Create an abstract class Shape with methods calc_area( ) and calc_volume( ). Derive three classes Sphere(radius) , Cone(radius, height) and Cylinder(radius, height), Calculate area and volume of all. (Use Method overriding).

By April 01, 2016
Shape.html
<html>
<body>
<form action="shape.php" method=get>
<center><h2>Enter values for Cone & Cylinder</h2>
<p>Enter Radius </td><td><input type="text" name="r"><br>
<p>Enter Height</td><td> <input type="text" name="h"><br>
<p><input type="submit" value="calculate">
</form>
</body>
</html>
Shape.php
<?php
define('pi',3.14);
abstract class shape
{
 abstract function calc_area($r,$h);
 abstract function calc_vol($r,$h);
}
class sphere extends shape
{
  function calc_area($r,$r)
  {
              return 4*pi*$r*$r;       
  }

  function calc_vol($r,$r)
  {
              return (4/3)*pi*$r*$r*$r;
  }
}

class cylinder extends shape
{
  function calc_area($r,$h)
  {
              return 2*pi*$r*($r+$h);          
  }

  function calc_vol($r,$h)
  {
              return pi*$r*$r*$h;
  }
}

class cone extends shape
{
  function calc_area($r,$h)
  {
              return 0.5*$r*$r*$h;   
  }

  function calc_vol($r,$h)
  {
              return $r*$r*$r*$h;
  }
}
$r=$_GET['r'];
$h=$_GET['h'];
$ob=new cone();
echo "Area of cone ".$ob->calc_area($r,$h);
echo "</br>";
echo "Volume of cone ".$ob->calc_vol($r,$h);
echo "</br>";
$ob=new cylinder();
echo "Area of cylinder ".$ob->calc_area($r,$h);
echo "</br>";
echo "Volume of cylinder".$ob->calc_vol($r,$h);
echo "</br>";

$ob=new sphere();
echo "Area of sphere ".$ob->calc_area($r,$r);
echo "</br>";
echo "Volume of sphere ".$ob->calc_vol($r,$r);

?>



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