Enum declaration - Step-by-Step Execution

Concept Flow - Enum declaration

Start

↓

Declare enum with name

↓

List enum members

↓

Assign values (optional)

↓

Use enum variables

↓

End

This flow shows how an enum is declared with members, optionally assigned values, and then used.

Execution Sample

C

enum Color {
  RED,
  GREEN,
  BLUE
};

enum Color c = GREEN;

Declares an enum Color with three members and assigns GREEN to variable c.

Execution Table

Step	Action	Enum Member	Value Assigned	Variable	Variable Value
1	Declare enum Color	RED	0 (default)
2	Assign next member	GREEN	1 (default increment)
3	Assign next member	BLUE	2 (default increment)
4	Declare variable c of type Color			c
5	Assign GREEN to c			c	1
6	End

💡 All enum members assigned default values starting at 0; variable c assigned GREEN (1).

Variable Tracker

Variable	Start	After Assignment	Final
c	uninitialized	1	1

Key Moments - 2 Insights

Why does RED get value 0 automatically?

In the execution_table rows 1-3, enum members get default values starting at 0 and increment by 1 unless explicitly assigned.

What value does variable c hold after assignment?

Row 5 shows c is assigned the value of GREEN which is 1, as tracked in variable_tracker.

Visual Quiz - 3 Questions

Look at the execution_table, what value is assigned to BLUE?

A 0

B 2

C 1

D 3

💡 Hint

Check row 3 in execution_table where BLUE is assigned value 2.

At which step is variable c assigned a value?

A Step 5

B Step 4

C Step 3

D Step 2

💡 Hint

Look at execution_table row 5 where c is assigned GREEN.

If RED was assigned value 5 explicitly, what would GREEN's value be?

A 5

B 0

C 6

D 1

💡 Hint

Enum values increment by 1 from the previous assigned value, see rows 1-3 for default behavior.

Concept Snapshot

Enum declaration in C:
enum Name { MEMBER1, MEMBER2, ... };
Members get default values starting at 0, increment by 1.
You can assign values explicitly.
Use enum variables to hold these values.
Example: enum Color { RED, GREEN, BLUE };

Full Transcript

This visual execution shows how an enum is declared in C. First, the enum Color is declared with members RED, GREEN, and BLUE. Each member gets a default integer value starting at 0 and increasing by 1. RED is 0, GREEN is 1, and BLUE is 2. Then, a variable c of type Color is declared and assigned the value GREEN, which is 1. The variable tracker shows c changes from uninitialized to 1 after assignment. Key moments clarify why RED starts at 0 and what value c holds. The quiz tests understanding of member values and assignment steps. The snapshot summarizes enum declaration syntax and behavior.