C (Coding): Data Structures & Objects Test

The C (Coding): Data Structures & Objects Test evaluates a candidate's proficiency in C programming with a focus on data structures and object-oriented concepts. It assesses knowledge of fundamental data structures, algorithms, and C language syntax through MCQs. The test includes coding questions to evaluate practical skills in implementing efficient data structures and solving complex problems using C.

Covered skills:

Data Structures in C
Object Oriented Programming Concepts
Memory Allocation in C
Pointers Usage and Operations
Structures and Unions in C
File Handling in C
Algorithms and Complexity
C Standard Library Functions
Error Handling in C
Control Flow in C
Functions and Recursion
Manipulating Strings in C

Test Duration

30 mins

Difficulty Level

Moderate

Questions

5 C MCQs
1 C Coding Question

Availability

Ready to use

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About the C (Coding): Data Structures & Objects Assessment Test

The C (Coding): Data Structures & Objects 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:

Able to apply data structures to solve problems effectively
Proficient in understanding and implementing object-oriented programming principles
Capable of managing dynamic memory using allocation and deallocation techniques
Skilled in using pointers for accessing and manipulating memory
Competent in defining and utilizing structures and unions for data management
Adept at handling files for reading and writing data operations
Knows how to analyze algorithms for efficiency and complexity
Familiar with leveraging C Standard Library functions effectively
Able to handle exceptions and errors gracefully
Understands control flow constructs for structuring operations
Proficient in designing and implementing recursive functions
Capable of manipulating and processing strings efficiently

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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 (Coding): Data Structures & Objects Test will be non-googleable.

🧐 Question
Hard Signal Network	Solve
A secret communication network is built between cities. Each city sends out signals to others, but signals can only flow forward from a city with a lower signal strength to one with a higher signal strength. You are given: 1. An array "signals" where "signals[i]" represents the strength of city 'i'. 2. A list of "connections" (edges), where each connection [u, v] means a directed link from city 'u' to city 'v'. You must find the longest possible chain of cities where: 1. Each city is connected to the next (via directed edges). 2. The signal strengths are strictly increasing along the chain. Input: 1. An integer n → number of cities 2. An array signals of length n 3. An array of edges (directed connections between cities) Output: Print the length of the longest increasing-signal chain. Example: Input: n = 6 signals = [2, 4, 3, 5, 1, 6] edges = [[0,1], [0,2], [2,3], [1,3], [3,5], [4,0]] Output: 4 Explanation: Optimal path: 4 → 0 → 2 → 3 → 5 Signal strengths (strictly increasing) for the path: 1 → 2 → 3 → 5 → 6 Length: 5
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
	Hard Signal Network	30 mins Coding	Solve
A secret communication network is built between cities. Each city sends out signals to others, but signals can only flow forward from a city with a lower signal strength to one with a higher signal strength. You are given: 1. An array "signals" where "signals[i]" represents the strength of city 'i'. 2. A list of "connections" (edges), where each connection [u, v] means a directed link from city 'u' to city 'v'. You must find the longest possible chain of cities where: 1. Each city is connected to the next (via directed edges). 2. The signal strengths are strictly increasing along the chain. Input: 1. An integer n → number of cities 2. An array signals of length n 3. An array of edges (directed connections between cities) Output: Print the length of the longest increasing-signal chain. Example: Input: n = 6 signals = [2, 4, 3, 5, 1, 6] edges = [[0,1], [0,2], [2,3], [1,3], [3,5], [4,0]] Output: 4 Explanation: Optimal path: 4 → 0 → 2 → 3 → 5 Signal strengths (strictly increasing) for the path: 1 → 2 → 3 → 5 → 6 Length: 5
	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
	Signal Network	Coding	Hard	30 mins	Solve
A secret communication network is built between cities. Each city sends out signals to others, but signals can only flow forward from a city with a lower signal strength to one with a higher signal strength. You are given: 1. An array "signals" where "signals[i]" represents the strength of city 'i'. 2. A list of "connections" (edges), where each connection [u, v] means a directed link from city 'u' to city 'v'. You must find the longest possible chain of cities where: 1. Each city is connected to the next (via directed edges). 2. The signal strengths are strictly increasing along the chain. Input: 1. An integer n → number of cities 2. An array signals of length n 3. An array of edges (directed connections between cities) Output: Print the length of the longest increasing-signal chain. Example: Input: n = 6 signals = [2, 4, 3, 5, 1, 6] edges = [[0,1], [0,2], [2,3], [1,3], [3,5], [4,0]] Output: 4 Explanation: Optimal path: 4 → 0 → 2 → 3 → 5 Signal strengths (strictly increasing) for the path: 1 → 2 → 3 → 5 → 6 Length: 5
	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 (Coding): Data Structures & Objects Test?

