C语言交换两个整型变量的值

#include <stdio.h>

#define SWAP1(a,b)\
{				\
	int t = a;  \
		a = b; \
		b = t; \
}

#define SWAP2(a,b)\
{				\
	a = a+b;  \
	b = a-b; \
	a = a-b;\
}

#define SWAP3(a,b)\
{				\
	a = a^b;\
	b = a^b;\
	a = a^b;\
}
int main()
{
   
   
	int a = 1;