span><span style="color: #008080;">311</span>                     <span style="color: #0000ff;">if</span>(<span style="color: #800080;">$c</span>==2<span style="color: #000000;">)</span><span style="color: #008080;">312</span> <span style="color: #000000;">            {</span><span style="color: #008080;">313</span>                         <span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span>]=' x '<span style="color: #000000;">;</span><span style="color: #008080;">314</span>                         <span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span>+1]= <span style="color: #008080;">mt_rand</span>(<span style="color: #800080;">$min</span>, <span style="color: #800080;">$max</span><span style="color: #000000;">);</span><span style="color: #008080;">315</span> <span style="color: #000000;">            }</span><span style="color: #008080;">316</span>                     <span style="color: #0000ff;">if</span>(<span style="color: #800080;">$c</span>==3<span style="color: #000000;">)</span><span style="color: #008080;">317</span> <span style="color: #000000;">            {</span><span style="color: #008080;">318</span>                         <span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span>]=' ÷ '<span style="color: #000000;">;</span><span style="color: #008080;">319</span>                         <span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span>+1]= <span style="color: #008080;">mt_rand</span>(<span style="color: #800080;">$min</span>, <span style="color: #800080;">$max</span><span style="color: #000000;">);</span><span style="color: #008080;">320</span> <span style="color: #000000;">            }</span><span style="color: #008080;">321</span> <span style="color: #000000;">                }</span><span style="color: #008080;">322</span>                 <span style="color: #008000;">/*</span><span style="color: #008000;"> 将算式中的除法算完后的算式存入数组$amd </span><span style="color: #008000;">*/</span><span style="color: #008080;">323</span>                 <span style="color: #800080;">$i</span>=0<span style="color: #000000;">;</span><span style="color: #008080;">324</span>                 <span style="color: #800080;">$j</span>=0<span style="color: #000000;">;</span><span style="color: #008080;">325</span>                 <span style="color: #0000ff;">while</span>(<span style="color: #800080;">$i</span>$num1-1<span style="color: #000000;">))</span><span style="color: #008080;">326</span> <span style="color: #000000;">                {</span><span style="color: #008080;">327</span>                     <span style="color: #0000ff;">if</span>(<span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span>]==' x '<span style="color: #000000;">)</span><span style="color: #008080;">328</span> <span style="color: #000000;">                    {</span><span style="color: #008080;">329</span>                         <span style="color: #800080;">$amd</span>[<span style="color: #800080;">$j</span>-1]=<span style="color: #800080;">$amd</span>[<span style="color: #800080;">$j</span>-1]*<span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span>+1<span style="color: #000000;">];</span><span style="color: #008080;">330</span>                         <span style="color: #800080;">$i</span>=<span style="color: #800080;">$i</span>+2<span style="color: #000000;">;</span><span style="color: #008080;">331</span> <span style="color: #000000;">                    }</span><span style="color: #008080;">332</span>                     <span style="color: #0000ff;">else</span> <span style="color: #0000ff;">if</span>(<span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span>]==' ÷ '<span style="color: #000000;">)</span><span style="color: #008080;">333</span> <span style="color: #000000;">                    {</span><span style="color: #008080;">334</span>                         <span style="color: #0000ff;">while</span>((<span style="color: #800080;">$amd</span>[<span style="color: #800080;">$j</span>-1] % <span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span>+1]!