# include<iostream.h>
# include<conio.h>
class A
{
 public:
  int a;
  void show()
  {
   a=10;
  }
};
class B : public A
{
 public:
  int b;
  void show1()
  {
   b=20;
  }
};
class C : public B
{
 public:
  void show2()
  {
   cout<<"Sum="<<a+b;
  }
};
void main()
{
 clrscr();
 C obj;
 obj.show();
 obj.show1();
 obj.show2();
 getch();
}# include<iostream.h>
# include<conio.h>
class A
{
 public:
  int a;
  void show()
  {
   a=10;
  }
};
class B : public A
{
 public:
  int b;
  void show1()
  {
   b=20;
  }
};
class C : public B
{
 public:
  void show2()
  {
   cout<<"Sum="<<a+b;
  }
};
void main()
{
 clrscr();
 C obj;
 obj.show();
 obj.show1();
 obj.show2();
 getch();
}