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

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 .

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: C Online Test C++ Online Test Embedded C Test

C Online Test

Q: 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.

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

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: Which among these will likely cause issues with pointers?
Medium Pointers and Structs	Solve
What is the output of the following C code?
Medium Strings Strings	Solve
What is the output of the following C code?
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
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
Check the following three C functions: Which among these will likely cause issues with pointers?
	Medium Pointers and Structs	2 mins C	Solve
What is the output of the following C code?
	Medium Strings Strings	2 mins C	Solve
What is the output of the following C code?
	Easy Registration Queue Logic Queues	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	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	C	Medium	2 mins	Solve
Check the following three C functions: Which among these will likely cause issues with pointers?
	Pointers and Structs	C	Medium	2 mins	Solve
What is the output of the following C code?
	Strings Strings	C	Medium	2 mins	Solve
What is the output of the following C code?
	Registration Queue Logic Queues	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	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.

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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