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  1.  
  2. #include <algorithm>
  3. #include <iostream>
  4.  
  5. struct SYSTEMTIME
  6. {
  7.     int wHour;
  8.     int wDayOfWeek;
  9.     int wMinute;
  10. } ;
  11.  
  12. // store a table of the difference in days to account for the 
  13. // rollover of days (Saturday/Sunday, Friday/Monday, etc.)
  14. size_t day_difference_table[7][7] = 
  15. {
  16.    {0, 1, 2, 3, 3, 2, 1},
  17.    {1, 0, 1, 2, 3, 3, 2},
  18.    {2, 1, 0, 1, 2, 3, 3},
  19.    {3, 2, 1, 0, 1, 2, 3},
  20.    {3, 3, 2, 1, 0, 1, 2},
  21.    {2, 3, 3, 2, 1, 0, 1},
  22.    {1, 2, 3, 3, 2, 1, 0}
  23. };
  24.  
  25. // returns a single size_t value for the difference in times
  26. // by having the days->hours->minutes shifted over 8 bits each    
  27. size_t timediff(const SYSTEMTIME& t0, const SYSTEMTIME& t1)
  28. {
  29.    // start with an assumption of an absolute match
  30.    size_t diff = 0;
  31.  
  32.    // get the absolute value of the difference in the days
  33.    // as the day exerts the biggest influence on the result
  34.    diff = day_difference_table[t0.wDayOfWeek][t1.wDayOfWeek];
  35.  
  36.    // shift right, since days are "worth more" than hours or minutes...
  37.    diff <<= 8;
  38.  
  39.    // then the hours...
  40.    diff += std::abs(t0.wHour - t1.wHour);
  41.  
  42.    // shift right, since hours are "worth more" than minutes
  43.    diff <<= 8;
  44.  
  45.    // then the minutes
  46.    diff += std::abs(t0.wMinute - t1.wMinute);
  47.  
  48.    // nothing left to shift ;)
  49.  
  50.    return diff;
  51. }
  52.  
  53.  
  54.  
  55. int main()
  56. {
  57.    SYSTEMTIME m_MatchTime[3];
  58.  
  59.    //current time
  60.    m_MatchTime[0].wDayOfWeek = 0;
  61.    m_MatchTime[0].wHour = 23;
  62.    m_MatchTime[0].wMinute = 59;
  63.  
  64.    // 23:59 from 0
  65.    m_MatchTime[1].wDayOfWeek = 0;
  66.    m_MatchTime[1].wHour = 0;
  67.    m_MatchTime[1].wMinute = 0;
  68.  
  69.     // 0:01 from 0
  70.     m_MatchTime[2].wDayOfWeek = 1;
  71.     m_MatchTime[2].wHour = 0;
  72.     m_MatchTime[2].wMinute = 0;
  73.  
  74.    std::cout << "Difference (23:59 actuallty): " << timediff(m_MatchTime[0], m_MatchTime[1]) << "\n";
  75.    std::cout << "Difference: (0:01 actually)" << timediff(m_MatchTime[0], m_MatchTime[2]) << "\n";
  76. }
  77.  
Success #stdin #stdout 0.01s 2724KB
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stdin
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Standard input is empty
stdout
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Difference (23:59 actuallty): 5947
Difference: (0:01 actually)71483
https://ideone.com/9YTKNA
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
secret

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