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C/C++ Source or Header  |  1989-11-28  |  2.0 KB  |  108 lines
  1. #include <stdio.h>
  2. #include <dos.h>
  3. #include "date.hpp"
  4.  
  5. int endmonth[13] = {0,31,59,90,120,151,181,212,243,273,304,334,365};
  6.  
  7. Date::Date(void) { ; };
  8.  
  9. Date::Date(int Mon,int Day,int Year)
  10. {
  11.     da_mon = Mon ;
  12.     da_day = Day ;
  13.     da_year = Year ;
  14. }
  15.   
  16. Date::Date(Date& adate)
  17. {
  18.     da_mon  = adate.da_mon ;
  19.     da_day  = adate.da_day ;
  20.     da_year = adate.da_year;
  21. }
  22.  
  23. /* numberdays - calculates the number of days since 1/1/0000 */
  24. long Date::numberdays(void)
  25. {
  26.     long tmp;
  27.  
  28.     /* calcute Days for current year */
  29.     tmp = (long) ((double)da_year*(double)365.25);
  30.     tmp += (long) endmonth[da_mon-1] + ((this->isleap() && da_mon>3) ? 1L : 0L);
  31.     tmp += (long) da_day;
  32.     return(tmp) ;
  33. } 
  34.     
  35. void Date::readdate(void) {
  36.     int Mon,Day,Year ;
  37.  
  38.     scanf("%d %d %d",&Mon,&Day,&Year) ;
  39.     da_mon=Mon ;
  40.     da_day=Day ;
  41.     da_year=Year ;
  42. }
  43.   
  44. void Date::printdate(void) {
  45.     printf("%02d/%02d/%04d",(int)da_mon,(int)da_day,da_year) ;
  46. } 
  47.  
  48. void Date::daytodate(long days)
  49. {
  50.     long tmp;
  51.  
  52.     /* calcute Days for current year */
  53.     da_year = (int) ((double)days / (double)365.25);
  54.     tmp = (long) ((double)da_year*(double)365.25);
  55.     days -= tmp;
  56.  
  57.     /* calculate days for current month */
  58.     for(da_mon=1;da_mon<13;da_mon++) {
  59.         if (this->isleap() && da_mon>2) {
  60.             if (days <= (long)endmonth[da_mon]+1L) 
  61.             {
  62.                 da_day = days - (long)endmonth[da_mon-1] - ((da_mon>3) ? 1L : 0L);
  63.                 break;
  64.             }
  65.         } else 
  66.                if (days <= (long)endmonth[da_mon]) 
  67.              {
  68.                  da_day = days - (long)endmonth[da_mon-1];
  69.                  break;
  70.              };
  71.       } ;
  72. }
  73.  
  74. Date Date::addday(long days)
  75. {
  76.     long start;
  77.     Date tmp;
  78.  
  79.     start = this->numberdays();
  80.     start += days;
  81.     this->daytodate(start);
  82.     return(tmp);
  83. }
  84.  
  85.  
  86. Date Date::operator+(Date& Date1)
  87. {
  88.     Date tmp;
  89.     long start,days;
  90.  
  91.     days = Date1.numberdays();
  92.     start = this->numberdays();
  93.     start += days;
  94.     tmp.daytodate(start);
  95.     return(tmp);
  96. }
  97.  
  98. int Date::operator-(Date& adate)
  99. {
  100.     return(this->numberdays()-adate.numberdays()) ;
  101. }
  102.  
  103. int daysbetween( Date& Date1, Date& Date2 ) 
  104. {
  105.     return(Date2.numberdays()-Date1.numberdays()) ;
  106. } 
  107.  
  108.