**AIM: **

A program to illustrate the use of difference operators to access the class member using friend function

ALGORITHM:

1) Start the process

2) Invoke the classes

3) Call the set_xy() first

a) Assign the value of x and y

b) Print the value of x and y

4) Call the sum() for second(friend)

a) Again assign the temp value of x and y

5) Print the value of x and y

6) Stop the process

**PROGRAM**

#include<iostream.h> class M { int x; int y; public: void set_xy(int a,int b) { x=a; y=b; } friend int sum(M m); }; int sum(M m) { int M ::* px=&M :: x; int M ::* py=&M :: y; M *pm=&m; int s=m.*px + pm->*py; return s; } main() { M n; void (M :: *pf)(int,int)=&M :: set_xy; (n.*pf)(10,20); cout<<"Sum="<<sum(n)<<"\n"; M *op=&n; (op->*pf)(30,40); cout<<"Sum="<<sum(n)<<"\n"; return(0); } |

**Output:**

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Sum=30

Sum=70