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C Online Test

The C online test uses a range of MCQs and coding questions to evaluate candidates on their fundamental knowledge of C programming concepts, including data types, control statements, arrays, pointers, functions, and file handling. Additionally, the test assesses candidates' ability to work with dynamic memory allocation, structures, and advanced C programming concepts such as preprocessor directives and macros.

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Screen candidates with a 40 mins test

Test duration:  40 mins
Difficulty level:  Moderate
Availability:  Ready to use
Questions:
  • 6 C MCQs
  • 1 C Coding Question
Covered skills:
C Programming
Variables and Data Types
Operators
Control Structures
Functions
Arrays
Strings
Pointers
Structures and Unions
File Handling
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Adaface is used by 1500+ businesses in 80 countries.

Adaface skill assessments measure on-the-job skills of candidates, providing employers with an accurate tool for screening potential hires.

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Use the C Test to shortlist qualified candidates

The C Online Test helps recruiters and hiring managers identify qualified candidates from a pool of resumes, and helps in taking objective hiring decisions. It reduces the administrative overhead of interviewing too many candidates and saves time by filtering out unqualified candidates at the first step of the hiring process.

The test screens for the following skills that hiring managers look for in candidates:

  • Proficient in C Programming language
  • Thorough understanding of variables and data types in C
  • Knowledge of different operators and their usage in C
  • Familiarity with control structures such as if-else and switch-case in C
  • Ability to write functions and understand their significance in C
  • Understanding of arrays and their manipulation in C
  • Knowledge of string manipulation in C
  • Proficient in working with pointers in C
  • Understanding of structures and unions in C
  • Familiarity with file handling in C
  • Ability to problem solve and write efficient code in C
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Screen candidates with the highest quality 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.

How we design questions

These are just a small sample from our library of 15,000+ questions. The actual questions on this C Online Test will be non-googleable.

🧐 Question

Medium

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

Medium

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

Medium

Strings
Strings
Solve
What is the output of the following C code?
 image

Easy

Registration Queue
Logic
Queues
Solve
We want to register students for the next semester. All students have a receipt which shows the amount pending for the previous semester. A positive amount (or zero) represents that the student has paid extra fees, and a negative amount represents that they have pending fees to be paid. The students are in a queue for the registration. We want to arrange the students in a way such that the students who have a positive amount on the receipt get registered first as compared to the students who have a negative amount. We are given a queue in the form of an array containing the pending amount.
For example, if the initial queue is [20, 70, -40, 30, -10], then the final queue will be [20, 70, 30, -40, -10]. Note that the sequence of students should not be changed while arranging them unless required to meet the condition.
⚠️⚠️⚠️ Note:
- The first line of the input is the length of the array. The second line contains all the elements of the array.
- The input is already parsed into an array of "strings" and passed to a function. You will need to convert string to integer/number type inside the function.
- You need to "print" the final result (not return it) to pass the test cases.

For the example discussed above, the input will be:
5
20 70 -40 30 -10

Your code needs to print the following to the standard output:
20 70 30 -40 -10

Hard

Find the customer with the most spend 2
JOIN
GROUP BY
ORDER BY
Solve
Given details of customers, products, and sales, write a SQL query to find the customer with the highest spend. The customer with the highest spend is the one who has spent the most money on purchases. The query should return the full name of the customer and the total amount spent by the customer rounded off to the nearest integer.
full_name is the concatenation of first_name and last_name separated by a space. Eg:
first_name = 'Alice', last _name = 'Brown' => full_name = 'Alice Brown'
You can assume that there will always be non-empty first_name and non-empty last_name entries for all customers in the table.
 image

Medium

Visitors Count
Strings
Logic
Solve
A manager hires a staff member to keep a record of the number of men, women, and children visiting the museum daily. The staff will note W if any women visit, M for men, and C for children. You need to write code that takes the string that represents the visits and prints the count of men, woman and children. The sequencing should be in decreasing order. 
Example:

Input:
WWMMWWCCC

Expected Output: 
4W3C2M

Explanation: 
‘W’ has the highest count, then ‘C’, then ‘M’. 
⚠️⚠️⚠️ Note:
- The input is already parsed and passed to a function.
- You need to "print" the final result (not return it) to pass the test cases.
- If the input is- “MMW”, then the expected output is "2M1W" since there is no ‘C’.
- If any of them have the same count, the output should follow this order - M, W, C.
🧐 Question🔧 Skill

