Area of Shapes (Rectangle, Triangle, and Circle) in PHP

Machine Problem in PHP

Create a PHP program that will help the USERS to compute the area of a rectangle, triangle, and circle. Use functions in creating the program. Apply CSS to have an appealing program. Expected outputs: *must have an input box for measurements *the program will ask the user if it's a rectangle, triangle, or circle (use a dropdown list) *displays the correct area *button/s that will compute the area.

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Program Listing

style.css

* { box-sizing: border-box; } body { font-family: Arial, Helvetica, sans-serif; background: #fefefe; color: #1a1a1a; font-size: 15px; } main { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); width: 500px; box-shadow: rgba(99, 99, 99, 0.2) 0px 2px 8px 0px; border-radius: 10px; } .container { display: block; padding: 30px; background: #fff; text-align: left; border-radius: 2px; } h2 { text-align: center; } label { width: 100%; font-size: 20px; } input, select { display: inline-block; background: #f5f5f5; width: 100%; margin: 5px 0 20px 0; padding: 15px; border: none; font-size: 15px; } input:focus, select:focus { background: #eeeeee; outline: none; } button { background: #2196f3; color: #fff; padding: 15px; margin: 0 0 20px; border: none; cursor: pointer; width: 100%; opacity: 0.9; font-size: 15px; outline: none; } .btnSelectShape { background: #f44336; } button:hover { opacity: 1; } .answer { width: 100%; padding: 20px; text-align: center; font-size: 30px; font-weight: bold; background: #dadada; font-family: 'Times New Roman', serif; line-height: 1.5; } .visibility_on { display: block; } .visibility_off { display: none; } .frmAreaSelect { display: flex; flex-flow: row wrap; align-items: center; } .frmAreaSelect select { vertical-align: middle; padding: 15px; margin: 5px 0 0; width: calc(100% - 100px); } .frmAreaSelect button { width: 100px; margin: 5px 0 0; } .pieText { font-family: Serif; }

index.php

<?php /* Area of Shapes (Rectangle, Triangle, and Circle) in PHP Author : Jake Rodriguez Pomperada, MAED-IT, MIT www.jakerpomperada.com and www.jakerpomperada.blogspot.com jakerpomperada@gmail.com Bacolod City, Negros Occidental Philippines */ $area = $html = $infotext = $sel1 = $sel2 = $sel3 = ""; $num1 = isset($_POST['txtNum1']) ? floatval($_POST['txtNum1']) : ""; $num2 = isset($_POST['txtNum2']) ? floatval($_POST['txtNum2']) : ""; $visibility = "visibility_off"; $frmArea = isset($_GET['selectArea']) ? $_GET['selectArea'] : ''; // Display selected shape input fields if(isset($_GET['selectArea'])) { $visibility = "visibility_on"; switch ($frmArea) { case "Rectangle": $sel1 = "selected"; $html = '<h2>Area of a Rectangle ( l x w )</h2> <label for="txtNum1"><b>Length (l):</b></label> <input type="number" step=".0001" name="txtNum1" id="txtNum1" value="'.$num1.'" required> <label for="txtNum2"><b>Width (w):</b></label> <input type="number" step=".0001" name="txtNum2" id="txtNum2" value="'.$num2.'" required>'; if(isset($_POST['btnCalculate'])) { $area = round($num1 * $num2); $infotext = '<div class="answer">'.$num1." x ".$num2." = ".$area."</div>"; } break; case "Triangle": $sel2 = "selected"; $html = '<h2>Area of a Triangle ( ^bh&frasl;₂ )</h2> <label for="txtNum1"><b>Base (b):</b></label> <input type="number" step=".0001" name="txtNum1" id="txtNum1" value="'.$num1.'" required> <label for="txtNum2"><b>Height (h):</b></label> <input type="number" step=".0001" name="txtNum2" id="txtNum2" value="'.$num2.'" required>'; if(isset($_POST['btnCalculate'])) { $area = round(($num1 * $num2)/2); $infotext = '<div class="answer">^{('.$num1." x ".$num2.")}&frasl;₂ = ".$area."</div>"; } break; case "Circle": $sel3 = "selected"; $html = '<h2>Area of a Circle ( <span class="pieText">π</span>r² )</h2> <label for="txtNum1"><b>Radius (r):</b></label> <input type="number" step=".0001" name="txtNum1" id="txtNum1" value="'.$num1.'" required>'; if(isset($_POST['btnCalculate'])) { $area = round((pi() * pow($num1, 2)), 4); $infotext = '<div class="answer"><span class="pieText">π</span>('.$num1.')² = '.$area.'</div>'; } break; } } ?> <!DOCTYPE html> <html lang="en"> <head> <meta name="viewport" content="width=device-width, initial-scale=1"> <title>Area of Shapes (Rectangle, Triangle, and Circle) in PHP</title> <link rel="stylesheet" href="style.css"> </head> <body> <h3 align="center"> Area of Shapes (Rectangle, Triangle, and Circle) in PHP </h3> <main> <div class="container"> <form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="get" class="frmAreaSelect"> <label for="selectArea"><b>Select Shape:</b></label> <select name="selectArea" id="selectArea" value="<?php echo $oper; ?>" required> <option value="Rectangle" <?php echo $sel1; ?>>Rectangle</option> <option value="Triangle" <?php echo $sel2; ?>>Triangle</option> <option value="Circle" <?php echo $sel3; ?>>Circle</option> </select> <button type="submit" class="btnSelectShape">Select</button> </form> </div> <div class="container <?php echo $visibility; ?>"> <form action="" method="post" class="frmAreaCalculate"> <?php echo $html; ?> <button type="submit" name="btnCalculate" class="btnCalculate">Calculate Area</button> <?php echo $infotext; ?> </form> </div> </main> </body> </html>