friend function (c++) with example.

A friend function, that is a "friend" of a given class, is a function that is given the same access as methods to private and protected data. A friend function is declared by the class that is granting access, so friend functions are part of the class interface, like methods.

example of friend function:-

#include <iostream>
using namespace std;

class A{
   
    private:
        int a;
        public:
            void disp(int x){
                a=x;
                cout<<a<<endl;
            }
   
    friend int modify(A);
       
};
int modify(A aObj){
   
    aObj.a=aObj.a+7;
     return aObj.a;
}
int main(){
    A obj;
    obj.disp(5);
   
    cout<<modify(obj);
    }