php 计算器

<html>
    <head>
        <title>PHP实现简单计算器</title>
        <meta http-equiv="Content-Type" content="text/html;charset=gb2312">
    </head>
<?php
    $num1=true;
    $num2=true;
    $numa=true;
    $numb=true;
    $message="";
    //单路分支
    if(isset($_GET["sub"])){
        if($_GET["num1"]==""){
            $num1=false;
            $message.="第一个数不能为空";

        }
        if(!is_numeric($_GET["num1"])){
            $numa=false;
            $message.="第一个数不是数字";
        }

        if($_GET["num2"]==""){
            $num2=false;
            $message.="第二个数不能为空";

        }
        if(!is_numeric($_GET["num2"])){
            $numb=false;
            $message.="第二个数不是数字";
        }

        if($num1 && $num2 && $numa && $numb) {
            $sum=0;
            //多路分支switch
            switch($_GET["ysf"]){
                case "+":
                    $sum=$_GET["num1"]+$_GET["num2"];
                    break;
                case "-":
                    $sum=$_GET["num1"]-$_GET["num2"];
                    break;
                case "x":
                    $sum=$_GET["num1"]*$_GET["num2"];
                    break;
                case "/":
                    $sum=$_GET["num1"]/$_GET["num2"];
                    break;
                case "%":
                    $sum=$_GET["num1"]%$_GET["num2"];
                    break;
            }
        }
    }
?>
<br /><b>Notice</b>:  Undefined index:  num1 in <b>
D:\\php\\PHPnow1.5.5\\Package\\vhosts\\127.0.0.1\\ceshi\\jsq.php</b> 
on line <b>64</b><br />
    <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 $_GET["num1"] ?>" >
                </td>
                <td>
                    <select name="ysf">
                        <option value="+" <?php if($_GET["ysf"]=="+") echo "selected" ?>>+</option>
                        <option value="-" <?php if($_GET["ysf"]=="-") echo "selected" ?>>-</option>
                        <option value="x" <?php echo $_GET["ysf"]=="x"?"selected":"" ?>>x</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 && $num1 && $numa && $numb){
                        echo "结果：".$_GET["num1"]." ".$_GET["ysf"]." ".$_GET["num2"]." = ".$sum;
                    }else{
                        echo $message;
                    }
                    echo '</td></tr>';
                }
            ?>
            </form>
            </table>

    </body>
</html>
转自:http://1.enjoosite.sinaapp.com/archives/33
posted on 2012-06-04 07:22 端着咖啡码农阅读(1880) 评论(0) 编辑收藏举报