Enum vs constants decision in C Sharp (C#) - Quick Revision & Key Differences

Recall & Review

beginner

What is an enum in C#?

An enum (short for enumeration) is a special data type that lets you define a set of named constant values. It helps group related constants under one type for better readability and type safety.

beginner

What are constants in C#?

Constants are fixed values declared with the keyword const. They cannot change during program execution and are usually used for single fixed values like numbers or strings.

intermediate

When should you use an enum instead of constants?

Use enums when you have a group of related named values that represent a category or set of options. Enums improve code clarity and help prevent invalid values by restricting inputs to the defined set.

intermediate

When are constants preferred over enums?

Use constants when you need a single fixed value or unrelated fixed values. Constants are simpler and better for values like mathematical constants or configuration strings.

intermediate

What is a key advantage of enums over constants?

Enums provide type safety, meaning the compiler can check if you use only valid values from the enum. Constants do not provide this safety since they are just individual values.

Which of the following is true about enums in C#?

A Enums are used for unrelated single fixed values.

B Enums group related named constants under one type.

C Enums can change their values during runtime.

D Enums cannot be used with switch statements.

Enums group related named constants and provide type safety. Their values cannot change at runtime.

When should you use a constant instead of an enum?

A When you have multiple related named values.

B When you want to restrict inputs to a set.

C When you need a single fixed value like Pi.

D When you want type safety for a set of options.

Constants are best for single fixed values like Pi or configuration strings.

What keyword is used to declare a constant in C#?

A const

B enum

C static

D readonly

The const keyword declares a constant value in C#.

Which feature is a benefit of enums over constants?

A They provide type safety.

B They can be changed at runtime.

C They are faster to access.

D They use less memory.

Enums provide type safety by restricting values to the defined set.

Can enums be used in switch statements in C#?

A No, enums cannot be used in switch statements.

B Only if the enum is declared as public.

C Only if the enum values are integers.

D Yes, enums work well with switch statements.

Enums are commonly used in switch statements to handle different cases clearly.

Explain when you would choose an enum over constants in C# and why.

Think about grouping and safety.

Describe a scenario where constants are better than enums and explain your reasoning.

Consider simple fixed values like Pi.