#include <stdio.h>#include <math.h>int main(void){	int a, b, t;		scanf("%d%d", &a, &b);	/*	方法一:三变量法	t = a;	a = b;	b = t;		方法二:	a = a - b;	b = a + b;	a = b - a;	方法二变种:	a = a + b;	b = a - b;	a = a - b;	*/	//方法三:异或运算,原因是对于整形变量a,有a^a=0	a = a ^ b;	b = a ^ b;	a = a ^ b;		printf("%d %d\n", a, b);    return 0;}