使用引用、指针操作变量(C++)

hello.cpp

#include <iostream>
using namespace std;


int main()
{
     int a = 20; //声明一个int变量
     int &b = a; //声明一个int引用
     int *p = &a;//声明一个int指针

     cout<<"start,a="<<a<<endl;
     b = b+1;
     cout<<"then,b+1 = "<<b<<endl;
     *p=*p+1;
     cout<<"then,*p+1 = "<<*p<<endl;
     cout<<"final,a="<<a<<endl;
     return 0;
};
/*====result====
start,a=20
then,b+1 = 21
then,*p+1 = 22
final,a=22
*/