Enum declaration - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is an enum in C?

An enum is a user-defined type in C that consists of named integer constants. It helps make code more readable by giving names to sets of related values.

beginner

How do you declare a simple enum for days of the week in C?

You declare it like this:<br>

enum Days { Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday };

beginner

What values do enum members get by default if not assigned explicitly?

By default, the first member gets the value 0, and each following member gets the previous member's value plus 1.

intermediate

Can you assign specific integer values to enum members? Give an example.

Yes, you can assign specific values. Example:<br>

enum Colors { Red = 1, Green = 5, Blue = 10 };

beginner

How do you use an enum variable in C?

First declare a variable of the enum type, then assign one of the enum members to it. Example:<br>

enum Days today = Monday;

What is the default value of the first member in an enum if not assigned?

A -1

B 0

C 1

D Undefined

The first enum member defaults to 0 if no value is assigned.

How do you declare an enum named Fruit with members Apple, Banana, and Cherry?

A enum Fruit = { Apple, Banana, Cherry };

B enum Fruit(Apple, Banana, Cherry);

C enum { Fruit = Apple, Banana, Cherry };

D enum Fruit { Apple, Banana, Cherry };

The correct syntax is: enum Fruit { Apple, Banana, Cherry };

If you assign Red = 3 in an enum, what value does the next member get if not assigned?

A 4

B Undefined

C 0

D 3

The next member gets the previous member's value plus 1, so 4.

Which of these is a valid enum declaration in C?

A enum Status { OK:0, ERROR:1 };

B enum Status = (OK, ERROR);

C enum Status { OK = 0, ERROR = 1 };

D enum Status [OK, ERROR];

Option C uses correct C enum syntax.

How do you declare a variable named today of enum type Days?

A enum Days today;

B Days enum today;

C enum today Days;

D Days today;

You declare it as: enum Days today;

Explain what an enum is and why it is useful in C programming.

Think about how enums help replace numbers with names.

Describe how to assign specific values to enum members and what happens to subsequent members without assigned values.

Consider how numbering works inside enums.