简单计算器

PHP中文网Original: 2016-05-23 08:39:361197browse

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 &#39;<tr><td colspan="5">&#39;;
                    if($num1 && $num2 && $numa&& $numb){
                        echo "结果是:".$_GET["num1"]." ".$_GET["ysf"]." ".$_GET["num2"]." = ".$sum;
                    }else{
                        echo $message;
                    }

                    echo &#39;</td></tr>&#39;;
                }
                ?>
                </form>
            </table>
        </body>
</html>

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