What is friend function and how we use it in classes?

Question

too much confused about it

Answer 1

friend is a keyword in c++. If you use on any function or class in other class(let say s class).
the function or class with friend keyword can access all member function including private member of class s1.

Answer 2

#include <iostream>
using namespace std;

class MyClass {
public:
int hr;
private:
int regVar;

friend void someFunc(MyClass &obj);
};

void someFunc(MyClass &obj) {
obj.regVar = 42;
cout << obj.regVar;
}
//above you can see someFunc use private member //of class Myclass that is regVar
int main() {
MyClass obj;
someFunc(obj);
}
I have use tutorial example.

Answer 3

any example?

Answer 4

thanku very much