C – Enumeration

Introduction:

• An enumeration consists of a set of named integer constants.
• Each enumeration-constant in an enumeration-list names a value of the enumeration set.

Syntax:

enum identifier {             enumerator-list };

By default, the first enumeration-constant is associated with the value 0.

enum colors {             black,             red,             green,             blue,             white }; int main() {             int i;             enum colors c;             for(i=0 ; i<5 ; i++)             {                         printf(“%d \n”, c=i);             }             return 0; }

If we don’t set values explicitly, by default values set in increasing order by one:

#include<stdio.h> int main() {             enum months {Jan=1, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec};             enum months month;             printf(“month=%d\n”,month=Feb);             return 0; }

By using constant integer values, we can use the functionality of enum set elements:

#include<stdio.h> enum Days {             Sunday,             Monday,             Tuesday,             Wednesday,             Thursday,             Friday,             Saturday }; int main() {             enum Day today;             int x;             printf(“Enter Day of Week(0 to 6) : “);             scanf(“%d”,&x);             today=x;             if(today==Sunday || today==Saturday)                         printf(“Enjoy! Its the weekend\n”);             else                         printf(“Week day – do your work\n”);             return 0; }