//program for inheritance
#include<iostream.h>
#include<conio.h>
class base
{ public:
  int x;
  int y;
  base(int p,int a)
  { cout<<"\n Base class constructor invoked";
x=p;
y=a;
  }
  ~base()
  { cout<<"\n Base class destructor invoked";
    getch();
  }

};
class derived:public base
{ public:
  int d;
  int e;
  derived(int k,int l,int x,int y):base(x,y)
  { d=k;
e=l;
cout<<"\n Derived class constructor invoked";
cout<<"\n SUM="<<(d+e+x+y);
  }
  ~derived()
  { cout<<"\n Derived class destructor invoked";
    getch();
  }
};
void main()
{ clrscr();
  int f,g,h,i;
  cout<<"\n Enter the value of first integer of base class:";
  cin>>f;
  cout<<"\n Enter the value of second integer of base class:";
  cin>>g;
  cout<<"\n Enter the value of first integer of derived class:";
  cin>>h;
  cout<<"\n Enter the value of second integer of derived class:";
  cin>>i;
  base obj1(f,g);
  derived obj2(h,i,f,g);
  getch();
}