5.11

 1 #include<iostream>
 2 using namespace std;
 3 class zhong
 4 {
 5 private:
 6     int shi;
 7     int fen;
 8     int miao;
 9 public:
10     zhong operator++()
11     {
12         miao++;
13         if(miao==60)
14         {
15             fen++;
16             miao=0;
17         }
18         if(fen==60)
19         {
20             shi++;
21             fen=0;
22         }
23         if(shi==24) shi=0;
24         return *this;
25     }
26     zhong operator++(int)
27     {
28         zhong a=*this;
29         ++*this;
30         return a;
31     }
32     friend istream& operator>>(istream& input,zhong& a)
33     {
34         input>>a.shi>>a.fen>>a.miao;
35         return input;
36     }
37     friend ostream& operator<<(ostream& output,zhong& a)
38     {
39         output<<a.shi<<":"<<a.fen<<":"<<a.miao;
40         return output;
41     }
42 };
43 int main()
44 {
45     zhong a;
46     cin>>a;
47     a++;
48     cout<<a;
49 }