Question

我制作了一个计算器，但只有一个加法操作正在运行。

这是代码

            <form>
            <input type = "text" name = "num1"/>
            <input type = "text" name = "num2"/>
            <select name = "opr">
            <option>Add</option>
            <option>MULTIPLY</option>
            <option>SUBTRACT</option>
            <option>DIVIDE</option>
            </select>
            <br>
            <button type ="submit" name ="submit" value = "submit">submit</button>
            </form>
            <?php
            if(isset($_GET['submit']))
            {
            $num1 = $_GET["num1"];
            $num2 = $_GET["num2"];
            $opr =  $_GET["opr"];

            if($opr = "ADD")
            {
                $num3 = $num1+$num2;
                echo $num3;
            }
            elseif($opr = "MULTIPLY" )
            {
                $num3 = $num1*$num2;
                echo $num3;
            }
            elseif($opr = "SUBTRACT" )
            {
                $num3 = $num1-$num2;
                echo $num3;
            }
            else{
                $num3 = $num1/$num2;
                echo $num3;
            }
            }

            ?>

我也为其他操作做了条件声明，但现在确定它为什么不起作用。我试图使用$ _GET函数从URL获取值。但只有ADD方法才有效。

Answer 1

您正在使用=代替==来检查条件。我已经更新了你的代码。请找到如下。

<form>
            <input type = "text" name = "num1"/>
            <input type = "text" name = "num2"/>
            <select name = "opr">
            <option>ADD</option>
            <option>MULTIPLY</option>
            <option>SUBTRACT</option>
            <option>DIVIDE</option>
            </select>
            <br>
            <button type ="submit" name ="submit" value = "submit">submit</button>
            </form>
            <?php
            if(isset($_GET['submit']))
            {
            $num1 = $_GET["num1"];
            $num2 = $_GET["num2"];
            $opr =  $_GET["opr"];

            if($opr == "ADD")
            {
                $num3 = $num1+$num2;
                echo $num3;
            }
            elseif($opr == "MULTIPLY" )
            {
                $num3 = $num1*$num2;
                echo $num3;
            }
            elseif($opr == "SUBTRACT" )
            {
                $num3 = $num1-$num2;
                echo $num3;
            }
            else{
                $num3 = $num1/$num2;
                echo $num3;
            }
            }

            ?>

计算不起作用

1 个答案: