c++函数里的传值 传址

#include<iostream>using namespace std;void fun1(int *p1){p1=new int(10);cout<<"*p1="<<*p1<<endl;}void fun2(int * & p2){p2=new int(5);cout<<"*p2="<<*p2<<endl;}void fun3(int *p1){*p1=122;cout<<"fun3:*p1="<<*p1<<endl;}void main(){int *p=new int(1);cout<<"main:*p="<<*p<<endl;fun3(p);cout<<"main:*p="<<*p<<endl;fun1(p);cout<<"main After:fun1:*p="<<*p<<endl;fun2(p);cout<<"main After:fun2:*p="<<*p<<endl;}

以上代码，运行后结果如下图：

fun1()函数里的p1指针，有发生传值调用时的拷贝！最耐人寻味的是fun2！！！