PHP实现简单计算器

    
    
    
    
        table{
              
             border:1px solid #CC9999;
             width:600px;
              
        }
        th{
            background:#CCCCCC;
        }
        td{
            background:#CCC;
            font:Georgia, "Times New Roman", Times, serif;
             
        }
        .setno{
            color:#FF0000;
        }
        .setyes{
            color:#03F;
        }
    
    
    
    
    
        
             ';
                            $result = 0.0;
                            switch($_POST["opt"]){
                                case '+':
                                    $result = $_POST["num1"] + $_POST["num2"];
                                    break;
                                case '-':
                                    $result = $_POST["num1"] - $_POST["num2"];
                                    break;
                                case '*':
                                    $result = $_POST["num1"] * $_POST["num2"];
                                    break;
                                case '/':
                                    if($_POST["num2"] != "0"){
                                    $result = $_POST["num1"] / $_POST["num2"];
                                    }
                                    break;
                                case '%':
                                    if($_POST["num2"] != "0"){
                                    $result = $_POST["num1"] % $_POST["num2"];
                                    }
                                    break;
                        }
                        if(!$message){
                            echo ''."计算结果:".$_POST["num1"]." ".$_POST["opt"]." ".$_POST["num2"]." = ".$result."";
                        }else{
                            echo '错误:'.$message."";
                             
                        }
                            echo '';
                    }
         
            ?>