C++ program to exchange values of two variables (Swapping) using pointer. This program uses a function called exchange(int*,int*) that takes two argument as integer pointers. The variables are passed by reference method and hence, the swapping done at the exchange function will reflect in the main method also.
#include<iostream>
#include<conio.h>
using namespace std;
void exchange(int*, int*);
void main()
{Â Â Â
        int x,y;
        cout<<“Enter x :”;
        cin>>x;
        cout<<“nEnter y:”;
        cin>>y;
        cout<<“Before Exchange : x = “<<x<<” y = “<<y<<“nn”;
        exchange(&x,&y); //Calling Exhcange function to swap
        cout<<“After Exchange : x = “<<x<<” y = “<<y<<“nn”;
        getch();
}
//No need to return any values since the variables are already affected.
void exchange(int *a, int *b)
{
        int t;
        t = *a;  //Saving data in first variable to an intermediate one
        *a = *b; //Saving second variable to first
        *b = t;  //Saving intermediate variable to second
}
[Compiled using Visual Studio]
