C语言交换两个变量的值，用指针方式

#include<stdio.h>
#include<Windows.h>

//方法一：定义临时变量
void change(int *a,int *b)
{
    int c;
    c = *a;//相当于 c = a;  
    *a= *b;//相当于 a = b
    *b= c; //相当于 b= c
}
方法二：利用加减法运算
void inplace_swap2(int*a,int*b)
{
    *a=*a+*b;
    *b=*a-*b;
    *a=*a-*b;
}

//方法三：利用位运算 (当*x和*y相等时，此方法不可用)
void inplace_swap3(int *x, int *y)
{
	*y = *x^*y;
	*x = *x^*y;
	*y = *x^*y;
}

int main()
{
	int a = 6;
	int b = 9;
	printf("交换之前的a:%d,b:%d\n",a,b);
	inplace_swap(&a, &b);
	printf("交换之后的a:%d,b:%d\n", a, b);
	system("pause");
	return 0;
}