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Program to find area of rectangle and circle using interfaces.

CODE:
interface area
{ final int r=3;
final int l=10;
final int b=20;
public void calarea();
}
class circle implements area
{
public void calarea(){System.out.println("Area of circle: "+(3.14*r*r));}
}
class rect implements area
{
public void calarea(){System.out.println("Area of rectangle: "+(l*b));}
}
class EXP19Q1
{
public static void main(String args[])
{
circle c1=new circle();
rect r1=new rect();
c1.calarea();
r1.calarea();
} }

OUTPUT:

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