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45 interview questions on Language C - Fundamentalsfor developers (2025)

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
7 votes850 runs2 comments

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

IT Architect
c++
memory
Vincent Cotroat Nov 3, 2023
Medium
4 votes271 runs
1 comment

Undefined behavior.

IT Architect
memory
pointers
Abha Agrawaat Jan 2, 2024
Easy
3 votes311 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 votes167 runs0 comment

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

IT Architect
constants
assignment
Kahinaat Mar 21, 2022
Easy
2 votes352 runs2 comments

Include a .h library in C

IT Architect
header files
libraries
Kahinaat Jan 2, 2024
Easy
2 votes339 runs0 comment

Write a C function to swap two integers.

IT Architect
pointers
functions
Vincent Cotroat Mar 21, 2023
Medium
2 votes327 runs
2 comments

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

IT Architect
printf
error
Kahinaat Mar 21, 2022
Medium
1 vote359 runs1 comment

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

IT Architect
strings
file
Kahinaat Dec 13, 2023
Easy
1 vote338 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
Kahinaat Apr 6, 2022
Medium
1 vote31 runs0 comment

What can be problematic in this code ?

IT Architect
c
functions
Kahinaat Apr 6, 2022
Easy
0 vote386 runs0 comment

What does the following block of statements do?

IT Architect
preprocessor
include
Kahinaat Apr 6, 2022
Medium
0 vote382 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
Kahinaat Jan 2, 2024
Easy
0 vote372 runs0 comment

What is a file .o?

IT Architect
object file
compilation
Kahinaat Sep 19, 2022
Easy
0 vote358 runs
2 comments

What can we say about the variable a?

IT Architect
variables
scope
Kahinaat Apr 6, 2022
Easy
0 vote357 runs1 comment

How is the variable 'p' initialized?

IT Architect
pointers
memory
Kahinaat Jan 2, 2024
Easy
0 vote348 runs0 comment

What type is the variable 'p'?

IT Architect
pointers
Kahinaat Mar 21, 2022
Easy
0 vote347 runs0 comment

How do you recognize preprocessor directives in C?

IT Architect
preprocessor
directives
Kahinaat Mar 21, 2022
Easy
0 vote333 runs0 comment

What type is the variable returned by the following function?

IT Architect
functions
void
Kahinaat Apr 6, 2022
Medium
0 vote255 runs0 comment

What are preprocessor directives for?

IT Architect
preprocessor
directives
Kahinaat Mar 21, 2022
Medium
0 vote188 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
Kahinaat Mar 21, 2022