Simple Program for Friend Function Using C++ Programming

Friend Function Definition:

If a function is friend function of a class, that friend function is not the actual member of the class.But which function has rights to access to all private and protected members (variables and functions).

For Better Understanding,

• Understanding Friend Function and Characteristics In C++
• Introduction Of Classes ( OOPS )

Simple Program for Friend Function Algorithm/Steps:

• STEP 1:  Start the program.
• STEP 2:  Declare the class name as Base with data members and member functions.
• STEP 3:  The function get() is used to read the 2 inputs from the user.
• STEP 4:  Declare the friend function mean(base ob) inside the class.
• STEP 5:  Outside the class to define the friend function and do the following.
• STEP 6:  Return the mean value (ob.val1+ob.val2)/2 as a float.
• STEP 7:  Stop the program.

Simple Program for Friend Function

#include<iostream.h>
#include<conio.h>

class base {
    int val1, val2;
public:

    void get() {
        cout << "Enter two values:";
        cin >> val1>>val2;
    }
    friend float mean(base ob);
};

float mean(base ob) {
    return float(ob.val1 + ob.val2) / 2;
}

void main() {
    clrscr();
    base obj;
    obj.get();
    cout << "\n Mean value is : " << mean(obj);
    getch();
}

Sample Output

Enter two values: 10, 20
Mean Value is: 15