3)Derive a class square from class Rectangle. Create one more class circle. Create an interface with only one method called area (). Implement this interface in all the classes. Include appropriate data members and constructors in all classes. Write a program to accept details of a square, circle and rectangle and display the area.
<?php
$a ;
$z;
$pi=3.14;
$r;
$s;
$w;
$l;
$res;
interface i1
{
public function area();
}
class square implements i1
{
public function __construct($n)
{
//$GLOBALS['b'] =
$GLOBALS['a']=$n;
}
public function area ()
{
$GLOBALS['z']=$GLOBALS['a'] * $GLOBALS['a'];
echo "
area of square is:" .$GLOBALS['z'];
}
}
class circle implements i1
{
public function __construct($n)
{
//$GLOBALS['b'] =
$GLOBALS['r']=$n
}
public function area ()
{
$GLOBALS['s']=$GLOBALS['pi']* $GLOBALS['r'];
echo "
area of circle is:" .$GLOBALS['s'];
}
}
class ractangle implements i1
{
public function __construct($a,$b)
{
//$GLOBALS['b'] =
$GLOBALS['w']=$a;
$GLOBALS['l']=$b;
}
public function area ()
{
$GLOBALS['res']=$GLOBALS['w']* $GLOBALS['l'];
echo "
area of circle is:" .$GLOBALS['res'];
}
}
$obj=new square(10);
$obj->area();
$obj=new circle(2);
$obj->area();
$obj=new ractangle(2,3);
$obj->area();
?>
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