Write a C++ program to Operator Overloading Using a Friend Function.

A feature of some programming languages in which the same 0PERATORmay be used on different data types with different, but analogous, results. For example most languages permit the same operator + to add either INTEGER or FLOATING-POINT numbers, and many further allow it to be used to CONCATENATE strings, so that ‘rag’ + ‘mop’ produces ‘ragmop’. A few languages, including C++, allow the programmer to create new operator overloading.

#include <iostream.h> 
 #include<conio.h> 
 class Values 
 { 
       int a,b; 
       public: 
      Values(){} 
                   Values(int aa,int bb) 
                { 
                       a=aa; 
                       b=bb; 
                } 
                    void show() 
                { 
                    cout <<a<<" "; 
                    cout <<b<<"\n"; 
                 } 
                    friend Values operator+(Values p1 ,Values p2); //friend 
                    Values operator-(Values p2); 
                    Values operator=(Values p2); 
                    Values operator++(); 
 }; 
  //Now,+is overloaded using friend function. 
              Values operator+(Values p1 ,Values p2) 
          { 
                Values temp; 
                temp.a =p1.a +p2.a; 
                temp.b =p1.b +p2.b; 
                return temp; 
          } 
               Values Values::operator-(Values p2) 
          { 
               Values temp; 
                temp.a =a +p2.b; 
                temp.b =a +p2.b; 
                return temp; 
           } 
               Values Values::operator=(Values p2) 
          { 
                a =p2.a; 
                b =p2.a; 
                return *this; 
           } 
               Values Values::operator++() 
          { 
               a++; 
               b++; 
               return *this; 
           } 
               void main() 
           { 
                clrscr(); 
                Values v1 (20,30),v2(15,40); 
                v1.show(); 
                v2.show(); 
                ++v1; 
                v1.show(); 
                v2 =++v1 ; 
                v1.show(); 
                v2.show(); 
                v1=v2; 
                v1.show(); 
                v2.show(); 
                getch(); 
          }