PHP how to make the value of the result display in textbox

Shauiosbhaoiu Aousiguosba Published at Dev

Shauiosbhaoiu Aousiguosba

I have 4 radio buttons +, -, *, / and I am planning to do if I select + it will add the result of the two textbox and display it to the 3rd texbox and so if I select - sign it will minus the two texbox and display it to the 3rd textbox and so on. Any help with this would be appreciated. this is the picture

 <html>
    <body>
    <?php
      function add($x,$y){

           $add=$x + $y;
           return $add;

       }
       function subtract($x,$y){

           $subtract=$x - $y;
           return $subtract;

       }
       function multiply($x,$y){

           $multiply=$x * $y;
           return $multiply;

       }
       function divide($x,$y){

           $divide=$x / $y;
           return $divide;

       }

    ?>
    <form action="#" method="post">
    Num1:<input name="num1"><br>
    <input type='radio'  name='express' value='add'>+
    <input type='radio'  name='express' value='subtract'>-
    <input type='radio'  name='express' value='multiply'>*
    <input type='radio'  name='express' value='divide'>/
    <br>
    Num2:<input name="num2"> 
    Result<input value='<?php



    ?>'>
    <input type="submit" name="submit">
    </form>
    <?php


       if(isset($_POST['submit'])){
           $x=$_POST['num1'];
           $y=$_POST['num2'];
           $z=$_POST['express'];
           if($z == 'add'){
               echo add($x,$y);  
           }
           else if($z=='subtract'){
               echo subtract($x,$y);

           }
           else if($z=='multiply'){
               echo multiply($x,$y);

           }
           else{
               echo divide($x,$y);

           }

       }

    ?>
    </body>
    </html>

jayxhj

<html>
<body>
<?php
   $Result = '';

   if(isset($_POST['submit'])){
       $num1    = $_POST['num1'];
       $num2    = $_POST['num2'];
       $express = $_POST['express'];
       switch ($express) {
        case 'add':
           $Result = $num1 + $num2;
           break;

        case 'subtract':
           $Result = $num1 - $num2;
           break;

        case 'multiply':
           $Result = $num1 * $num2;
           break;

        case 'divide':
           if(0 != $num2 ){
            $Result = $num1 / $num2;
          }
          break;

         default:
           break;
       }  

   }

?>
<form action="#" method="post">
Num1:<input name="num1"><br>
<input type='radio'  name='express' value='add'>+
<input type='radio'  name='express' value='subtract'>-
<input type='radio'  name='express' value='multiply'>*
<input type='radio'  name='express' value='divide'>/
<br>
Num2:<input name="num2"> 
Result<input value='<?php echo $Result;?>'>
<input type="submit" name="submit">
</form>
</body>
</html>

I suggest you achieve it by using JavaScript and separate the PHP code from HTML code.

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