php代码
<html>
<head>
<title>
PHP实现简单计算器
</title>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
</head>
<?php
if(isset($_GET["sub"])){
$sum=0;
$num1=true;
$num2=true;
$numa=true;
$numb=true;
$message="";
if($_GET["num1"]==""){
$num1=false;
$message="第一个参数为空";
}
if($_GET["num2"]==""){
$num2=false;
$message="第二个参数为空";
}
if(!is_numeric($_GET["num1"])){
$numa=false;
$message.="第一个参数不是数字!";
}
if(!is_numeric($_GET["num2"])){
$numb=false;
$message.="第二个参数不是数字!";
}
if($num1 && $num2 && $numa){
switch($_GET["ysf"]){
case "+":$sum=$_GET["num1"]+$_GET["num2"];
break;
case "-":$sum=$_GET["num1"]-$_GET["num2"];
break;
case "*":$sum=$_GET["num1"]*$_GET["num2"];
break;
case "/":$sum=$_GET["num1"]/$_GET["num2"];
break;
case "%":$sum=$_GET["num1"]%$_GET["num2"];
break;
}
}
}
?>
<body>
<table align="center" border="1" width="500">
<caption><h1>计算器</h1></caption>
<form action="jsq.php">
<tr>
<td>
<input type="text" size="5" name="num1" value="<?php echo $_GET["num1"]?>">
</td>
<td>
<select name="ysf">
<option value="+" <?php echo $_GET["ysf"]=="+"? "selected":""?>>+</option>
<option value="-" <?php echo $_GET["ysf"]=="-"? "selected":""?>>-</option>
<option value="*" <?php echo $_GET["ysf"]=="*"? "selected":""?>>*</option>
<option value="/" <?php echo $_GET["ysf"]=="/"? "selected":""?>>/</option>
<option value="%" <?php echo $_GET["ysf"]=="%"? "selected":""?>>%</option>
</select>
</td>
<td>
<input type="text" size="5" name="num2" value="<?php echo $_GET["num2"]?>">
</td>
<td>
<input type="submit" name="sub" value="计算">
</td>
</tr>
<?php
if(isset($_GET["sub"])){
echo '<tr><td colspan="5">';
if($num1 && $num2 && $numa&& $numb){
echo "结果是:".$_GET["num1"]." ".$_GET["ysf"]." ".$_GET["num2"]." = ".$sum;
}else{
echo $message;
}
echo '</td></tr>';
}
?>
</form>
</table>
</body>
</html>
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