Swap Magic

/*	
	Swapper
	Swaps values between two variables without using a third temporary variable
	Programmer: Fazle Arefin
*/
/*	
	use #include <iostream.h> and cout instead of #include <stdio.h> and printf
	if you are using C++, this gives type safety, I didn't use them to keep this
	program C compatible
*/
#include <stdio.h>
int main() {
	int a = 10;
	int b = 20;
	printf("Before swapping a = %d and b = %d \n", a, b);
	a = a + b;
	b = a - b;
	a= a - b;
	/*	
		instead of + and - you can use * and / respectively
		a = a * b;
		b = a / b;
		a= a / b;
		
		instead of + and - or * and / you can use the XOR operator ^
		but this restricts you to only swapping integers
		a = a ^ b;
		b = a ^ b;
		a= a ^ b;
	*/
	
	printf("After swapping a = %d and b = %d \n", a, b);
	return 0;
}