=0) || <span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span>+1]==0 ) <span style="color: #008000;">//</span><span style="color: #008000;">避免除法有余数</span><span style="color: #008080;">335</span> <span style="color: #000000;">                        {</span><span style="color: #008080;">336</span>                             <span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span>+1]=  <span style="color: #008080;">mt_rand</span>(<span style="color: #800080;">$min</span>,<span style="color: #800080;">$max</span><span style="color: #000000;">);</span><span style="color: #008080;">337</span> <span style="color: #000000;">                        }</span><span style="color: #008080;">338</span>                         <span style="color: #800080;">$amd</span>[<span style="color: #800080;">$j</span>-1]=<span style="color: #800080;">$amd</span>[<span style="color: #800080;">$j</span>-1]/<span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span>+1<span style="color: #000000;">];</span><span style="color: #008080;">339</span>                         <span style="color: #800080;">$i</span>=<span style="color: #800080;">$i</span>+2<span style="color: #000000;">;</span><span style="color: #008080;">340</span> <span style="color: #000000;">                    }</span><span style="color: #008080;">341</span>                     <span style="color: #0000ff;">else</span><span style="color: #008080;">342</span> <span style="color: #000000;">                    {</span><span style="color: #008080;">343</span>                         <span style="color: #800080;">$amd</span>[<span style="color: #800080;">$j</span>]=<span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span><span style="color: #000000;">];</span><span style="color: #008080;">344</span>                         <span style="color: #800080;">$j</span>++<span style="color: #000000;">;</span><span style="color: #008080;">345</span>                         <span style="color: #800080;">$i</span>++<span style="color: #000000;">;</span><span style="color: #008080;">346</span> <span style="color: #000000;">                    }</span><span style="color: #008080;">347</span> <span style="color: #000000;">                }</span><span style="color: #008080;">348</span>                 <span style="color: #008000;">/*</span><span style="color: #008000;"> 算出算式的答案$re </span><span style="color: #008000;">*/</span><span style="color: #008080;">349</span>                 <span style="color: #800080;">$re</span>=<span style="color: #800080;">$amd</span>[0<span style="color: #000000;">];</span><span style="color: #008080;">350</span>                 <span style="color: #800080;">$k</span>=1<span style="color: #000000;">;</span><span style="color: #008080;">351</span>                 <span style="color: #0000ff;">while</span>(<span style="color: #800080;">$k</span>$j<span style="color: #000000;">)</span><span style="color: #008080;">352</span> <span style="color: #000000;">                {</span><span style="color: #008080;">353</span>                     <span style="color: #0000ff;">if</span>(<span style="color: #800080;">$amd</span>[<span style="color: #800080;">$k</span>]==' + '<span style="color: #000000;">)</span><span style="color: #008080;">354</span> <span style="color: #000000;">                    {</span><span style="color: #008080;">355</span>                         <span style="color: #800080;">$re</span>=<span style="color: #800080;">$re</span>+<span style="color: #800080;">$amd</span>[<span style="color: #800080;">$k</span>+1<span style="color: #000000;">];</span><span style="color: #008080;">356</span>                         <span style="color: #800080;">$k</span>=<span style="color: #800080;">$k</span>+2<span style="color: #000000;">;</span><span style="color: #008080;">357</span>                         <span style="color: #0000ff;">continue</span><span style="color: #000000;">;</span><span style="color: #008080;">358</span> <span style="color: #000000;">                    }</span><span style="color: #008080;">359</span>                     <span style="color: #0000ff;">if</span>(<span style="color: #800080;">$amd</span>[<span style="color: #800080;">$k</span>]==' - '<span style="color: #000000;">)</span><span style="color: #008080;">360</span> <span style="color: #000000;">                    {</span><span style="color: #008080;">361</span>                         <span style="color: #800080;">$re</span>=<span style="color: #800080;">$re</span>-<span style="color: #800080;">$amd</span>[<span style="color: #800080;">$k</span>+1<span style="color: #000000;">];</span><span style="color: #008080;">362</span>                         <span style="color: #800080;">$k</span>=<span style="color: #800080;">$k</span>+2<span style="color: #000000;">;</span><span style="color: #008080;">363</span> <span style="color: #000000;">                    }</span><span style="color: #008080;">364</span> <span style="color: #000000;">                }</span><span style="color: #008080;">365</span>                 <span style="color: #008000;">/*</span><span style="color: #008000;"> 