Write a program using class and reference variables as arguments of a function to swap the values of a pair of integers.

Source Code :

#include<iostream.h>

class var {

      public:

      void swap(int &a,int &b) {

                  a=a+b;

                  b=a-b;

                  a=a-b;

                  cout<<endl<<"After swapping : ";

                  cout<<endl<<"Value of 'a' :"<<a;

                  cout<<endl<<"Value of 'b' :"<<b;

            }

};

int main() {

      int a,b;

      var ob1;

      cout<<"Value of 'a' :";

      cin>>a;

      cout<<"Value of 'b' :";

      cin>>b;

      ob1.swap(a,b);

      return 0;

}

Output :

Value of ‘a’ : 23

Value of ‘b’ : 45

After swapping :

Value of ‘a’ : 45

Value of ‘b’ : 23