php简单计算器

最新推荐文章于 2022-04-14 16:03:26 发布

原创最新推荐文章于 2022-04-14 16:03:26 发布 · 1.3k 阅读

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>计算器</title>
</head>
<body>
    <?php
        @$a = $_GET['a'];                      //get接收a
        @$b = $_GET['b'];                      //get接收b
        @$operation = $_GET['operation'];      //get接收运算符号
        $sum = 0;                              //结果初始化为0
        switch ($operation){                  //switch选择运算方法
            case '+':
                $sum = $a+$b;
                break;
            case '-':
                $sum = $a-$b;
                break;
            case'*':
                $sum = $a*$b;
                break;
            case '/':
                if ($b==0){
                    echo "除数不能为0";
                    break;
                }
                $sum = $a/$b;
                break;
        }
    ?>
<form action="reckon.php" method="get">
    <input type="number" name="a" value="<?php echo $a?>">
    <select name="operation">
        <option value="+" <?php if ($operation=='+'){echo 'selected="selected"';}?>>+</option>
        <option value="-" <?php if ($operation=='-'){echo 'selected="selected"';}?>>-</option>
        <option value="*" <?php if ($operation=='*'){echo 'selected="selected"';}?>>*</option>
        <option value="/" <?php if ($operation=='/'){echo 'selected="selected"';}?>>/</option>
    </select>
    <input type="number" name="b" value="<?php echo $b?>">
    <input type="submit" value="=">
    <input type="number" name="sum" value="<?php echo $sum?>">
</form>
</body>
</html>

运行截图