why this simple calculator doesn't yield any output? [closed]-CodePudding


<body>
<form>
  <input type="text" name="input1" placeholder="number 1" >
  <input type="text" name="input2" placeholder="number 2" >
  <select name="operator">
      <option>none</option>
      <option>add</option>
      <option>subtract</option>
      <option>multiply</option>
      <option>divide</option>
  </select>
<br>
  <button type="submit" name="submit" value="submit">calculate</button>
</form>
<p>the answer is:</p>
<?php
//if this is been set already(the button is hit)
if(isset($_GET['submit'])) 
{
  $result1 = $_GET['input1'];
  $result2 = $_GET['input2'];
  $operator= $_GET['operator'];
  switch($operator){
  case "none":
          echo "Error";
   break;
  case "add":
          echo $result1   $result2;
   break;
  case "subtract":
          echo $result1 - $result2;
   break;
  case "multiply":
          echo $result1 * $result2;
   break;
  case "divide":
          echo $result1 / $result2;
   break;
  }
}

?>
</body>

why the above section of code doesn't create any output? I would appreciate it sb explained it to me what the code above lacks or what change is required for the black of code to execute correctly

CodePudding user response：

Try moving your PHP Code above the html tags.

<?php
$answer = 0;
 //if this is been set already(the button is hit)
if(isset($_GET['submit'])) 
{
  $result1 = $_GET['input1'];
  $result2 = $_GET['input2'];
  $operator= $_GET['operator'];
  switch($operator){
  case "none":
          $answer = null;
   break;
  case "add":
          $answer = $result1   $result2;
   break;
  case "subtract":
          $answer = $result1 - $result2;
   break;
  case "multiply":
          $answer = $result1 * $result2;
   break;
  case "divide":
          $answer = $result1 / $result2;
   break;
  }
}
?>
<body>
<form action=''>
<input type="text" name="input1" placeholder="number 1" >
<input type="text" name="input2" placeholder="number 2" >
<select name="operator">
  <option>none</option>
  <option>add</option>
  <option>subtract</option>
  <option>multiply</option>
  <option>divide</option>
</select>
<br />
<button type="submit" name="submit" value="submit">calculate</button>
</form>
<p>the answer is: <?= $answer ?></p>
</body>

This should do.

CodePudding user response：

I must have typed "localhost" inside ny browser!