A friend function is a function that can access the non-public members of a class even though function itself not a member of the class.
A Friend function is a normal function with special access previlages
- It enhances the efficiency of the program
- It can access non-public members of a class
- It helps to add additional functionality that is not used by class generally
#include <iostream>
using namespace std;
class num{
private:
int a=55,b;
public:
void getnum(){
b = 100;
}
friend int add(num obj);
};
int add(num obj) {
return(obj.a+obj.b);
}
int main() {
num n1;
n1.getnum();
cout<<"sum="<<add(n1)<<endl;
return 0;
}A friend class is a class which can excess private or protected members of other class in which it is declared as friend
class class_Name {
friend return_type function name(argument) {
}
}