Enum declaration - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of enum variable assignment

What is the output of this C code?

C

#include <stdio.h>

enum Color { RED, GREEN, BLUE };

int main() {
    enum Color c = GREEN;
    printf("%d", c);
    return 0;
}

A 0

B 1

C Compilation error

D 2

💡 Hint

Remember that enum values start from 0 by default.

The enum Color assigns RED=0, GREEN=1, BLUE=2. So printing GREEN prints 1.

❓ Predict Output

intermediate

Enum with custom values output

What will this program print?

C

#include <stdio.h>

enum Status { OK = 5, WARNING = 10, ERROR = 15 };

int main() {
    enum Status s = WARNING;
    printf("%d", s);
    return 0;
}

A 0

B 5

C 15

D 10

💡 Hint

Check the assigned values for each enum member.

The enum WARNING is assigned the value 10 explicitly, so printing it outputs 10.

🔧 Debug

advanced

Identify the error in enum declaration

What error will this code produce?

C

enum Days { MON, TUE, WED = "3", THU, FRI };

int main() {
    enum Days today = WED;
    return 0;
}

A No error, compiles fine

B Warning: implicit conversion from string to int

C TypeError: enum member must be integer constant

D SyntaxError: enum member cannot be a string

💡 Hint

Enum values must be integer constants.

Enum members must be integer constants. Assigning a string literal causes a type error during compilation.

❓ Predict Output

advanced

Enum auto-increment behavior

What is the output of this program?

C

#include <stdio.h>

enum Numbers { ONE = 1, TWO, FIVE = 5, SIX };

int main() {
    printf("%d %d %d %d", ONE, TWO, FIVE, SIX);
    return 0;
}

A 1 2 5 6

B 1 1 5 6

C 1 2 5 5

D 1 2 6 7

💡 Hint

Enum values auto-increment from the previous value.

ONE is 1, TWO auto-increments to 2, FIVE is explicitly 5, SIX auto-increments to 6.

🧠 Conceptual

expert

Number of items in enum

How many items are in this enum?

C

enum Letters { A = 3, B, C = 7, D, E };

A 5

B 4

C 3

D 6

💡 Hint

Count all declared enum members regardless of their values.

The enum declares five members: A, B, C, D, and E.