fork download
copy 
  1. #include <stdio.h>
  2. #include <time.h>
  3.  
  4. int days_between (struct tm *tsa, struct tm *tsb) {
  5.     time_t a = mktime(tsa);
  6.     time_t b = mktime(tsb);
  7.     return (b - a)/(60*60*24);
  8. }
  9.  
  10. int days_of_year (int y) {
  11.     struct tm tsa = {0};
  12.     struct tm tsb = {0};
  13.  
  14.     tsa.tm_mday = 1;
  15.     tsa.tm_year = y - 1900;
  16.  
  17.     tsb.tm_mday = 1;
  18.     tsb.tm_year = y + 1 - 1900;
  19.  
  20.     return days_between(&tsa, &tsb);
  21. }
  22.  
  23. int days_of_month (int m, int y, int *weekdays) {
  24.     struct tm tsa = {0};
  25.     struct tm tsb = {0};
  26.     int days;
  27.  
  28.     tsa.tm_mday = 1;
  29.     tsa.tm_mon = m - 1;
  30.     tsa.tm_year = y - 1900;
  31.  
  32.     tsb.tm_mday = 1;
  33.     tsb.tm_mon = m;
  34.     tsb.tm_year = y - 1900;
  35.  
  36.     days = days_between(&tsa, &tsb);
  37.     if (weekdays) {
  38.         int dss = tsa.tm_wday;
  39.         *weekdays = 8;
  40.         switch (days) {
  41.         case 31: if (dss == 0 || dss == 6) *weekdays += 1;
  42.                  dss = (dss + 1) % 7;
  43.         case 30: if (dss == 0 || dss == 6) *weekdays += 1;
  44.                  dss = (dss + 1) % 7;
  45.         case 29: if (dss == 0 || dss == 6) *weekdays += 1;
  46.         default: break;
  47.         }
  48.     }
  49.     return days;
  50. }
  51.  
  52. void print_days_info (int m, int y) {
  53.     int w;
  54.     int d = days_of_month(m, y, &w);
  55.  
  56.     printf("%d-%d: days: %d, weekdays: %d, days in year: %d\n",
  57.            m, y, d, w, days_of_year(y));
  58. }
  59.  
  60. int main (int argc, char *argv[]) {
  61.  
  62.     print_days_info(8, 2012);
  63.     print_days_info(9, 2012);
  64.     print_days_info(10, 2012);
  65.     print_days_info(11, 2012);
  66.     print_days_info(12, 2012);
  67.     print_days_info(1, 2013);
  68.     return 0;
  69. }
  70.  
Success #stdin #stdout 0.01s 1808KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
8-2012: days: 31, weekdays: 8, days in year: 366
9-2012: days: 30, weekdays: 10, days in year: 366
10-2012: days: 31, weekdays: 8, days in year: 366
11-2012: days: 30, weekdays: 8, days in year: 366
12-2012: days: 31, weekdays: 10, days in year: 366
1-2013: days: 31, weekdays: 8, days in year: 365
https://ideone.com/qQo3U
language:
C (gcc 8.3)
created:
11 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!