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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. class CThoiGian
  6. {
  7. private:
  8.     int hours, minutes, seconds;
  9. public:
  10.     CThoiGian(int h = 0, int m = 0, int s = 0) : hours(h), minutes(m), seconds(s) {}
  11.     bool operator>=(const CThoiGian& time)
  12.     {
  13.         if (hours > time.hours) return true;
  14.         if (hours == time.hours && minutes > time.minutes) return true;
  15.         if (hours == time.hours && minutes == time.minutes && seconds >= time.seconds) return true;
  16.         return false;
  17.     }
  18.     bool operator!=(const CThoiGian& time)
  19.     {
  20.         return hours != time.hours || minutes != time.minutes || seconds != time.seconds;
  21.     }
  22.     CThoiGian operator+(const CThoiGian& time)
  23.     {
  24.         CThoiGian res;
  25.         res.seconds = seconds + time.seconds;
  26.         res.minutes = minutes + time.minutes + res.seconds / 60;
  27.         res.seconds %= 60;
  28.         res.hours = hours + time.hours + res.minutes / 60;
  29.         res.minutes %= 60;
  30.         return res;
  31.     }
  32.     CThoiGian operator-(CThoiGian time)
  33.     {
  34.         CThoiGian res;
  35.         res.seconds = seconds - time.seconds;
  36.         if (res.seconds < 0)
  37.         {
  38.             res.seconds += 60;
  39.             time.minutes++;
  40.         }
  41.         res.minutes = minutes - time.minutes;
  42.         if (res.minutes < 0)
  43.         {
  44.             res.minutes += 60;
  45.             time.hours++;
  46.         }
  47.         res.hours = hours - time.hours;
  48.         return res;
  49.     }
  50.     CThoiGian& operator++()
  51.     {
  52.         seconds++;
  53.         if (seconds == 60)
  54.         {
  55.             seconds = 0;
  56.             minutes++;
  57.             if (minutes == 60)
  58.             {
  59.                 minutes = 0;
  60.                 hours++;
  61.                 if (hours == 24)
  62.                 {
  63.                     hours = 0;
  64.                 }
  65.             }
  66.         }
  67.         return *this;
  68.     }
  69.     CThoiGian& operator--()
  70.     {
  71.         seconds--;
  72.         if (seconds == -1)
  73.         {
  74.             seconds = 59;
  75.             minutes--;
  76.             if (minutes == -1)
  77.             {
  78.                 minutes = 59;
  79.                 hours--;
  80.                 if (hours == -1)
  81.                 {
  82.                     hours = 23;
  83.                 }
  84.             }
  85.         }
  86.         return *this;
  87.     }
  88.     friend istream& operator>>(istream& is, CThoiGian& time)
  89.     {
  90.         is >> time.hours >> time.minutes >> time.seconds;
  91.         return is;
  92.     }
  93.     friend ostream& operator<<(ostream& os, const CThoiGian& time)
  94.     {
  95.         os << time.hours << " " << time.minutes << " " << time.seconds;
  96.         return os;
  97.     }
  98. };
  99.  
  100. int main() {
  101.     CThoiGian t1(1, 30, 45);
  102.     CThoiGian t2(0, 45, 30);
  103.  
  104.     CThoiGian t3 = t1 + t2;
  105.     cout << "t1 + t2 = " << t3 << endl; // 2:16:15
  106.  
  107.     CThoiGian t4 = t1 - t2;
  108.     cout << "t1 - t2 = " << t4 << endl; // 0:45:15
  109.  
  110.     ++t1;
  111.     cout << "++t1 = " << t1 << endl; // 1:30:46
  112.  
  113.     --t2;
  114.     cout << "--t2 = " << t2 << endl; // 0:45:29
  115.  
  116.     cout << "t1 >= t2: " << (t1 >= t2) << endl; // 1
  117.     cout << "t1 != t2: " << (t1 != t2) << endl; // 1
  118.  
  119.     return 0;
  120. }
Success #stdin #stdout 0.01s 5292KB
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stdin
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Standard input is empty
stdout
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t1 + t2 = 2 16 15
t1 - t2 = 0 45 15
++t1 = 1 30 46
--t2 = 0 45 29
t1 >= t2: 1
t1 != t2: 1
https://ideone.com/nDTP2T
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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