Friend Class A friend class can access private and protected members of other class in which it is declared as friend. It is sometimes useful to allow a particular class to access private members of other class. For example, a LinkedList class may be allowed to access private members of Node.
A friend class can access both private and protected members of the class in which it has been declared as friend.
#include <iostream> using namespace std; class Bestfriend1 { public: int age; private: string purse; public: Bestfriend1 () { age = 14; purse = "pink"; } void demo () { cout << "I am " << age << " years old\n"; cout << "I have " << purse << " purse and I don't share it with anyone except my friend\n"; } friend class Bestfriend2; //bestfriend2 is its friend //it cant do anything except being //a frnd here, as it is declared and defined before its frnd //class }; class Bestfriend2 { public: int age; private: string dress; public: Bestfriend2 () { age = 14; dress = "lilac"; } void show (Bestfriend1 & bf) { cout << "I am " << age << " years old\n"; cout << "I have " << bf.purse << " purse and " << dress << " dress\n"; } friend class Bestfriend1; //it can access members of bestfriend1 }; class Stranger { public: int age; string dress; string purse; Stranger () { age = 14; dress = "purple"; purse = "blue"; } void show () { cout << "I am " << age << " years old\n"; cout << "I have " << purse << " purse and " << dress << " dress\n"; } }; int main () { Bestfriend1 bf1; bf1.demo (); Bestfriend2 bf2; bf2.show (bf1); Stranger s1; s1.show (); return 0; } Object
I am 14 years old I have pink purse and I don't share it with anyone except my friend I am 14 years old I have pink purse and lilac dress I am 14 years old I have blue purse and purple dress 
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