Enumerations in C

An enumeration (enum) is a user-defined data type that assigns names to a set of integer values.

In this lesson, you will learn:

• How to define and use enumerations.
• How enum improves code readability.
• How to assign custom values to enumeration constants.

What is an Enumeration?

Enumerations assign names to a set of integer constants.

Example declaration:

enum Color {RED, GREEN, BLUE};

By default, RED is 0, GREEN is 1, and BLUE is 2.

Using an Enumeration

Once defined, enum can be used as a variable type:

enum Color myColor; myColor = GREEN;

Now, myColor holds the value 1.

Example: Using Enumeration

This program demonstrates how to define and use an enumeration.

#include <stdio.h>

enum Color {RED, GREEN, BLUE};

int main() {
    enum Color myColor = GREEN;
    printf("Selected color: %d\n", myColor);
    return 0;
}

Assigning Custom Values

You can assign specific values to enum constants:

enum Status {SUCCESS = 1, FAILURE = 0};

Now, SUCCESS is 1 and FAILURE is 0.

Example: Custom Values in Enum

This program demonstrates assigning custom values in an enum.

#include <stdio.h>

enum Status {SUCCESS = 1, FAILURE = 0};

int main() {
    enum Status result = SUCCESS;
    printf("Operation result: %d\n", result);
    return 0;
}

Enum with Incremental Values

By default, enum values increase by 1 unless explicitly assigned:

enum Days {SUN = 1, MON, TUE, WED};

Here, MON is 2, TUE is 3, and so on.

Advantages of Using Enumerations

Enumerations improve code readability and maintainability:

• They replace hard-coded numbers with meaningful names.
• They prevent accidental assignment of invalid values.
• They make debugging easier.

Summary

In this lesson, you learned:

• How to define and use enumerations.
• How to assign custom values to enum constants.
• How enum improves code readability and efficiency.

Next, we will explore file handling in C!