Hierarchical inheritance

class Base

{

 int a=10, b=5, c;

 void add()

 {

 c=a+b;

 System.out.println("c="+c);

 }

}

class Derived1 extends Base

{

 void sub()

 {

 c=a-b;

 System.out.println("c="+c);

 }

}

class Derived2 extends Base

{

 void multiply()

 {

 c=a*b;

 System.out.println("c="+c);

 }

}

class HI

{

 public static void main(String args[])

 {

 Derived1 obj1=new Derived1();

 obj1.add();

 obj1.sub();

 Derived2 obj2=new Derived2();

 obj2.add();

 obj2.multiply();

 }

}