C Programming on SWAPing of TWO VARIABLES WITHOUT USING of THIRD VARIABLE

void main()

{

  int a,b;

  clrscr();

  printf("\nEnter two numbers:");

  scanf("%d %d",&a,&b);

  printf("\nBefore swapping a=%d b=%d",a,b);

            a=a^b;

            b=b^a;

            a=a^b;

  printf("\nAfter swapping a=%d b=%d",a,b);

  getch();

}