引用的使用方式

#include <iostream>

using namespace std;
int main()
{
    int num = 110;
    int &rel_num = num;
    /*
    等价于
    int *rel_num = &num;
    *rel_num = 120;
    */
    const int &rel_num2 = 119;

    cout<<&num<<‘\t‘<<num<<endl;
    cout<<&rel_num2<<‘\t‘<<rel_num2<<endl;

    rel_num = 120;
    cout<<&num<<‘\t‘<<&rel_num<<endl;
    cout<<num<<‘\t‘<<rel_num<<endl;

    return 0;
}