How to access private data in class? – tccicomputercoaching.com

The Friend function and friend class are the techniques used to access the private members of a class by using friend keyword.

A friend function is required when a function needs to access two or more independent classes, internal members.

For example,

#include <iostream.h>

class Distance

{

    private:

        int meter;

    public:

        Distance(): meter(0) { }

        //friend function

        friend int addFive(Distance);

};

// friend function definition

int addFive(Distance d)

{

    //accessing private data from non-member function

    d.meter += 5;

    return d.meter;

}

int main()

{

    Distance D;

    cout<<"Distance: "<< addFive(D);

    return 0;

}

Output

Distance: 5

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