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C Online 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.

Customized Based On:

  • Experience/ difficulty level
  • Multiple skills in 1 assessment
  • Job description/ role requirements

Covered Topics:

Variable Naming
Handling Datatypes
Looping and Conditional statements
File Handling
System level operations using inbuilt headers
See full list
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.

Human Resources Manager

Singapore Government

reduction in screening time

Sample C Online Test Questions

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🔧 Skill💪 Difficulty⌛ Time
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
CMedium2 min
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
CMedium2 min
What is the output of the following C code?


  • pbls
  • pebles
  • pebbep
  • selbbep
  • selbbles
  • epbbels
  • ppeeblleess
CMedium2 min

How to use the Adaface C Online Test

Start screening candidates within minutes with the ready-to-go C Online Test

1. Choose the most appropriate test for your role

2. Start inviting candidates to complete the assessment

3. Receive real time notifications and shortlist the best candidates

Customize the Adaface C Online Test according to your job description

1. Get a custom assessment from our library of 500+ skills within 48 hours

2. Start inviting candidates to complete the assesment

3. Receive real time notifications and shortlist the best candidates

Adaface C Online Test is trusted by enterprises worldwide

Morgan Stanley
SG Government
Ernst and Young
Optimum Solutions
United Nations
Love Bonito

About the Adaface C Assessment Test

Evaluate C technical and coding skills with Adaface skills assessment platform powered by an intelligent chatbot


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

Recommended Roles:

Core C Developer
Core C Programmer
Backend Developer

Why You Should Use This C Online Assessment Test

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.

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

Distribution Of Test Scores

The actual score distribution will vary based on your candidate pipeline quality, but you should typically expect ~20% of the candidates to do well on Adaface assessments.

The score distribution for our assessments follow the normal curve. This is a good sign- standardized tests like SAT and GRE follow the normal distribution (bell curve).

Status quo assessments typically have the exact opposite of the bell curve (too many candidates getting close to 0, too many candidates getting close to 100 and too few candidates in the middle). This is typically because they focus on theoretical questions or trick questions, which are very binary in nature- either you know the trick/ theory or you don’t.

How Adaface Is Different

Adaface conversational assessments are reflective of on-the-job skills and see an 86% completion rate as compared to ~50% for traditional assessment platforms.



Theoretical questions/ puzzles

Feels like a test

One-size-fits-all assessments




Questions for on-the-job skills





What is a custom assessment?

Every role is different and requires a custom assessment to identify top candidates efficiently. Adaface subject matter experts understand your job description/ role requirements and pick the most relevant questions from our library of 10000+ questions to create a technical assessment that helps you find the qualified candidates in your candidate pipeline quickly. All custom assessments are set up based on the job description, role requirements, must-have skills, experience level and salary range within a maximum of 48 hours and you will get an email notification once it goes live.

Check out a sample assessment here (no credit card required).

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.

How is Adaface different from other assessment tools?

We believe that status quo tech assessment platforms are not a fair way for companies to evaluate engineers because they focus on trick questions/ puzzles/ niche algorithms. We started Adaface to help companies find great engineers by assessing on-the-job skills required for a role. Read more about why we started Adaface.

Here's what's different with Adaface:

  • High quality non-googleable questions that test for on-the-job skills as opposed to theoretical knowledge.
  • A friendly conversational assessment with a chatbot, instead of sending a "test" to a candidate. This translates to a higher completion rate. Adaface assessments (86% candidate completion rate), as opposed to traditional tests (40-50% candidate completion rate)
  • Customized assessments for 700+ skills at different experience levels.

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

We have the following anti-cheating features in place:

  • Web proctoring
  • Webcam proctoring
  • Plagairism detection
  • Non-googleable questions
  • 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?

The platform is completely self-serve, so here's one way to proceed:

  • You can sign up for free to get a feel for how it works.
  • The free trial includes one sample assessment (Java/ JavaScript) that you will find in your dashboard when you sign up. You can use it to review the quality of questions, and the candidate experience of a conversational test on Adaface.
  • To review the quality of questions, you can also review our public questions for 50+ skills here.
  • Once you're convinced that you want to try it out with real assessments and candidates, you can pick a plan according to your requirements.

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.

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

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