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45 interview questions on Language C - Fundamentalsfor developers (2026)

Test your technical skills before an interview of Language C - Fundamentals with 45 corrected questions. Beginner, Intermediate or Expert level.

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45 questions
Easy
8 votes933 runs2 comments

What is the size of a long long in C++?

IT Architect
c++
memory
Vincent Cotroat Nov 3, 2023
Medium
7 votes352 runs
1 comment

Undefined behavior.

IT Architect
memory
pointers
Abha Agrawaat Jan 2, 2024
Easy
5 votes387 runs0 comment

Find the sum of all even numbers in an array in C

IT Architect
array
for loop
Vincent Cotroat Mar 23, 2023
Easy
3 votes416 runs0 comment

Write a C function to swap two integers.

IT Architect
pointers
functions
Vincent Cotroat Mar 21, 2023
Easy
3 votes198 runs0 comment

Write a C program that calculates the average of two notes.

IT Architect
constants
assignment
Anonymous authorat Mar 21, 2022
Medium
2 votes397 runs
3 comments

Write a C program to calculate the total number of sweets.

IT Architect
printf
error
Anonymous authorat Mar 21, 2022
Easy
1 vote436 runs1 comment

What does the following code refer to: C:\ProgramFiles\QtCreator\text.txt ?

IT Architect
strings
file
Anonymous authorat Dec 13, 2023
Easy
1 vote411 runs0 comment

Write a C program that prints the number of years a child needs to grow to be able to ride a roller coaster.

IT Architect
loops
variables
Anonymous authorat Apr 6, 2022
Medium
1 vote35 runs0 comment

What can be problematic in this code ?

IT Architect
c
functions
Anonymous authorat Apr 6, 2022
Easy
0 vote461 runs0 comment

What does the following block of statements do?

IT Architect
preprocessor
include
Anonymous authorat Apr 6, 2022
Medium
0 vote455 runs1 comment

Write a C program that prints the number of bottles of soda you need to bring to a party.

IT Architect
variables
arithmetic
Anonymous authorat Jan 2, 2024
Easy
0 vote444 runs0 comment

What is a file .o?

IT Architect
object file
compilation
Anonymous authorat Sep 19, 2022
Easy
0 vote432 runs
2 comments

What can we say about the variable a?

IT Architect
variables
scope
Anonymous authorat Apr 6, 2022
Easy
0 vote428 runs1 comment

How is the variable 'p' initialized?

IT Architect
pointers
memory
Anonymous authorat Jan 2, 2024
Easy
0 vote422 runs0 comment

What type is the variable 'p'?

IT Architect
pointers
Anonymous authorat Mar 21, 2022
Easy
0 vote417 runs0 comment

How do you recognize preprocessor directives in C?

IT Architect
preprocessor
directives
Anonymous authorat Mar 21, 2022
Easy
0 vote405 runs0 comment

What type is the variable returned by the following function?

IT Architect
functions
void
Anonymous authorat Apr 6, 2022
Medium
0 vote329 runs0 comment

What are preprocessor directives for?

IT Architect
preprocessor
directives
Anonymous authorat Mar 21, 2022
Medium
0 vote238 runs0 comment

Find the correct value to replace the question mark in the following instruction if the word to stocke is 'Hello' (the word is not retrieved by keyboard input)

IT Architect
arrays
strings
Anonymous authorat Mar 21, 2022
Easy
0 vote172 runs0 comment

When is it useful to use a 'do... while' loop?

IT Architect
loops
Anonymous authorat Mar 27, 2023