1 #include <iostream>

 2 using namespace std;

 3 int main()

 4 {

 5     const int cInt = 3;//定义常量cInt并赋值为3

 6     int oneInt = 50;//定义变量oneInt并赋值为50

 7     int& ref = oneInt;//定义变量ref引用变量oneInt，值为50

 8     const int& rc1 = cInt;//定义常量rc1，引用常量cInt，值为3，属于常引用

 9     const int& rc2 = oneInt;//定义常量rc2，引用变量oneInt，值为50

10     const int& rc3 = ref;//定义常量rc3,引用变量ref

11     int dInt = ref;//定义变量dInt，并将ref赋给dInt

12     int eInt = cInt;//定义变量eInt,将cInt赋予给eInt

13     int flnt = rc1;//定义变量flnt，将rc1赋予给flnt

14     const int gInt = oneInt;//定义常量gInt,将变量oneInt的值赋予gInt

15     int& ref1 = ref;//定义变量ref1，引用ref

16     const int hInt = ref;//定义常量hInt,并将ref赋值给hInt

17     const int jInt = cInt;//定义常量jInt,并将cInt赋值给jInt

18     const int& mInt = rc1;//定义常量mInt,引用rc1

19     const int nInt = rc2;//定义常量nInt,并将rc2赋值给nInt

20     cout << "OK" << endl;

21     int& r2 = (int&)rc1;//定义变量r2,引用强制类型转换为int型的rc1

22     int& r3 = (int&)cInt;//定义变量r3，引用强制类型转换为int型的cInt

23     return 0;

24 }