将算式放入字符串$str </span><span style="color: #008000;">*/</span><span style="color: #008080;">366</span>                 <span style="color: #800080;">$str</span>=<span style="color: #800080;">$a</span>[0<span style="color: #000000;">];</span><span style="color: #008080;">367</span>                 <span style="color: #0000ff;">for</span>(<span style="color: #800080;">$i</span>=1;<span style="color: #800080;">$i</span>$num1-1);<span style="color: #800080;">$i</span>++<span style="color: #000000;">)</span><span style="color: #008080;">368</span> <span style="color: #000000;">                {</span><span style="color: #008080;">369</span>                     <span style="color: #800080;">$str</span>.=<span style="color: #800080;">$a</span>[<span style="color: #800080;">$i</span><span style="color: #000000;">];</span><span style="color: #008080;">370</span> <span style="color: #000000;">                }</span><span style="color: #008080;">371</span>                 <span style="color: #800080;">$result</span>->r1=<span style="color: #800080;">$re</span><span style="color: #000000;">;</span><span style="color: #008080;">372</span>                 <span style="color: #800080;">$str</span>=<span style="color: #800080;">$str</span>." = "<span style="color: #000000;">;</span><span style="color: #008080;">373</span>         <span style="color: #0000ff;">return</span> <span style="color: #800080;">$str</span><span style="color: #000000;">;</span><span style="color: #008080;">374</span> <span style="color: #000000;">            }</span><span style="color: #008080;">375</span>             <span style="color: #008080;">376</span>             <span style="color: #800080;">$r</span>= <span style="color: #0000ff;">new</span><span style="color: #000000;"> Result();</span><span style="color: #008080;">377</span>             <span style="color: #008080;">378</span>             <span style="color: #008000;">/*</span><span style="color: #008000;"> 两个数的加减法 </span><span style="color: #008000;">*/</span><span style="color: #008080;">379</span>             <span style="color: #0000ff;">if</span>((<span style="color: #800080;">$num1</span>==2)  && (<span style="color: #800080;">$mul</span>=='f') && (<span style="color: #800080;">$div</span>=='f'<span style="color: #000000;">))</span><span style="color: #008080;">380</span> <span style="color: #000000;">            {</span><span style="color: #008080;">381</span>                 <span style="color: #800080;">$question</span> = <span style="color: #008080;">fopen</span>("question.txt", "w"<span style="color: #000000;">);</span><span style="color: #008080;">382</span>                 <span style="color: #800080;">$answer</span>=  <span style="color: #008080;">fopen</span>("answer.txt", "w"<span style="color: #000000;">);</span><span style="color: #008080;">383</span>                 <span style="color: #0000ff;">for</span>(<span style="color: #800080;">$i</span>=0;<span style="color: #800080;">$i</span>$num;<span style="color: #800080;">$i</span>++<span style="color: #000000;">)</span><span style="color: #008080;">384</span> <span style="color: #000000;">                {</span><span style="color: #008080;">385</span>                     <span style="color: #800080;">$j</span>=0<span style="color: #000000;">;</span><span style="color: #008080;">386</span>                     <span style="color: #800080;">$bool</span>=<span style="color: #0000ff;">true</span><span style="color: #000000;">;</span><span style="color: #008080;">387</span>                     <span style="color: #800080;">$b</span>[<span style="color: #800080;">$i</span>]=  addSub(<span style="color: #800080;">$min</span>, <span style="color: #800080;">$max</span>, <span style="color: #800080;">$num1</span>, <span style="color: #800080;">$r</span><span style="color: #000000;">);</span><span style="color: #008080;">388</span>                     <span style="color: #0000ff;">while</span>((<span style="color: #800080;">$r</span>->r1)//<span style="color: #008000;">当结果为负时，重新随机</span><span style="color: #008080;">389</span> <span style="color: #000000;">                    {</span><span style="color: #008080;">390</span>                         <span style="color: #800080;">$b</span>[<span style="color: #800080;">$i</span>]=  addSub(<span style="color: #800080;">$min</span>, <span style="color: #800080;">$max</span>, <span style="color: #800080;">$num1</span>, <span style="color: #800080;">$r</span><span style="color: #000000;">);</span><span style="color: #008080;">391</span> <span style="color: #000000;">                    }</span>