交换两个数，不引入第三个变量。c语言

#include <stdio.h>
int main()
{
	int a = 0;
	int b = 0;
	printf("请输入两个数:>");
	scanf("%d %d", &a, &b);
	a = a + b;
	b = a - b;
	a = a - b;
	printf("a=%d,b=%d\n", a, b);
	return 0;
}