itskingori · December 20, 2013 07:00
diff --git a/exercise10.php b/exercise10.php
 <!DOCTYPE html>
 <html>
 <head>
  <title>Exercise 10: Functions with return values</title>
 </head>
 <body>
  <?php

    // Create 3 functions that do the following ...
    // a) Calculate circumference of a circle ($radius as argument) – call the function ‘circle_circumference’
    // b) Calculate the area of a circle ($radius as argument) – call the function ‘circle_area’
    // c) Calculate the volume of a cylinder ($radius, $height as arguments) – call the function ‘cylinder_volume’

    // Each much have a return and not output the result directly. Call the
    // functions with $radius = 21 and $height = 20 where relevant and output
    // the result.

    // Create constant of PI (π)
    define("PI", 22/7);

    // Create function that calulates circumference of a circle (π x D)
    function circle_circumference($radius) {
      $circumference = PI * ($radius * 2);
      return $circumference;
    };

    // Create function that calculates area of a circle (π x R x R)
    function circle_area($radius) {
      $area = PI * ($radius * $radius);
      return $area;
    };

    // Create function that calculates volume of a cylinder (π x R x R x H)
    function circle_volume($radius, $height) {
      $volume = circle_area($radius) * $height;
      return $volume;
    };

    // Output the calulation result
    echo "The circumference is ".circle_circumference(21)."<br/>";
    echo "The area is ".circle_area(21)."<br/>";
    echo "The volume is ".circle_volume(21, 20);
  ?>
 </body>
 </html>
	<!DOCTYPE html>
	<html>
	<head>
	<title>Exercise 10: Functions with return values</title>
	</head>
	<body>
	<?php

	// Create 3 functions that do the following ...
	// a) Calculate circumference of a circle ($radius as argument) – call the function ‘circle_circumference’
	// b) Calculate the area of a circle ($radius as argument) – call the function ‘circle_area’
	// c) Calculate the volume of a cylinder ($radius, $height as arguments) – call the function ‘cylinder_volume’

	// Each much have a return and not output the result directly. Call the
	// functions with $radius = 21 and $height = 20 where relevant and output
	// the result.

	// Create constant of PI (π)
	define("PI", 22/7);

	// Create function that calulates circumference of a circle (π x D)
	function circle_circumference($radius) {
	$circumference = PI * ($radius * 2);
	return $circumference;
	};

	// Create function that calculates area of a circle (π x R x R)
	function circle_area($radius) {
	$area = PI * ($radius * $radius);
	return $area;
	};

	// Create function that calculates volume of a cylinder (π x R x R x H)
	function circle_volume($radius, $height) {
	$volume = circle_area($radius) * $height;
	return $volume;
	};

	// Output the calulation result
	echo "The circumference is ".circle_circumference(21)."<br/>";
	echo "The area is ".circle_area(21)."<br/>";
	echo "The volume is ".circle_volume(21, 20);
	?>
	</body>
	</html>