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PHP容易计算器

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Release： 2016-06-13 12:36:34
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PHP简单计算器

这个是运用PHP的条件控制语句写的，比较简单，消化下...

	
		<title>PHP实现简单计算器（使用分支结构）</title>
	
	
		<?php $mess = "";
			if( isset( $_POST["sub"])){
				if( $_POST["num1"] == ""){
					$mess .= "第一个数不能为空！<br>";
				}
				else if( !is_numeric($_POST["num1"])){
					$mess .= "第一个数必须为数字！<br>";
				}
			
				if( $_POST["num2"] == ""){
					$mess .= "第二个数不能为空！<br>";
				}
				else{
					if( !is_numeric($_POST["num2"])){
						$mess .= "第二个数必须为数字！<br>";
					}
					else if( $_POST["opt"] == "/" && $_POST["num2"] == 0){
						$mess .= "除数不能为0";
					}
				}
			}
		?>
Copy after login
'; } ?>

计算器
" /> " />
'; if( !$mess){ $sum = 0; switch($_POST["opt"]){ case "+": $sum = $_POST["num1"] + $_POST["num2"];break; case "-": $sum = $_POST["num1"] - $_POST["num2"];break; case "x": $sum = $_POST["num1"] * $_POST["num2"];break; case "/": $sum = $_POST["num1"] / $_POST["num2"];break; case "%": $sum = $_POST["num1"] % $_POST["num2"];break; } echo "结果: {$_POST['num1']} {$_POST['opt']} {$_POST['num2']} = {$sum}"; } else{ echo $mess; } echo '



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