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.

Covered skills:

C Programming
Variables and Data Types
Operators
Control Structures
Functions
Arrays
Strings
Pointers
Structures and Unions
File Handling

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About the C Test

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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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.

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 Memory Management Pointer Usage Resource Handling	Solve
Check the following three C functions: Which among these will likely cause issues with pointers?
Medium Pointers and Structs Syntax Pointers Structs	Solve
What is the output of the following C code?
Medium Strings Strings String Manipulation Pointer Arithmetic C Programming	Solve
What is the output of the following C code?
Easy Registration Queue Logic Queues Sorting By Custom Order	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
Medium Visitors Count Strings Logic String Parsing Character Counting	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 Memory Management Pointer Usage Resource Handling	2 mins C	Solve
Check the following three C functions: Which among these will likely cause issues with pointers?
	Medium Pointers and Structs Syntax Pointers Structs	2 mins C	Solve
What is the output of the following C code?
	Medium Strings Strings String Manipulation Pointer Arithmetic C Programming	2 mins C	Solve
What is the output of the following C code?
	Easy Registration Queue Logic Queues Sorting By Custom Order	30 mins Coding	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
	Medium Visitors Count Strings Logic String Parsing Character Counting	30 mins Coding	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	💪 Difficulty	⌛ Time
	Memory Allocation Memory Management Pointer Usage Resource Handling	C	Medium	2 mins	Solve
Check the following three C functions: Which among these will likely cause issues with pointers?
	Pointers and Structs Syntax Pointers Structs	C	Medium	2 mins	Solve
What is the output of the following C code?
	Strings Strings String Manipulation Pointer Arithmetic C Programming	C	Medium	2 mins	Solve
What is the output of the following C code?
	Registration Queue Logic Queues Sorting By Custom Order	Coding	Easy	30 mins	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
	Visitors Count Strings Logic String Parsing Character Counting	Coding	Medium	30 mins	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.

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Why you should use Pre-employment C Online Test?

The C Online Test makes use of scenario-based questions to test for on-the-job skills as opposed to theoretical knowledge, ensuring that candidates who do well on this screening test have the relavant skills. The questions are designed to covered following on-the-job aspects:

C programming skills including data types, variables, operators, control structures, functions, arrays, strings, pointers, structures, unions, and file handling
In-depth knowledge of C syntax and code structure
Ability to write efficient and optimized C code
Experience in debugging and troubleshooting C programs
Understanding of memory management in C
Proficiency in using C libraries and APIs
Expertise in working with multi-dimensional arrays in C
Understanding of file handling operations in C
Ability to implement complex algorithms in C
Experience with error handling and exception management in C

Once the test is sent to a candidate, the candidate receives a link in email to take the test. For each candidate, you will receive a detailed report with skills breakdown and benchmarks to shortlist the top candidates from your pool.

What topics are covered in the C Online Test?

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.

Full list of covered topics

The actual topics of the questions in the final test will depend on your job description and requirements. However, here's a list of topics you can expect the questions for C Online Test to be based on.

C Variables

Primitive Data Types

Type Conversion

Arithmetic Operators

Relational Operators

Logical Operators

Bitwise Operators

Assignment Operators

Conditional Statements

Looping Statements

Functions in C

Recursion

Arrays in C

Strings in C

Pointers in C

Dynamic Memory Allocation

Structures in C

Unions in C

File Input/Output in C

Preprocessor Directives

Error Handling

Debugging Techniques

Code Optimization

Algorithmic Complexity

Data Structures

Memory Management

Multi-threading

Networking

Object-Oriented Programming Concepts in C

Command Line Arguments

Makefiles

Static Libraries

Dynamic Libraries

Coding Standards

Testing and Debugging

Integrated Development Environments (IDEs)

Version Control Systems

Secure Coding Practices

Code Review

Documentation

Code Reusability

Performance Analysis

Error Handling and Exceptions

Real-time Systems

Embedded Systems

Operating Systems Concepts

Computer Organization and Architecture

Data Representation

Binary Number System

Hexadecimal Number System

ASCII Encoding

Endianess

Endian Conversion

Character Encoding

Firmware Development

Low-Level Programming

Software Development Life Cycle (SDLC)

Agile Development

Waterfall Model

Spiral Model

Prototyping Model

Iterative Model

What roles can I use the C Online Test for?

Core C Developer
Software Engineer (C)
Embedded Systems Engineer
Game Developer
Network Engineer
Security Analyst

How is the C Online Test customized for senior candidates?

For intermediate/ experienced candidates, we customize the assessment questions to include advanced topics and increase the difficulty level of the questions. This might include adding questions on topics like

Knowledge of object-oriented programming concepts in C
Familiarity with dynamic memory allocation in C
Proficiency in using bitwise operators in C
Understanding of recursion and recursive functions in C
Knowledge of pointers and their manipulation in C
Experience with handling strings and string manipulation in C
Ability to work with structures and unions in C
Understanding of input/output operations in C
Experience in implementing data structures in C
Knowledge of advanced topics such as function pointers and macros in C
Proficiency in using the preprocessor directives and conditional compilation in C

The coding question for experienced candidates will be of a higher difficulty level to evaluate more hands-on experience.

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Custom Questions

Ready-to-use Tests

Custom Tests

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Multiple Question Sets

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Role-based Access

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Have questions about the C Hiring Test?

What is C Online Test?

The C Online Test is designed to evaluate a candidate's proficiency in C programming. It is used by recruiters to screen candidates for roles that require strong skills in C.

Can I combine C Online Test with C++ questions?

Yes, recruiters can request a custom test that includes both C and C++ questions. For more details on how we assess C++ skills, check out our C++ Online Test.

What topics are evaluated in the C Online Test?

The test covers various topics, including variables, data types, operators, control structures, functions, arrays, strings, pointers, structures and unions, and file handling.

How to use the C Online Test in my hiring process?

We recommend using this test as a pre-screening tool. Add a link to the test in your job post or invite candidates by email. Adaface helps you find skilled candidates faster.

Can I test C and Embedded C together in a test?

Yes, you can combine C and Embedded C in a single test. This is recommended for roles requiring both skills. Check out our Embedded C Test for more details.

What are the main C programming tests?

We offer several C programming tests:

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. Here's a quick guide on how you can request a custom test.

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

We have the following anti-cheating features in place:

Hidden AI Tools Detection with Honestly
Non-googleable questions
IP proctoring
Screen proctoring
Web proctoring
Webcam proctoring
Plagiarism detection
Secure browser
Copy paste protection

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.

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Along with scorecards that report the performance of the candidate in detail, you also receive a comparative analysis against the company average and industry standards.

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