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About the test:

The C Online Test is preferred by recruiters to assess on-the-job skills of candidates before an interview. It reduces technical screening time by 80% by enabling employers to identify qualified candidates.

Covered skills:

  • Variable Naming
  • Structures
  • Handling Datatypes
  • Functions
See all covered skills

9 reasons why
9 reasons why

Adaface C Online Test is the most accurate way to shortlist Core C Developers

Reason #1

Tests for on-the-job skills

C online test is designed and validated by industry experts to help tech recruiters and hiring managers assess C programming skills of the candidate. Top tech companies are using our JavaScript programming test to reduce candidate screening time by 85%.

The test is designed to filter out candidates for roles like

  • Junior C developer
  • C developer
  • Intermediate C developer
  • Senior C developer
  • Backend developer

The test ensures candidates have following traits:

  • Ability to write reusable C code
  • Proficiency in Data Structures
  • Deep knowledge of Pointers, Structures and Unions
  • Excellent knowledge of frontend programming languages and related frameworks
  • Ability to identify areas for modification in existing programs and subsequently developing these modifications
  • Hands-on debugging and development skills
  • Experience integrating multiple data sources and databases
  • Ability to perform modifications and break fixes with VBA code and C programs
  • Experience with writing unit and functional tests

C Online Test is designed mainly to assess candidates having high ability in C coding, and knowledge of various functions. In this test, the programmer will need to write code using C coding language.

For each candidate, you will receive a detailed report to help you make objective, data driven decisions and identify the best candidates. The test focuses on questions that test for on-the-job C skills as opposed to theoretical knowledge.

Reason #2

No trick questions

Traditional assessment tools use trick questions and puzzles for the screening, which creates a lot of frustration among candidates about having to go through irrelevant screening assessments.

The main reason we started Adaface is that traditional pre-employment assessment platforms are not a fair way for companies to evaluate candidates. At Adaface, our mission is to help companies find great candidates by assessing on-the-job skills required for a role.

Why we started Adaface ->
Reason #3

Non-googleable questions

We have a very high focus on the quality of questions that test for on-the-job skills. Every question is non-googleable and we have a very high bar for the level of subject matter experts we onboard to create these questions. We have crawlers to check if any of the questions are leaked online. If/ when a question gets leaked, we get an alert. We change the question for you & let you know.

These are just a small sample from our library of 10,000+ questions. The actual questions on this C Online Test will be non-googleable.

🧐 Question


Memory Allocation
                        Check the following three C functions:
                        Which among these will likely cause issues with pointers?


  • A
  • B
  • C
  • A B
  • A C
  • B C
  • A B C
  • None of them


Pointers and Structs
                        What is the output of the following C code?


  • 1 2 3 4 1 2 4 5
  • 1 2 3 4 5 5 4 5
  • 1 2 3 4 3 4 5 5
  • 1 2 3 4 4 5 3 4


                        What is the output of the following C code?


  • pbls
  • pebles
  • pebbep
  • selbbep
  • selbbles
  • epbbels
  • ppeeblleess


Longest Road
                        A startup company E-Motors is building driverless automated cars. The car contains a sensor that checks the road quality for the next N meters to decide the optimal speed at which the cars should move. We are given recorded data by the sensor in the form of an array, where each element of the array is the rating given to 1 meter of the road in sequence. 

The rating given by the sensor is from 1 to 100, where 100 represents the road with the best condition, and any rating above 60 is optimal. Find the longest stretch of road in meters that is categorized as optimal by the sensor.

The input is an array of "strings" which needs to be converted from string to integer/number inside the function.
    🧐 Question🔧 Skill


    Memory Allocation
    2 mins


    Pointers and Structs
    2 mins


    2 mins


    Longest Road
    25 mins
    🧐 Question🔧 Skill💪 Difficulty⌛ Time
    Memory Allocation
    Medium2 mins
    Pointers and Structs
    Medium2 mins
    Medium2 mins
    Longest Road
    Medium25 minsSolve
    Reason #4

    1200+ customers in 75 countries


    With Adaface, we were able to optimise our initial screening process by upwards of 75%, freeing up precious time for both hiring managers and our talent acquisition team alike!

    Brandon Lee, Head of People, Love, Bonito

    Reason #5

    1 click candidate invites

    Email invites: You can send candidates an email invite to the C Online Test from your dashboard by entering their email address.

