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<html>

  <head>
      <meta charset="utf-8">
      <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
      <title>계산기</title>
      <meta name="description" content="">
      <meta name="viewport" content="width=device-width">
  </head>
  <body>
      <form method="post">
          <input type="text" name="id" id="id"/>
          <select name="by_" id="by_">
          <option>+</option>
          <option>-</option>
          <option>/</option>
          <option>*</option>
          </select>
          <input type="text" name="id2" id="id2"/>
          <input type="submit" value="계산하기">
      </form>
  </body>

</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> </PHP>

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