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Implement a simple calculator in php

不言Original: 2018-04-03 11:48:267972browse

This article introduces the code to implement a simple calculator using PHP. I share it with you here and give it to friends in need. Let’s take a look together.

<html>
<head>
    <title>PHP实现简单的计算器</title>
    <meata http-equiv="Content-Type" content="text/html;charset=utf-8"></meata>
</head>
<?php
    $num1=true;
    $num2=true;
    $numa=true;
    $numb=true;
    $message="";
    //单路分支
    if(isset($_GET["sub"])){
        if($_GET["num1"]==""){
            $num1=false;
            $message.="第一个数字不能为空";
        }
        if(!is_numeric($_GET["num1"])){
            $numa=false;
            $message.="第一个不是数字";
        }
        if($_GET["num2"]==""){
            $num2=false;
            $message.="第二个不能为空";
        }
        if(!is_numeric($_GET["num2"])){
            $numb=false;
            $message.="第二个不是数字";
        }
        if($num1 && $num2 && $numa && $numb){
            $sum=0;
            //多路分支swith
            switch($_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;
            }
        }
    }

?>
<body>
<table align="center" border="1" sidth="500">
    <caption><h1>计算器</h1></caption>
    <form action="test.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($_GET["sub"])){
                echo &#39;<tr><TD colspan="5">&#39;;
                if($num1 && $num2 && $numa && $numb){
                    echo "结果：".$_GET["num1"]." ".$_GET["ysf"]." ".$_GET["num2"]." = ".$sum;
                }else{
                    echo $message;
                }
                echo &#39;</td></tr>&#39;;
            }
        ?>
    </form>
</table>
</body>
</html>


/**
 * Created by PhpStorm.
 * User: user
 * Date: 2018/3/27
 * Time: 16:26
 *
 */

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