C enum

An enumeration (enum) is a set of named integer constants. It makes the code easy to read, because you use names like MONDAY instead of numbers like 1.

Define and use

#include <stdio.h>

enum Day { MON, TUE, WED, THU, FRI, SAT, SUN };

int main(void) {
    enum Day today = WED;

    printf("%d\n", today);
    printf("%d\n", SUN);
    return 0;
}

Output:

By default the first name is 0, and each next name is one more.

Custom values

#include <stdio.h>

enum Level { LOW = 1, MEDIUM = 5, HIGH = 10 };

int main(void) {
    enum Level l = MEDIUM;
    printf("%d\n", l);
    return 0;
}

Output:

enum with switch

#include <stdio.h>

enum Color { RED, GREEN, BLUE };

int main(void) {
    enum Color c = GREEN;

    switch (c) {
        case RED:   printf("Stop\n"); break;
        case GREEN: printf("Go\n"); break;
        case BLUE:  printf("Blue light\n"); break;
    }
    return 0;
}

Output:

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