1.      Program to find the maximum of two numbers using a friend function.

1. #include <iostream.h>

2. #include<conio.h>

3. class Num {

4. private:

5.     int num;

6.  

7. public:

8.     Num(int n) {

9.         num = n;

10.     }

11.  

12.     friend int max(Num n1, Num n2);

13. };

14.  

15. int max(Num n1, Num n2) {

16.     return n1.num > n2.num ? n1.num : n2.num;

17. }

18.  

19. int main() {

20.     Num n1(10), n2(20);

21.  

22.     int maxNum = max(n1, n2);

23.  

24.     cout << "Maximum number: " << maxNum << endl;

25.     getch();

26.     return 0;

28. }