C Online Test

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About the test

The C online test assesses knowledge of programming in the C language through a series of live coding questions.

The assessment includes work-sample tasks such as:

  • Using pointers to reference a location in memory.
  • Implementing and properly using data structures and algorithms.
  • Optimizing memory management and fixing memory leaks.

A good C developer needs a solid understanding of the C programming language and the implications of low-level optimizations to work on complex or performance critical code.

Sample public questions

Easy
10 min
code
Public
C
Arithmetic

Implement the function find_roots to find the roots of the quadratic equation: ax2 + bx + c = 0. The function can assign the roots to the values pointed by root1 and root2 in any order. If the equation has only one solution, the function should assign 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, find_roots(2, 10, 8) should assign -1,-4 or -4 and -1 to the values pointed by root1 and root2 as the roots of the equation 2x2 + 10x + 8 = 0 are -1 and -4.

Easy
10 min
code
Public
C
Arrays
Pointers

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.

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23 more premium C questions

Square, Descriptor, Copy Bit, Shipping, Max Sum, Init Range, Increment, Internal Nodes, Battery, Strings Pointer, Allocate String, Count Letters, Segment, Tiles, Read Write Execute, Weighted Average, Node, Racer, Sort Params, Run in Parallel, Chain Link, Paper Strip, Vectors.

Skills and topics tested

  • C
  • Pointers
  • Memory Management
  • Bit Manipulation
  • Arithmetic
  • Algorithmic Thinking
  • Arrays
  • Tree
  • Language
  • Pointer to Pointer
  • Strings
  • 2D Array
  • Pass by Reference
  • Bug Fixing
  • Recursion
  • Multithreading
  • Synchronization
  • Higher Order Function
  • Pthreads
  • Linked List
  • Iteration

For job roles

  • Back-End Developer
  • C Developer

Sample candidate report

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