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Austin's Pythagorean Theorem Form




Code follows

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Pythagorean Theorem</title>
    <link rel="stylesheet" href="css/styles.css">
</head>
<body>

<div class="page">

    <p class="nav"><a href="../index.php">Home</a></p>

    <?php

    include('includes/header.php');

    // code
    error_reporting(E_ALL);    // set error reporting to all

    echo('<h1>Austin\'s Pythagorean Theorem Form</h1>');

    // Note the variables being passed via the POST ternary operators.

    $step = isset($_POST['step']) ? $_POST['step'] : 0;
    $sideA = isset($_POST['sideA']) ? $_POST['sideA'] : '';
    $sideB = isset($_POST['sideB']) ? $_POST['sideB'] : '';

    // filter all input taken from the Browser
    $step = htmlentities($step);
    $sideA = htmlentities($sideA);
    $sideB = htmlentities($sideB);

    if ($step == 0)    // first time into this form
    {
        ?>

        <form action="pythagorean-theorem.php" method="POST">
            <label for="name">Side A</label>
            <input type="text" size="36" id="sideA" name="sideA" value="">
            <label for="name">Side B</label>
            <input type="text" size="36" id="sideB" name="sideB" value="">
            <br><br>
            <input type="hidden" name="step" value="1">
            <input type="submit" name="submit" value="Submit">
        </form>

        <?php
    } else  // else show what the form gathered
    {

        echo('<p>The following is what the form gathered</p>');
        echo('<pre>');
        print_r($_POST);    // note this dumps the entire contents of the $_POST array
        echo('</pre>');

        $sideASquared = $sideA ** 2;
        $sideBSquared = $sideB ** 2;
        $sides = $sideASquared + $sideBSquared;
        $hypotenuse = sqrt($sides);

        echo("<h3>The Hypotenuse is = $hypotenuse</h3>");

        // provide a form to try again
        ?>

        <form action="pythagorean-theorem.php" method="POST">
            <input type="hidden" name="step" value="0">
            <input type="submit" name="submit" value="Try Again">
        </form>

        <?php
    }

    include('includes/footer.php');
    ?>

    <br>

    <h2>Code follows</h2>

    <div class="code"><?php highlight_file(__FILE__); ?></div>

    <p class="nav nav-foot"><a href="../index.php">Home</a></p>

</div>

</body>
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