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Editorial Team
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Asked: 2026-06-05T06:26:12+00:00

When I input numeric value in Number 1 and Number 2, and press Add.

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When I input numeric value in Number 1 and Number 2, and press “Add”. It does not display the total added value. Please see my coding below. and advice me, what to is the problem, and what can be done.

<html>
<head>
<title>Simple Calculator</title>
<?php
    if(isset($_POST['submitted'])){
        if(is_numeric($_POST['number1']) && is_numeric($_POST['number2'])){
        $add = ($_POST['number1'] + $_POST['number2']);
            echo "Add: ".$_POST['number1']."+".$_POST['number2']."=";
            }
        }



?>
<script type="text/javascript">


</script>
</head>

<body>
<h1>Simple Calculator</h1>
<form action="simple_calculator.php" method="post">
<p>Number 1: <input type="text" name="number1" size="20" value="<?php if(isset($_POST['number1'])) echo $_POST['number1'];?>"/></p>
<p>Number 2: <input type="text" name="number2" size="20" value="<?php if(isset($_POST['number2'])) echo $_POST['number2'];?>"/></p>

          <input type="button" name="add" value="Add" />
          <input type="button" name="minus" value="Minus" />
          <input type="button" name="multiply" value="Multiply" />
          <input type="button" name="divide" value="Divide" />
          <input type="reset" name="rest" value="Reset" />
          <input type="hidden" name="submitted" value="TRUE" />


</form>

</body>
</html>
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1 Answer

  1. Editorial Team
    1. You are echoing the result data into the <head>, so it will not be displayed.
    2. You forgot to echo $add.
    3. Your <input>s are of type button and not submit, so the form will not be submitted to the server.
    4. Because you are echoing the previously entered values into the form, <input type="reset"> will probably not do what you want/expect it to do. I think it would be better to implement this as another submit.
    5. Because this form affects only what the next page displays and does not make a permanent change to the server, you should use the GET method and not POST.

    Try this:

    <html>
  <head>
    <title>Simple Calculator</title>
    <script type="text/javascript"></script>
  </head>
  <body>
    <h1>Simple Calculator</h1>
    <form action="simple_calculator.php" method="get">
      <p>Number 1: <input type="text" name="number1" size="20" value="<?php if (isset($_GET['number1']) && !isset($_GET['reset'])) echo $_GET['number1'];?>"/></p>
      <p>Number 2: <input type="text" name="number2" size="20" value="<?php if (isset($_GET['number2']) && !isset($_GET['reset'])) echo $_GET['number2'];?>"/></p>
      <input type="submit" name="add" value="Add" />
      <input type="submit" name="minus" value="Minus" />
      <input type="submit" name="multiply" value="Multiply" />
      <input type="submit" name="divide" value="Divide" />
      <input type="submit" name="reset" value="Reset" />
      <input type="hidden" name="submitted" value="1" />
    </form>
    <?php

        if (isset($_GET['submitted']) && !isset($_GET['reset'])) {

            echo "<div>";

            if (is_numeric($_GET['number1']) && is_numeric($_GET['number2'])) {

                if (isset($_GET['add'])) {

                    $result = $_GET['number1'] + $_GET['number2'];
                    echo "Add: ".$_GET['number1']." + ".$_GET['number2']." = ".$result;

                } else if (isset($_GET['minus'])) {

                    $result = $_GET['number1'] - $_GET['number2'];
                    echo "Minus: ".$_GET['number1']." - ".$_GET['number2']." = ".$result;

                } else if (isset($_GET['multiply'])) {

                    $result = $_GET['number1'] * $_GET['number2'];
                    echo "Multiply: ".$_GET['number1']." * ".$_GET['number2']." = ".$result;

                } else if (isset($_GET['divide'])) {

                    $result = $_GET['number1'] / $_GET['number2'];
                    echo "Divide: ".$_GET['number1']." / ".$_GET['number2']." = ".$result;

                }

            } else {

                echo "Invalid input";

            }

            echo "</div>";

        }

    ?>
  </body>
</html>
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