#include<stdio.h>
#include<conio.h>
    int x,y;
    void exchange();
    void main()
    {
        clrscr();
        printf("\n Enter The Value Of X : ");
        scanf("%d",&x);
        printf("\n Enter The Value Of Y : ");
        scanf("%d",&y);
        exchange();
        printf("\n After The exchange : ");
        printf("\n Value Of X = %d \n Value Of Y = %d",x,y);
        getch();
    }
    void exchange()
    {
        x=x+y;       /* let x = 22 & y = 12  */

        y=x-y;       /* x=22+12=34 so, y=34-12=22 & x=34-22=12 */

        x=x-y;
    }

/*
     ******
     OUTPUT
     ******


     Enter The Value Of X : 45

     Enter The Value Of Y : 22

     After The exchange :
     Value Of X = 22
     Value Of Y = 45

*/