gistfile1.c

#include<stdio.h>

int main()
{
  {
	#define M1(x,y) ((x)^=(y), (y)^=(x), (x)^=(y))
	unsigned int i=3, j=8, k=M1(i,j);
	printf("i=%d,, j=%d, k=%d\n",i,j,k);
	}
	return 0;
}