Enum declaration syntax in C Sharp (C#) - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is an enum in C#?

An enum (short for enumeration) is a special data type that lets you define a group of named constant values. It helps make code more readable by using names instead of numbers.

beginner

How do you declare a simple enum in C#?

Use the enum keyword followed by the enum name and a list of named values inside curly braces. For example:<br>

enum Days { Sunday, Monday, Tuesday }

intermediate

Can you assign specific integer values to enum members in C#?

Yes, you can assign specific integer values to enum members by using the equals sign. For example:<br>

enum Days { Sunday = 1, Monday = 2, Tuesday = 3 }

intermediate

What is the default underlying type of an enum in C#?

The default underlying type of an enum in C# is int. This means each enum member is stored as an integer unless you specify a different type.

advanced

How do you specify a different underlying type for an enum in C#?

You specify the underlying type by adding a colon and the type name after the enum name. For example:<br>

enum Days : byte { Sunday, Monday, Tuesday }

This makes the enum use byte instead of int.

Which keyword is used to declare an enum in C#?

A enum

B class

C struct

D interface

The enum keyword is used to declare an enumeration type in C#.

What is the default underlying type of an enum in C#?

A byte

B string

C int

D long

By default, enums use int as their underlying type.

How do you assign a specific integer value to an enum member?

A You cannot assign specific values

B Use a colon after the member name

C Use parentheses after the member name

D Use an equals sign after the member name

You assign values using an equals sign, like Sunday = 1.

Which of these is a valid enum declaration with a specified underlying type?

A enum Colors { Red, Green, Blue }

B enum Colors : byte { Red, Green, Blue }

C enum Colors = int { Red, Green, Blue }

D enum Colors (int) { Red, Green, Blue }

The correct syntax to specify the underlying type is with a colon, like enum Colors : byte.

What will be the integer value of the first member if you don't assign values explicitly?

A 0

B 1

C -1

D Undefined

By default, the first enum member has the value 0, and the rest increment by 1.

Explain how to declare an enum in C# and how to assign specific values to its members.

Think about the basic syntax and how to set numbers for each name.

Describe the default underlying type of enums in C# and how to change it.

Remember the colon syntax after the enum name.