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  1. #include <stdio.h>
  2.  
  3. static char daytab[2][13]={
  4.     {0,31,28,31,30,31,30,31,31,30,31,30,31},
  5.     {0,31,29,31,30,31,30,31,31,30,31,30,31}
  6. };
  7.  
  8. int day_of_year(int year,int month,int day);
  9. void month_day(int year,int yearday);
  10.  
  11. int main(void)
  12. {
  13.     int day,mo,dat;
  14.  
  15.     day=day_of_year(1988,2,29);
  16.     printf("%d\n",day);
  17.     month_day(1988,60);
  18.     return 0;
  19. }
  20.  
  21. /* day_of_year: set day of year from month & day */
  22.  
  23. int day_of_year(int year,int month,int day)
  24. {
  25.     int i,leap;
  26.  
  27.     leap = year % 4 == 0 && year%100 != 0 || year%400 == 0;
  28.  
  29.     for(i=1;i<month;i++)
  30.         day += daytab[leap][i];
  31.  
  32.     return day;
  33. }
  34.  
  35. /* month_day: set month,day from day of year */
  36.  
  37. void month_day(int year,int yearday)
  38. {
  39.     int i,leap;
  40.  
  41.     leap = year % 4 == 0 && year%100 != 0 || year%400 == 0;
  42.  
  43.     for(i=1;yearday > daytab[leap][i];i++)
  44.         yearday -= daytab[leap][i];
  45.  
  46.     printf("Month: %d, Day: %d\n", i, yearday);
  47. }
  48.  
Success #stdin #stdout 0s 4260KB
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Standard input is empty
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60
Month: 2, Day: 29
https://ideone.com/p4AsbM
language:
C (gcc 8.3)
created:
4 years ago
visibility:
public

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