C language program to swap two numbers without third variable

//swapping two numbers without third variable

#include<stdio.h>

#include<conio.h>

void main()

{

            int i,j;

            clrscr();

            cprintf("enter the value of a:");

            scanf("%d",&i);

            cprintf("enter the value of b:");

            scanf("%d",&j);

         i=j+i;

            j=i-j;

            i=i-j;

            printf("a=%d and b=%d",i,j);

            getch();

}