Medium

Memory Allocation

2 mins

C
Solve

Medium

Pointers and Structs

2 mins

C
Solve

Medium

Strings
Strings

2 mins

C
Solve

Easy

Registration Queue
Logic
Queues

30 mins

Coding
Solve

Hard

Find the customer with the most spend 2
JOIN
GROUP BY
ORDER BY

10 mins

SQL
Solve

Medium

Visitors Count
Strings
Logic

30 mins

Coding
Solve
🧐 Question🔧 Skill💪 Difficulty⌛ Time
Memory Allocation
C
Medium2 mins
Solve
Pointers and Structs
C
Medium2 mins
Solve
Strings
Strings
C
Medium2 mins
Solve
Registration Queue
Logic
Queues
Coding
Easy30 minsSolve
Find the customer with the most spend 2
JOIN
GROUP BY
ORDER BY
SQL
Hard10 minsSolve
Visitors Count
Strings
Logic
Coding
Medium30 minsSolve

Test candidates on core C Hiring Test topics

C Programming: C Programming is a programming language commonly used for system programming and low-level computer operations. It is essential to measure this skill in the test to assess a candidate's ability to write efficient and optimized code using C language.

Variables and Data Types: Variables and Data Types are fundamental concepts in programming. This skill should be measured in the test to evaluate a candidate's knowledge of different variable types, their declaration, and their usage in C programming.

Operators: Operators are symbols that perform specific operations on one or more operands. Measuring this skill in the test helps assess a candidate's understanding and proficiency in using arithmetic, relational, logical, and bitwise operators in C programming.

Control Structures: Control Structures are statements that control the flow of execution in a program. This skill is measured in the test to evaluate a candidate's ability to construct and use conditional statements, loops, and branching structures to achieve desired program behavior.

Functions: Functions are self-contained blocks of code that perform specific tasks. Measuring this skill in the test helps assess a candidate's understanding of function declaration, definition, invocation, parameters, return types, and their role in modular programming using C language.

Arrays: Arrays are collections of similar data types stored in a contiguous memory location. This skill should be measured in the test to evaluate a candidate's knowledge of array declaration, initialization, accessing elements, and their applications in storing and manipulating a fixed number of values.

Strings: Strings are sequences of characters in C programming. Measuring this skill in the test helps assess a candidate's understanding of string manipulation, handling, concatenation, comparison, and their usage in various applications involving text processing.

Pointers: Pointers are variables that hold memory addresses of other variables. This skill is measured in the test to evaluate a candidate's knowledge of pointer declaration, arithmetic, dereferencing, dynamic memory allocation, and their importance in memory management and efficient data access in C programming.

Structures and Unions: Structures and Unions are user-defined data types that allow combining different data types into a single entity. Measuring this skill in the test helps assess a candidate's understanding of creating and manipulating structures and unions, accessing their members, and their role in organizing and representing complex data in C programming.

File Handling: File Handling involves performing operations on files, such as reading, writing, and modifying their contents. Measuring this skill in the test evaluates a candidate's knowledge of file handling functions, file opening modes, and their ability to perform file I/O operations in C programming.

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Have questions about the C Hiring Test?

How does pricing work?

You can check out our pricing plans.

Can I customize the test?

Yes, absolutely. Custom assessments are set up within 48 hours based on your job description, and will include questions on all must-have skills you specify. Here's a quick guide on how you can request a custom test. You can also customize a test by uploading your own questions.

Can I combine multiple skills into one test?

Yes, absolutely. Custom assessments are set up based on your job description, and will include questions on all must-have skills you specify. Here's a quick guide on how you can request a custom test.

What roles can I use the C Test for?

Here are few roles for which we recommend this test:

  • Core C Developer
  • Software Engineer (C)
  • Embedded Systems Engineer
  • Game Developer
  • Network Engineer
  • Security Analyst
Can I see a sample test, or do you have a free trial?

Yes!

The free trial includes one sample technical test (Java/ JavaScript) and one sample aptitude test 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 giving a test on Adaface.

You can preview any of the 500+ tests and see the sample questions to decide if it would be a good fit for your requirements.

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.

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.

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