# include<iostream.h>
# include<conio.h>
class A
{
 public:
  int a;
  void show()
  {
         a=10;
         cout<<"A="<<a;
  }
};
class B :public A
{
 public:
  int b;
  void show1()
  {
   b=20;
   cout<<"B="<<b;
  }
};
class C : public A
{
 public:
  int c;
  void show2()
  {
   c=30;
   cout<<"C="<<c;
  }
};
void main()
{
 clrscr();
 B obj;
 C obj1;
 obj.show();
 obj.show1();
 obj1.show2();
 getch();
}