PHP计算器-开关语句问题

时间：2018-06-23 05:20:22

标签： php html calculator

这是我的表格

<form>
        <input type="text" name="num1" placeholder="Digets">
        <input type="text" name="num2" placeholder="Digets">
        <select name="operator">
            <option>Add</option>
            <option>Subtract</option>
            <option>Multiply</option>
            <option>Divide</option>
        </select>
        <button type="submit" value="submit" name="submit">Check for the answer</button>
        <p>Your answer is : </p>
    </form>

<?php 


        if (isset($_GET['$submit'])){
            $result1 = $_GET['$num1'];
            $result2 = $_GET['$num2'];
            $operator = $_GET['$operator'];


            switch ('$operator'){

                case "Add":
                    echo $result1 + $result2;
                break;
                case "Subtract":
                    echo $result1 - $result2;
                break;
                case "Multiply":
                    echo $result1 * $result2;
                break;
                case "Divide":
                    echo $result1 / $result2;
                break;

            }
        }

    ?>

当我单击“计算”按钮时，没有看到答案，我尝试修复所有错误，但在我看来，似乎是开关方面的问题。

6 个答案:

答案 0 :(得分：0)

尝试一下：-

获取值和切换参数时您犯了一些错误。

就像您正在使用值$_GET['$num1']一样，您需要使用$_GET['num1']

因为您只需要传递变量开关（$ operator）而不是引号switch ('$operator')。

  <?php 


            if (isset($_GET['submit'])){
                $result1 = $_GET['num1'];
                $result2 = $_GET['num2'];
                $operator = $_GET['operator'];


                switch ($operator){

                    case 'Add':
                        $FResult =$result1 + $result2;
                        echo "Result:"+ $FResult ;
                        break;
                    case 'Subtract':
                        $FResult =$result1 - $result2;
                        echo "Result:"+ $FResult ;
                        break;
                    case 'Multiply':
                        $FResult =$result1 * $result2;
                        echo "Result:"+ $FResult ;
                        break;
                    case 'Divide':
                        $FResult =$result1 / $result2;
                        echo "Result:"+ $FResult ;
                        break;
                    default :
                         echo "wrong";

                }
            }

        ?>

答案 1 :(得分：0)

<form>
	<input type="number" name="num1" placeholder="Digets">
	<input type="number" name="num2" placeholder="Digets">
	<select name="operator">
		<option value="+">Add</option>
		<option value="-">Subtract</option>
		<option value="*">Multiply</option>
		<option value="/">Divide</option>
	</select>
	<button type="submit" value="submit" name="submit">Check for the answer</button>
	<p>Your answer is : </p>
</form>
<?php 

        if (isset($_REQUEST['submit'])){
            $result1 = $_REQUEST['num1'];
            $result2 = $_REQUEST['num2'];
            $operator = $_REQUEST['operator'];
            
            $res = $result1.$operator.$result2;            
            $p = eval('return '.$res.';');
			print $p;
       }      

?>

<form>
	<input type="number" name="num1" placeholder="Digets">
	<input type="number" name="num2" placeholder="Digets">
	<select name="operator">
		<option>Add</option>
		<option>Subtract</option>
		<option>Multiply</option>
		<option>Divide</option>
	</select>
	<button type="submit" value="submit" name="submit">Check for the answer</button>
	<p>Your answer is : </p>
</form>
<?php 

        if (isset($_REQUEST['submit'])){
            $result1 = $_REQUEST['num1'];
            $result2 = $_REQUEST['num2'];
            $operator = $_REQUEST['operator'];
            switch ($operator){

                case "Add":
                    echo $result1 + $result2;
                break;
                case "Subtract":
                    echo $result1 - $result2;
                break;
                case "Multiply":
                    echo $result1 * $result2;
                break;
                case "Divide":
                    echo $result1 / $result2;
                break;

            }
        }

?>


Another way:

<form>
	<input type="number" name="num1" placeholder="Digets">
	<input type="number" name="num2" placeholder="Digets">
	<select name="operator">
		<option value="+">Add</option>
		<option value="-">Subtract</option>
		<option value="*">Multiply</option>
		<option value="/">Divide</option>
	</select>
	<button type="submit" value="submit" name="submit">Check for the answer</button>
	<p>Your answer is : </p>
</form>
<?php 

        if (isset($_REQUEST['submit'])){
            $result1 = $_REQUEST['num1'];
            $result2 = $_REQUEST['num2'];
            $operator = $_REQUEST['operator'];
            
            $res = $result1.$operator.$result2;            
            $p = eval('return '.$res.';');
			print $p;
       }      

?>

答案 2 :(得分：0)

您犯的错误：

1）。您将变量直接传递到get元素，即应该像$ _GET ['submit']而不是$ _GET ['$ submit'];

