# include <stdio.h>

int main ( )
{
  int days;
  int month;
  int year;

  printf ( "Enter a month and year as integers: " );
  scanf ( "%i%i", &month, &year );

  if ( year <= 0 )
  {
    printf ( "Illegal year = %d\n", year );
    return 1;
  }

  switch ( month )
  {
    case 4:
    case 6:
    case 9:
    case 11:
      days = 30; 
      break;

    case 2:
      if ( year % 4 == 0 )
      {
        days = 29;
      }
      else
      {
        days = 28;
      }
      break;

    case 1:
    case 3:
    case 5:
    case 7:
    case 8:
    case 10:
    case 12:
      days = 31;
      break;

    default:
      printf ( "Illegal month index = %d\n", month );
      return 2;
  }

  printf ( "In %i, month #%i has %i days.\n", year, month, days );

  return 0;
}