no.5 使用指针在函数间通信

Posted 2020-10-08 yilubenboZZz

//使用指针完成两个数之间的交换

#include <stdio.h>
void interchange (int *u,int *v);
int main()
{
	int x=5,y=10;

	printf("originally x=%d and y= %d \\n",x,y);
	interchange(&x,&y);//向函数传送地址
	printf("now x=%d and y= %d\\n",x,y);
	return 0;

}

void interchange (int *u,int *v)
{
	int temp;

	temp = *u;//temp得到u指向的值
	*u=*v;
	*v=temp;
}