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  1. #include <stdio.h>
  2. int leap_year(int y)
  3. {  
  4.   int is_leap;
  5.   is_leap = (y % 400 == 0) || 
  6.     ((y % 4 == 0) && !(y % 100 == 0));
  7.   return is_leap;
  8. }
  9. int how_many_days(int year, int month)
  10. {
  11.   int days;
  12.   if (year < 0 || month < 1 
  13.       || month > 12)
  14.     return 0;
  15.   switch (month) 
  16.     {
  17.     case 1: case 3: case 5: case 7: 
  18.     case 8: case 10: case 12:
  19.       days = 31;
  20.       break;
  21.     case 4: case 6: case 9: case 11: 
  22.       days = 30;
  23.       break;
  24.     case 2:
  25.       days = leap_year(year)? 29 : 28; 
  26.       break;
  27.     default:
  28.       days = 0;
  29.     }
  30.   return days;
  31. }
  32. int main(void)
  33. {
  34.   int year;
  35.   int month;
  36.   int days;
  37.   scanf("%d", &year);
  38.   scanf("%d", &month);
  39.   days = how_many_days(year, month);
  40.   printf("%d\n", days);
  41.   return 0;
  42. }
  43.  
Success #stdin #stdout 0s 5320KB
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https://ideone.com/P9xPU2
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language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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