算法笔记—2.7.5 指针的引用

算法笔记—2.7.5 指针的引用

/*
P69-指针的引用*/
#include <stdio.h>
  
  void sawp(int* &p1,int* &p2);
   
 int main(void)
 {
 	int a = 1,b = 2;
 	//scanf("%d%d",&a,&b);
 	
 	int* p1 = &a;
 	int* p2 = &b;
 	
 	sawp(p1,p2);
 	//printf("a= %d,b = %d",a,b);
 	printf("a= %d,b = %d",*p1,*p2);
 	
	 return 0;
 	
  } 
  void sawp(int* &p1,int* &p2)
  {
  	int* temp = p1;
  	p1 = p2;
  	p2 = temp;
  }
  
  /*
  printf("a= %d,b = %d",a,b);
  输出结果:
  a= 1,b = 2
  ------------------------
  printf("a= %d,b = %d",*p1,*p2);
  输出结果:
  a= 2,b = 1
  理解:
  1.引用的本质就是对变量取了一个别名.
  2.指针的引用,在本代码中.实际上是改变了指针的指向.也就是p1,p2所存放的地址互换了. 
  */

来源：CSDN

作者：pounds008

链接：https://blog.csdn.net/pounds008/article/details/103930400