Swapping Numbers without 3rd Variable

This is a simple  Program for Swapping of Variable without 3rd Variable. This is a part of Mumbai University MCA Colleges Cpp. It is also usually asked in Interviews.

Swapping of Variable without 3rd Variable

#include <stdio.h>

#include <iostream.h>

int main()

{

int a=11;

int b=20;

b=(a+b);                 // a = 11      b=31

a=(b-a);                  // a = 20      b=31

b=(b-a);                 //  a = 20      b=11

printf("%d %d",a,b);

return 0;

}

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