Question

Operator Function as Member function and/or Friend Function

Answer 1

Operator Function as Friend Function

An operator overloading function can be a member of class or a friend of class. In case of member function it takes only one argument at time of calling but in case of friend function it takes two arguments as both the objects are passed as argument.

Example

#include<iostream.h> #include<stdio.h> #include<conio.h> class Check { private: float x,y; public: void setData(int a,int b) { x=a; y=b; } void getData() { cout<<"\nx:"<<x<<" y:"<<y; } //Operator overloading function as class member Check operator -(Check c) { Check temp; temp.x=x-c.x; temp.y=y-c.y; return temp; } //Declaring a friend function for operator overloading Check friend operator +(Check,Check); }; //Defining a friend function to overload operator + Check operator +(Check c1,Check c2) { Check temp; temp.x=c1.x+c2.x; temp.y=c1.y+c2.y; return temp; } void main() { clrscr(); Check c1,c2,c3; c1.setData(10,20); c2.setData(20,30); c3=c1+c2; c3.getData(); Check c4=c2-c1; c4.getData(); getch(); }

Output

x:30 y:50 x:10 y:10

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