PHP计算器代码

2014-04-23 11:00:52 -0400

代码: 全选: <?php /** * Author: Crazy * http://code.zhangyun.org */ header("Content-Type: text/html; charset=UTF-8"); $submit = isset($_POST['submit']) ? true : false; if ($submit) { $NumA = $_POST['numa']; $NumB = $_POST['numb']; $symbol = $_POST['symbol']; if (!is_numeric($NumA) || !is_numeric($NumB)) echo "<script>alert('请输入正确的数字');</script>"; // 如果是十六进制呢？ // 要不要考虑计算范围？ switch ($symbol) { case '+': $result = $NumA + $NumB; break; case '-': $result = $NumA - $NumB; break; case '*': $result = $NumA * $NumB; break; case '/': $result = $NumA / $NumB; break; default: echo "<script>alert('错误的运算符');</script>"; break; } echo "<script>alert('$result');</script>"; } ?> <html> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <title>计算器</title> </head> <body> <form action="" method="post"> <input type="text" name="numa" value="" /> <select name="symbol"> <option value="+">加</option> <option value="-">减</option> <option value="*">乘</option> <option value="/">除</option> </select> <input type="text" name="numb" value="" /> <input type="submit" name="submit" value="计算" /> </form> </body> </html>