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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. #include <iostream>
  5.  
  6. // type for representing day in a month: [1, 31]
  7. typedef int Day;
  8.  
  9. // type for representing a month: JAN for January, etc.
  10. enum Month {JAN =1, FEB, MAR, APR, MAY, JUN, JUL, AUG, SEP, OCT, NOV, DEC};
  11.  
  12. // return next month
  13. Month inc(Month m);
  14.  
  15. // return previous month
  16. Month dec(Month m);
  17.  
  18. // check if given year is leap
  19. bool isLeap(int year);
  20.  
  21. // set next date (account leap years)
  22. void nextDate(int & year, Month & month, Day & day);
  23.  
  24. // return next month
  25. Month inc(Month m) {
  26.     return (m == DEC) ? JAN : static_cast<Month> (m + 1);
  27. }
  28.  
  29. // return previous month
  30. Month dec(Month m) { 
  31.     return (m==JAN) ? DEC :static_cast<Month> (m-1);
  32. }
  33.  
  34. // check if given year is leap
  35. bool isLeap(int year) {
  36.     if  (year % 400==0)
  37.         return true;
  38.     else
  39.     if  ((year % 100!=0)&&(year % 4 ==0))
  40.         return true;
  41.     else
  42.         return false;
  43.  
  44. }
  45.  
  46. // set next date (account leap years)
  47. void nextDate(int & year, Month & month, Day & day)  { 
  48.     switch(day) {
  49.     case 1:
  50.     case 2:
  51.     case 3:
  52.     case 4:
  53.     case 5:
  54.     case 6:
  55.     case 7:
  56.     case 8:
  57.     case 9:
  58.     case 10:
  59.     case 11:
  60.     case 12:
  61.     case 13:
  62.     case 14:
  63.     case 15:
  64.     case 16:
  65.     case 17:
  66.     case 18:
  67.     case 19:
  68.     case 20:
  69.     case 21:
  70.     case 22:
  71.     case 23:
  72.     case 24:
  73.     case 25:
  74.     case 26:
  75.     case 27: {
  76.         day++;
  77.         break;
  78.     }
  79.     case 28: {
  80.         if (!(isLeap(year))&&(month==FEB)) {
  81.             day=1;
  82.             inc(month);
  83.         }
  84.         else day++;
  85.         break;
  86.     }
  87.     case 29: {
  88.         if (month==FEB){
  89.             month = inc(month);
  90.             day=1;
  91.  
  92.         }
  93.         else day++;
  94.         break;
  95.     }
  96.     case 30: {
  97.         if ((month==APR)||(month==JUN)||(month==SEP)||(month==NOV)) {
  98.             day=1;
  99.             inc(month);
  100.         }
  101.         else
  102.             day++;
  103.         break;
  104.     }
  105.     case 31: {
  106.         if (month==DEC)
  107.         year++;
  108.         day=1;
  109.         inc(month);
  110.         break;
  111.      }
  112.   }
  113. }
  114.  
  115. using namespace std;
  116. int main() {
  117.     int y = 2012;
  118.     Month m = FEB;
  119.     Day d = 28;
  120.  
  121.     nextDate ( y, m, d );
  122.  
  123.    	cout << "was: " << y << " " << m << " " << d << endl;
  124.  
  125.     nextDate ( y, m, d );
  126.  
  127. 	cout << "become: " << y << " " << m << " " << d << endl;
  128. }
Success #stdin #stdout 0s 3340KB
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was: 2012 2 29
become: 2012 3 1
https://ideone.com/x9WyXJ
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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