利用指针交换两个值（c语言）

# include <stdio.h>
void exchange(int * p, int * q)
{
	int t ;
	t = *p ;
	*p = *q ;
	*q = t;
}
int main(void)
{
	int a = 3;
	int b = 5;
	exchange(&a, &b);
	printf("a= %d , b = %d", a, b);
	return 0;
}