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- 2. FRIEND FUNCTIONS Friend functions of an object can "see" inside the object and access private member functions and data. To declare a function as a friend of a class, precede the function prototype in the class definition with the keyword friend.
- 3. WHEN NEEDED?
- 5. class rectangle { friend void set_value(rectangle&, float); // friend declaration private: float height; float width; int xpos; int ypos; public: rectangle(float, float); // constructor void draw(); // draw member function void posn(int, int); // position member function void move(int, int); // move member function float get_height(); // access function void set_height(float); // access function };
- 6. void set_value(rectangle &rc, float h) { rc.height = h; } void main() { rectangle rc(1.0, 3.0); set_value(rc, 10.0); }
- 11. FRIEND FUNCTION PROGRAM EXERCISE ï‚¡ Write a class complex that has two private attributes one for storing real part and other for imaginary part. SetNumber function to set the real part and imaginary part. PrintNumber function to display them on screen. ï‚¡ Write a function to calculate Sum of two complex numbers(Hint: use friend function ) 2 + 3i 3 + 7i -------------- 5 + 10i
- 12. FRIEND CLASS PROGRAM EXERCISE ï‚¡ Modify the program you have written for last exercise. Introduce a class calculator that adds real part of complex number in a function and return int. Similar function for sum of imaginary part. Make the class friend of class complex.