'; if(!$mess) { $sum = 0; switch( $_POST["opt"]) { case "+": $sum = $_POST["num1"] + $_POST["num2"]; break; case "": $sum = $_POST["num1"] $_POST["num2"]; break; case "": $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 ' |
然后在运行时候出现的报错 Notice: Undefined index: num1 in C:\wamp64\www\Caclulator.php on line 50
Notice: Undefined index: num2 in C:\wamp64\www\Caclulator.php on line 66
这类错误,导致不能运行,请教一下怎么解决