指针引用与引用之间的区别

      感觉指针和引用之间的奇妙，写了两端代码以搞清楚指针引用和引用的用法

    读C＋＋primer 一书

    感觉指针和引用之间的奇妙，写了两端代码以搞清楚指针引用和引用的用法

    #include <iostream>

    using namespace std;

    int main(void)
    {
     int  ival1 = 1024 ;
     int *pival1 = &ival1;   //ival的指针
     int *& pi1 = pival1;   //ival的指针的引用

     int  ival2 = 2048;
     int *pival2 = &ival2;   //iva2的指针
     int *& pi2 = pival2;   //iva2的指针的引用

     cout<<"ival1: "<<ival1<<endl;
     cout<<"pival1:"<<pival1<<endl;
     cout<<"pi1:   "<<pi1<<endl;
     cout<<"ival2: "<<ival2<<endl;
     cout<<"pival2:"<<pival2<<endl;
     cout<<"pi2:   "<<pi2<<endl;

     cout<<"-------------------"<<endl;

     *pi1 = *pi2;    //解除指针引用

     cout<<"ival1: "<<ival1<<endl;
     cout<<"pival1:"<<pival1<<endl;
     cout<<"pi1:   "<<pi1<<endl;
     cout<<"ival2: "<<ival2<<endl;
     cout<<"pival2:"<<pival2<<endl;
     cout<<"pi2:   "<<pi2<<endl;

     /*out put
     ival1: 1024
     pival1:0xbfffe6a4
     pi1:   0xbfffe6a4
     ival2: 2048
     pival2:0xbfffe698
     pi2:   0xbfffe698
     -------------------
     ival1: 2048
     pival1:0xbfffe6a4
     pi1:   0xbfffe6a4
     ival2: 2048
     pival2:0xbfffe698
     pi2:   0xbfffe698

     */
     //输出说明*pi1 = *pi2;
     //之间的赋值并未改变指针引用的值，即地址的值
     //而是改变了引用对象的值
    }

    ///////////////////////////////////////////////////////////////////////////////////

    #include <iostream>

    using namespace std;

    int main(void)
    {
     int  ival1 = 1024 ;
     int *pival1 = &ival1;
     int *& pi1 = pival1;

    int  ival2 = 2048;
     int *pival2 = &ival2;
     int *& pi2 = pival2;

     cout<<"ival1: "<<ival1<<endl;
     cout<<"pival1:"<<pival1<<endl;
     cout<<"pi1:   "<<pi1<<endl;
     cout<<"ival2: "<<ival2<<endl;
     cout<<"pival2:"<<pival2<<endl;
     cout<<"pi2:   "<<pi2<<endl;

     cout<<"-------------------"<<endl;

     pi1 = pi2;
     cout<<"ival1: "<<ival1<<endl;
     cout<<"pival1:"<<pival1<<endl;
     cout<<"pi1:   "<<pi1<<endl;
     cout<<"*pi1:  "<<*pi1<<endl;

     cout<<"ival2: "<<ival2<<endl;
     cout<<"pival2:"<<pival2<<endl;
     cout<<"pi2:   "<<pi2<<endl;
     cout<<"*pi2:  "<<*pi2<<endl;

     /*out put
     ival1: 1024
     pival1:0xbffff5a4
     pi1:   0xbffff5a4
     ival2: 2048
     pival2:0xbffff598
     pi2:   0xbffff598
     -------------------
     ival1: 1024
     pival1:0xbffff598
     pi1:   0xbffff598
     *pi1:  2048
     ival2: 2048
     pival2:0xbffff598
     pi2:   0xbffff598
     *pi2:  2048
     */
     //输出说明，指针引用之间的赋值只改变指针的值
     //引用对象的值没有改变
    }