jkuip · September 18, 2015 15:18 · ghost · Jan 9, 2018 · GMD12 · Aug 10, 2018
diff --git a/calculator.php b/calculator.php
 <!DOCTYPE html>
 <html>
 	<head>
 		<title>Calculator</title>
 		<meta charset="utf-8">
 		<meta http-equiv="X-UA-Compatible" content="IE=edge">
 		<meta name="viewport" content="width=device-width, initial-scale=1">
 		 
 		<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet">
 	</head>
 	<body>
 		
 		<div class="container" style="margin-top: 50px">
 		
 			<?php
 			
 				// If the submit button has been pressed
 				if(isset($_POST['submit']))
 				{
 					// Check number values
 					if(is_numeric($_POST['number1']) && is_numeric($_POST['number2']))
 					{
 						// Calculate total
 						if($_POST['operation'] == 'plus')
 						{
 							$total = $_POST['number1'] + $_POST['number2'];	
 						}
 						if($_POST['operation'] == 'minus')
 						{
 							$total = $_POST['number1'] - $_POST['number2'];	
 						}
 						if($_POST['operation'] == 'times')
 						{
 							$total = $_POST['number1'] * $_POST['number2'];	
 						}
 						if($_POST['operation'] == 'divided by')
 						{
 							$total = $_POST['number1'] / $_POST['number2'];	
 						}
 						
 						// Print total to the browser
 						echo "<h1>{$_POST['number1']} {$_POST['operation']} {$_POST['number2']} equals {$total}</h1>";
 					
 					} else {
 						
 						// Print error message to the browser
 						echo 'Numeric values are required';
 					
 					}
 				}
 			
 			?>
 		    
 		    <!-- Calculator form -->
 		    <form method="post" action="calculator.php">
 		        <input name="number1" type="text" class="form-control" style="width: 150px; display: inline" />
 		        <select name="operation">
 		        	<option value="plus">Plus</option>
 		            <option value="minus">Minus</option>
 		            <option value="times">Times</option>
 		            <option value="divided by">Divided By</option>
 		        </select>
 		        <input name="number2" type="text" class="form-control" style="width: 150px; display: inline" />
 		        <input name="submit" type="submit" value="Calculate" class="btn btn-primary" />
 		    </form>
 	    
 		</div>
 	
 	</body>
 </html>
	<!DOCTYPE html>
	<html>
	<head>
	<title>Calculator</title>
	<meta charset="utf-8">
	<meta http-equiv="X-UA-Compatible" content="IE=edge">
	<meta name="viewport" content="width=device-width, initial-scale=1">

	<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet">
	</head>
	<body>

	<div class="container" style="margin-top: 50px">

	<?php

	// If the submit button has been pressed
	if(isset($_POST['submit']))
	{
	// Check number values
	if(is_numeric($_POST['number1']) && is_numeric($_POST['number2']))
	{
	// Calculate total
	if($_POST['operation'] == 'plus')
	{
	$total = $_POST['number1'] + $_POST['number2'];
	}
	if($_POST['operation'] == 'minus')
	{
	$total = $_POST['number1'] - $_POST['number2'];
	}
	if($_POST['operation'] == 'times')
	{
	$total = $_POST['number1'] * $_POST['number2'];
	}
	if($_POST['operation'] == 'divided by')
	{
	$total = $_POST['number1'] / $_POST['number2'];
	}

	// Print total to the browser
	echo "<h1>{$_POST['number1']} {$_POST['operation']} {$_POST['number2']} equals {$total}</h1>";

	} else {

	// Print error message to the browser
	echo 'Numeric values are required';

	}
	}

	?>

	<!-- Calculator form -->
	<form method="post" action="calculator.php">
	<input name="number1" type="text" class="form-control" style="width: 150px; display: inline" />
	<select name="operation">
	<option value="plus">Plus</option>
	<option value="minus">Minus</option>
	<option value="times">Times</option>
	<option value="divided by">Divided By</option>
	</select>
	<input name="number2" type="text" class="form-control" style="width: 150px; display: inline" />
	<input name="submit" type="submit" value="Calculate" class="btn btn-primary" />
	</form>

	</div>

	</body>
	</html>