1 #include<iostream>
 2 #include<iomanip>
 3 using namespace std;
 4 class Clock{
 5     int hour;
 6     int minute;
 7     int second;
 8 public:
 9     Clock(int hour=0, int minute=0, int second=0);
10     
11     void setTime(int hour, int minute, int second);
12     void showTime();
13 
14     bool operator > (Clock& c);
15     bool operator < (Clock& c);
16 };
17 //构造
18 Clock::Clock(int hour, int minute, int second)
19 {
20     this->hour = hour;
21     this->minute = minute;
22     this->second = second;
23 }
24 //设置
25 void Clock::setTime(int hour, int minute, int second)
26 {
27     this->hour = hour;
28     this->minute = minute;
29     this->second = second;
30 }
31 //显示
32 void Clock::showTime(){
33     cout<<setw(2)<<setfill('0')<<hour<<":";
34     cout<<setw(2)<<setfill('0')<<minute<<":";
35     cout<<setw(2)<<setfill('0')<<second<<":";
36     cout<<endl;
37 }
38 //重载>
39 bool Clock::operator > (Clock& c){
40     return (hour*60*60 + minute*60 + second)>
41          (c.hour*60*60 + c.minute*60 + c.second);
42 }
43 //重载<
44 bool Clock::operator < (Clock& c){
45     return (hour*60*60 + minute*60 + second)<
46          (c.hour*60*60 + c.minute*60 + c.second);
47 }
48     /* //友元函数，运算符重载
49     friend bool operator > (Clock& c1,Clock& c2){
50         return (hour*60*60 + minute*60 + second)>
51          (c.hour*60*60 + c.minute*60 + c.second);
52     } 
53     friend bool operator < (Clock& c1,Clock& c2){
54         return (hour*60*60 + minute*60 + second)<
55          (c.hour*60*60 + c.minute*60 + c.second);
56     }
57     */
58 int main()   
59 {     
60     Clock c1,c2;
61     c1.showTime();
62     c2.showTime();
63     
64     c1.setTime(1,55,30);
65     c2.setTime(12,4,55);
66     c1.showTime();
67     c2.showTime();
68     
69     bool timeCompare = c1>c2;
70     cout<<"c1>c2=" << boolalpha << timeCompare << endl;
71     
72     timeCompare = c1<c2;
73     cout<<"c1<c2=" << boolalpha << timeCompare << endl;
74     return 0;
75 }