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PHP容易计算器

WBOY
WBOYOriginal
2016-06-13 11:33:081250browse

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";					}				}			}		?>	
'; } ?>

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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