#include<iostream.h> #include<conio.h> class data2; class data1 { int a,b; public: void get1(); friend void sum(data1,data2); }; class data2 { int c,d; public: void get2(); friend void sum(data1,data2); }; void sum(data1 a1,data2 a2) { cout<<a1.a+a2.c<<endl; cout<<a1.b+a2.d<<endl; } main() { data1 a; data2 b; a.get1(); b.get2(); sum(a,b); } void data1::get1() { cout<<\"Enter value for a: \"; cin>>a; cout<<\"Enter value for b: \"; cin>>b; } void data2::get2() { cout<<\"Enter value for c: \"; cin>>c; cout<<\"Enter value for d: \"; cin>>d; }