Friend function example with surce code in c++,

 Simple Friend function 

#include<iostream>

using namespace std;

class myclass{

int a, b;

public:

friend int add(void);

friend int sub(void);

void setval(){

cout<<" value of a: "; cin>>a;

cout<<"value of b: ";

cin>>b;

}

};

int add(void){

myclass obj;

obj.setval();

int tenp;

//cout<<"A + B = "<<obj. a + obj.b;

tenp =  obj.a + obj. b;

return tenp;

}

int sub(void){

myclass obj ;

obj. setval();

int temp;

temp = obj. a - obj.b;

return temp;

}

int main(){

int result,result2;

result = add();

cout<<result<<endl;

result2 = sub();

cout<<result2;

return 0;

}