C Language Progarm for Understand enum Data Type

#include <stdio.h>

/* Introducing an enumerated data type */

typedef enum {monday,tuesday,wednesday,thursday,friday,saturday,sunday} days;

/* Two useful functions */

days yesterday(days today);

days tomorrow(days today);

char *thedays[] = {"monday", "tuesday", "wednesday", "thursday",

                                       "friday", "saturday", "sunday"};

int main(void){

days today;

printf("today    \tyesterday  \ttomorrow\n"

         "============================================\n");

  for (today=monday;today<=sunday;today++)

    printf("%s = %d \t %s = %d \t %s = %d\n",

                   thedays[today], today,

                   thedays[yesterday(today)], yesterday(today),

                   thedays[tomorrow(today)], tomorrow(today));

}

days yesterday(days today){

  return (today+6)%7;

}

days tomorrow(days today){

  return (today+1)%7;

}

Sample Output :
today           yesterday       tomorrow
============================================
monday = 0       sunday = 6      tuesday = 1
tuesday = 1      monday = 0      wednesday = 2
wednesday = 2    tuesday = 1     thursday = 3
thursday = 3     wednesday = 2   friday = 4
friday = 4       thursday = 3    saturday = 5
saturday = 5     friday = 4      sunday = 6
sunday = 6       saturday = 5    monday = 0

Contact:

Mr. Roshan P. Helonde

Mobile: +91-7276355704

WhatsApp: +91-7276355704

Email: roshanphelonde@rediffmail.com