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C Online Test

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The C online test assesses candidates' knowledge of programming in the C language.

It's an ideal test for pre-employment screening. A good C developer needs to be able not only to solve problems using C but also understand the implications of low level optimizations.

This online test requires candidates to solve coding problems in C.

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Free Sample Questions for C Test

Our sample questions are free for companies to use on a trial plan. See more about our premium questions for paid plans below.

Quadratic Equation

10min
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Easy  
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CODE

C Arithmetic Public New

Implement the function find_roots to find the roots of the quadratic equation: ax2 + bx + c = 0. If the equation has only one solution, the function should return that solution as both roots. The equation will always have at least one solution.

The roots of the quadratic equation can be found with the following formula: A quadratic equation.

For example, the roots of the equation 2x2 + 10x + 8 = 0 are -1 and -4.

Watched Videos

10min
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Easy  
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CODE

C Arrays Pointers Public

Implement the count_views function. It accepts an array of pointers to the Viewer struct, the size of the array, and the character array with the video name. It should return the number of Viewers who have watched a Video with the name video_name.

For example,

Video videos[] = { {.name = "Soccer", .unique_views = 500},
                   {.name = "Basketball", .unique_views = 1000} };
Viewer viewer = {.username = "Dave", .watched_videos = videos,
                 .watched_videos_size = 2};    
Viewer *viewers[] = { &viewer };

calling count_views(viewers, 1, "Soccer") should return 1.

Words

10min
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Easy  
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CODE

C Algorithmic thinking Sorting Public

Implement function sort_words that sorts an array of words that contain lowercase characters from english alphabet, in descending order, and is efficient with respect to time used.

For example, the array { "cherry", "orange", "apple" } should, after sorting, become { "orange", "cherry", "apple" }.

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Premium Questions for C Test

TestDome offers a premium questions library with 1000+ unique, hand-crafted questions whose answers can’t be found online. If you spot an answer somewhere online, we’ll give you a refund.

Question Names

These premium questions are included in this pre-built test and can be added to any multi-skill test. Please sign up for a paid plan to view the questions in detail.

Allocate String, Copy Bit, Shipping, Init Range, Read Write Execute, Segment, Square, Username, Battery, Increment, Strings Pointer, Count Letters, Run in Parallel, Max Sum, Tiles, Descriptor, Increment, Internal Nodes
Covered Skills

Testing of these skills is covered in this pre-built test because they’re closely related. On our paid plan, you can easily create your own custom multi-skill tests.

C Memory management Bit manipulation Arithmetic Strings Pointers Regex Language Pointer to pointer Higher order function Multithreading Algorithmic thinking 2D array Pass by reference Arrays Tree
Recommended Job Roles

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Back-End Developer
C Developer

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