    Public link: You can create a public link for each test that you can share with candidates.

    API or integrations: You can invite candidates directly from your ATS by using our pre-built integrations with popular ATS systems or building a custom integration with your in-house ATS.

    Reason #6

    Detailed scorecards & comparative results

    Reason #7

    Designed for elimination, not selection

    The most important thing while implementing the pre-employment C Online Test in your hiring process is that it is an elimination tool, not a selection tool. In other words: you want to use the test to eliminate the candidates who do poorly on the test, not to select the candidates who come out at the top. While they are super valuable, pre-employment tests do not paint the entire picture of a candidate’s abilities, knowledge, and motivations. Multiple easy questions are more predictive of a candidate's ability than fewer hard questions. Harder questions are often "trick" based questions, which do not provide any meaningful signal about the candidate's skillset.

    Reason #8

    High completion rate

    Adaface tests are conversational, low-stress, and take just 25-40 mins to complete.

    This is why Adaface has the highest test-completion rate (86%), which is more than 2x better than traditional assessments.

    Reason #9

    Advanced Proctoring

    About The C Developer Role

    C is a general-purpose, procedural computer programming language supporting structured programming, lexical variable scope, and recursion, while a static type system prevents unintended operations.

    C Developers are generally responsible for developing code that integrates into the operating systems, operating system modules, embedded systems, or low-level libraries for other high-level languages such as Node.js, Python, and Go.

    Typical responsibilities of a C developer would be:

    • Design, build, and maintain efficient, reusable, and reliable C code
    • Identify process bottlenecks and bugs
    • Develop kernel modules, libraries, and embedded systems for other high-level languages
    • Maintain the automation and quality of the code

    What roles can I use the C Online Test for?

    • Core C Developer
    • Core C Programmer
    • Backend Developer

    What topics are covered in the C Online Test?

    Functions & Recursion
    Algorithmic Thinking
    Constant Variables & Data Types
    I/O Operations
    Structures & Union
    2D Array
    Problem Solving
    Decision Making & Looping
    Section Test
    Memory Management
    Pointer to Pointer
    File Management
    Operators & Expressions
    Bit manipulation
    Variable Naming
    Handling Datatypes
    Looping and Conditional statements
    File Handling
    System level operations using inbuilt headers
    Singapore government logo

    The hiring managers felt that through the technical questions that they asked during the panel interviews, they were able to tell which candidates had better scores, and differentiated with those who did not score as well. They are highly satisfied with the quality of candidates shortlisted with the Adaface screening.

    reduction in screening time


    Can I combine multiple skills into one custom assessment?

    Yes, absolutely. Custom assessments are set up based on your job description, and will include questions on all must-have skills you specify.

    Do you have any anti-cheating or proctoring features in place?

    We have the following anti-cheating features in place:

    • Non-googleable questions
    • IP proctoring
    • Web proctoring
    • Webcam proctoring
    • Plagiarism detection
    • Secure browser

    Read more about the proctoring features.

    How do I interpret test scores?

    The primary thing to keep in mind is that an assessment is an elimination tool, not a selection tool. A skills assessment is optimized to help you eliminate candidates who are not technically qualified for the role, it is not optimized to help you find the best candidate for the role. So the ideal way to use an assessment is to decide a threshold score (typically 55%, we help you benchmark) and invite all candidates who score above the threshold for the next rounds of interview.

    What experience level can I use this test for?

    Each Adaface assessment is customized to your job description/ ideal candidate persona (our subject matter experts will pick the right questions for your assessment from our library of 10000+ questions). This assessment can be customized for any experience level.

    Does every candidate get the same questions?

    Yes, it makes it much easier for you to compare candidates. Options for MCQ questions and the order of questions are randomized. We have anti-cheating/ proctoring features in place. In our enterprise plan, we also have the option to create multiple versions of the same assessment with questions of similar difficulty levels.

    I'm a candidate. Can I try a practice test?

    No. Unfortunately, we do not support practice tests at the moment. However, you can use our sample questions for practice.

    What is the cost of using this test?

    You can check out our pricing plans.

    Can I get a free trial?

    Yes, you can sign up for free and preview this test.

    I just moved to a paid plan. How can I request a custom assessment?

    Here is a quick guide on how to request a custom assessment on Adaface.

    Join 1200+ companies in 75+ countries.
    Try the most candidate friendly skills assessment tool today.
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    Ready to use the Adaface C Online Test?
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