Write a program to exchange two variables in C without third variable or stack or cpu register.

Source Code

 /* xchg.cpp : Exchange two variables in C
              without third variable or
              stack or cpu register
/
*/

 #include<stdio.h>

 int main(int argc, char* argv[])

 {

   int a, b;

   a = 2;

   b = 3;

   printf("Enter value for a = ");

   scanf("%d", &a);

   printf("Enter value for b = ");

   scanf("%d", &b);

   printf("Doing exchange with XCHG\n");

   _asm{

    mov eax, a

    xchg eax, b

    mov a, eax

   }

   printf("Values after XCHG a = %d, b = %d\n", a, b);

   return 0;

 }

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