2）。您传递的是字符串而不是变量，即switch（'$ operator'）应该是switch（$ operator）

检查出您犯错的地方

<form method="GET" action="">
        <input type="text" name="num1" placeholder="Digets">
        <input type="text" name="num2" placeholder="Digets">
        <select name="operator">
            <option>Add</option>
            <option>Subtract</option>
            <option>Multiply</option>
            <option>Divide</option>
        </select>
        <button type="submit" value="submit" name="submit">Check for the answer</button>
        <p>Your answer is : </p>
    </form>


<?php


        if (isset($_GET['submit'])){
            $result1 = $_GET['num1'];
            $result2 = $_GET['num2'];
            $operator = $_GET['operator'];


            switch ($operator){

                case "Add":
                    echo $result1 + $result2;
                break;
                case "Subtract":
                    echo $result1 - $result2;
                break;
                case "Multiply":
                    echo $result1 * $result2;
                break;
                case "Divide":
                    echo $result1 / $result2;
                break;

            }
        }

    ?>

答案 3 :(得分：0)

您正在寻找PHP解决方案，这是一个：-

<?php

    if (isset($_POST['submit'])){
        $result1 = $_POST['num1'];
        $result2 = $_POST['num2'];
        $operator = $_POST['operator'];


        switch($operator){

            case "Add":
                $res = +$result1 + +$result2;
            break;
            case "Subtract":
                $res = +$result1 - +$result2;
            break;
            case "Multiply":
                $res = +$result1 * +$result2;
            break;
            case "Divide":
                $res = +$result1 / +$result2;
            break;

        }
    }

?>

<form method="post" action="">
    <input type="text" name="num1" id="num1" placeholder="Digets">
    <input type="text" name="num2" id="num2" placeholder="Digets">
    <select name="operator" id="operator">
        <option value="Add">Add</option>
        <option value="Subtract">Subtract</option>
        <option value="Multiply">Multiply</option>
        <option value="Divide">Divide</option>
    </select>
    <input type="submit" name="submit" id="submit" value="Calculate" />
    <p>Your answer is : <input name="res" value="<?php echo $res; ?>"></p>
</form>

这就是您想要的。

答案 4 :(得分：0)

您应该在选择标签（计算器要使用的操作符）<!-- Latest compiled and minified CSS --> <link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.0.3/css/bootstrap.min.css"> <form class="form-horizontal" role="form"> <div class="form-group"> <label for="name" class="col-xs-2 control-label">Name</label> <div class="col-xs-10"> <input type="text" class="form-control" id="name" placeholder="Email"> </div> </div> <div class="form-group"> <label for="inputEmail3" class="col-xs-2 control-label">Email</label> <div class="col-xs-10"> <input type="email" class="form-control" id="inputEmail3" placeholder="Email"> </div> </div> <div class="form-group"> <label for="sex" class="col-xs-2 control-label">Sex</label> <div class="col-xs-10"> <select name="sex" class="auto-width setup-inline form-control input-medium" required> <option value="">---Please select---</option> <option value="m">Male</option> <option value="f">Female</option> </select> </div> </div> <div class="form-group"> <div class="col-sm-offset-2 col-sm-10 text-right"> <button type="submit" class="btn btn-success">Submit</button> </div> </div> </form>中设置选项值。

更改您将<option value="">输入type="text" 

type="number"

答案 5 :(得分：-1)

您要做的是，您正在后端进行计算，并且表单正在刷新页面，但未在页面上的任何位置显示结果。最好与JQuery一起使用，以便无需刷新页面即可立即获得结果。只需检查以下代码：-

<script src="https://code.jquery.com/jquery-1.12.4.js"></script>
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>

<script>
    $(document).ready(function(){
    $("#submit").on('click', function(){
        var num1 = $("#num1").val() ;
        var num2 = $("#num2").val() ;
        var operator = $("#operator").val() ;
        var result = 0 ;

        switch(operator){
            case "Add":
               result = +num1 + +num2 ;
               document.getElementById("res").innerHTML = result ;
               break ;
            case "Subtract":
               result = +num1 - +num2 ;
               document.getElementById("res").innerHTML = result ;
               break ;
            case "Multiply":
               result = +num1 * +num2 ;
               document.getElementById("res").innerHTML = result ;
               break ;
            case "Divide":
               result = +num1 / +num2 ;
               document.getElementById("res").innerHTML = result ;
               break ;
        }
    });
});
</script>

<div>
    <input type="text" name="num1" id="num1" placeholder="Digets">
    <input type="text" name="num2" id="num2" placeholder="Digets">
    <select name="operator" id="operator">
        <option value="Add">Add</option>
        <option value="Subtract">Subtract</option>
        <option value="Multiply">Multiply</option>
        <option value="Divide">Divide</option>
    </select>
    <button name="submit" id="submit">Check for the answer</button>
    <p>Your answer is : <span id="res"></span></p>
</div>

这成功运行。

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