Home > Article > Backend Development > Implement a simple calculator in php

Implement a simple calculator in php

不言Original: 2018-04-03 11:48:268004browse

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
 *
 */

Related recommendations:

How to implement the calculator function in javascript

How to implement a simple calculator in HTML

The above is the detailed content of Implement a simple calculator in php. For more information, please follow other related articles on the PHP Chinese website!

php JavaScript html

Statement：

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Previous article：Detailed process of php version switching and common php-fpm FAQs in online Linux environmentNext article：Detailed process of php version switching and common php-fpm FAQs in online Linux environment

See more

Implement a simple calculator in php

Related articles