#include <stdio.h>
#include <stdlib.h>

int main(void) {

  int month, numberOfDays, leapYear;

  printf("Enter a month - a number between 1 and 12: ");
  scanf("%d", &month);
  printf("Is it a leap year (1) or not (0): ");
  scanf("%d", &leapYear);

  switch(month){
    case 1: case 3: case 5: case 7: case 8: case 10: case 12: 
      numberOfDays = 31; break;
    case 4: case 6: case 9: case 11: 
      numberOfDays = 30; break;
    case 2:
      if (leapYear) 
         numberOfDays = 29; 
      else 
         numberOfDays = 28;
      break;
    default: exit(-1);  /* Stop the program */
  } 

  printf("There are %d days in month %d\n", numberOfDays, month);

  return 0;
}