L-24 MCS 260 Mon 15 Oct 2001

/* L-24 Mon 15 Oct 2001 : an enumeration type for month */

enum month { jan, feb, mar, apr, may, jun, jul, aug, sep, oct, nov, dec };
typedef  enum month  month;

month read_month ( void );
/* asks the user for a number between 1 and 12, returning the month */

void print_month ( month m );
/* prints the full name of the month on screen */

month next_month ( month m );
/* returns the month following m */

#include<stdio.h>

int main ( void )
{
   month m;

   m = read_month();
 
   printf("current month : ");
   print_month(m); printf("\n");
   printf("next month : ");
   print_month(next_month(m));
   printf("\n");

   return 0;
}

month read_month ( void )
{
   int m;

   printf("Give number between 1 and 12 : "); scanf("%d", &m);

   return ((month) (m-1));
}

void print_month ( month m )
{
   switch(m)
   {
      case jan: printf("January"); break;
      case feb: printf("February"); break;
      case mar: printf("March"); break;
      case apr: printf("April"); break;
      case may: printf("May"); break;
      case jun: printf("June"); break;
      case jul: printf("July"); break;
      case aug: printf("August"); break;
      case sep: printf("September"); break;
      case oct: printf("October"); break;
      case nov: printf("November"); break;
      case dec: printf("December"); break;
   }
}

month next_month ( month m )
{
   return ((month)  ((((int) m) + 1) % 12));
}