Enumeration (or enum) is a user defined data type in C. It is mainly used to assign names to integral constants, the names make a program easy to read and maintain.
enum State {Working = 1, Failed = 0};
The keyword ‘enum’ is used to declare new enumeration types in C and C++. Following is an example of enum declaration.
// The name of enumeration is "flag" and the constant
// are the values of the flag. By default, the values
// of the constants are as follows:
// constant1 = 0, constant2 = 1, constant3 = 2 and
// so on.
enum flag{constant1, constant2, constant3, ....... };
Variables of type enum can also be defined. They can be defined in two ways:
// In both of the below cases, "day" is
// defined as the variable of type week.
enum week{Mon, Tue, Wed};
enum week day;
// Or
enum week{Mon, Tue, Wed}day;
// An example program to demonstrate working
// of enum in C
#include<stdio.h>
enum week{Mon, Tue, Wed, Thur, Fri, Sat, Sun};
int main()
{
enum week day;
day = Wed;
printf("%d",day);
return 0;
}