The C (Coding): Data Structures & Objects 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:

Understanding basic syntax and structure of C.
Implementing fundamental control structures in C.
Using pointers for memory management.
Applying structures to organize complex data.
Working with standard I/O library functions.
Writing functions and implementing recursion.
Manipulating strings using C standard functions.
Developing basic algorithms using C.
Understanding and writing basic file handling.
Performing error checking and handling 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 (Coding): Data Structures & Objects Test?

Data Structures in C: Data structures in C are fundamental programming constructs used to store and organize data in an efficient manner. Understanding their implementation is crucial for optimizing performance and achieving fast algorithms. This skill evaluates a candidate's capability to utilize arrays, linked lists, stacks, queues, trees, and hash tables to solve complex problems.

Object Oriented Programming Concepts: Object Oriented Programming (OOP) in C involves understanding how to emulate OOP principles, such as encapsulation, inheritance, and polymorphism, using structures and function pointers. Given C is not natively object-oriented, knowledge of these concepts is critical for designing modular and maintainable applications.

Memory Allocation in C: Memory allocation in C refers to the process of dynamically allocating memory during runtime using functions like malloc(), calloc(), realloc(), and free(). Efficient memory handling is indispensable for C programmers to prevent leaks and optimize resource usage in applications.

Pointers Usage and Operations: Pointers allow direct manipulation of memory addresses, making them a powerful yet complex aspect of C programming. Proficiency in pointers is necessary due to their role in dynamic data structures, memory allocation, and facilitating references and dereferences.

Structures and Unions in C: Structures and unions are used to group related variables of different datatypes under one umbrella. They form the backbone of organizing large amounts of data, enabling programmers to model complex data more effectively.

File Handling in C: C provides file handling capabilities to perform file operations such as reading, writing, and closing files. Mastery in file handling is essential for applications that involve persistent storage, data serialization, and user data processing.

Algorithms and Complexity: Understanding algorithms and their complexities allows developers to devise efficient solutions that scale well with input size increases. The skill assessment here focuses on both implementing algorithms and evaluating their space-time trade-offs.

C Standard Library Functions: The C Standard Library provides a suite of pre-defined functions for input/output, string manipulation, mathematical computations, and more. Utilizing these functions proficiently can greatly enhance a developer's productivity and code reliability.

Error Handling in C: Error handling in C involves detecting, managing, and responding to errors during program execution. Accurate error handling is crucial in preventing unexpected system behavior and ensuring robust and reliable software.

Control Flow in C: Control flow determines the order in which individual statements, instructions, or function calls are executed. It is essential for creating logic within applications that can handle various conditions and decision-making paths.

Functions and Recursion: Functions allow the decomposition of a program into manageable blocks, promoting code reuse and clarity. Recursion, a function calling itself, provides elegant solutions to complex problems and it’s vital for solving problems that exhibit overlapping subproblems and optimal substructure properties.

Manipulating Strings in C: String manipulation in C emphasizes handling sequences of characters efficiently through operations such as copying, concatenation, comparison, and searching. Strings are central to user interfaces and data processing workflows.

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 (Coding): Data Structures & Objects Test to be based on.

Arrays

Linked Lists

Stacks

Queues

Binary Trees

Graphs

Hash Tables

OOP Principles

Classes

Inheritance

Memory Allocation

Dynamic Memory

Pointers

Pointer Arithmetic

Structures

Unions

File Operations

File Reading

File Writing

Algorithm Analysis

Big O Notation

Sorting Algorithms

Searching Algorithms

C Standard Library

Standard Input

Standard Output

Error Codes

Exception Handling

If-Else Statements

Loops

For Loop

While Loop

Do-While Loop

Functions

Recursion

String Functions

String Manipulation

Character Arrays

Macros

Preprocessor

Compiler Directives

Bitwise Operations

Type Casting

Function Pointers

Constant Qualifier

Volatile Keyword

Scope Rules

Block Scope

Global Scope

Static Variables

What roles can I use the C (Coding): Data Structures & Objects Test for?

Software Developer
C Programmer
Embedded Systems Engineer
Systems Programmer
Game Developer
Algorithm Engineer
Backend Developer
Data Structures Specialist
Low-Level Systems Developer
Software Engineer

How is the C (Coding): Data Structures & Objects 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

Implementing advanced data structures in C.
Manipulating data using structures and unions.
Applying object-oriented principles in C.
Optimizing memory allocation and deallocation.
Utilizing pointers for complex data operations.
Designing algorithms with efficiency in mind.
Implementing complex control flows and logic.
Creating modular and reusable code.
Integrating C code with other systems.
Debugging and profiling C programs.

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

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Have questions about the C (Coding): Data Structures & Objects Hiring Test?

What is C (Coding): Data Structures & Objects Test?

The C (Coding): Data Structures & Objects Test assesses candidates' skills in data structures and object-oriented programming using C. It is utilized by recruiters to evaluate the technical proficiency of candidates.

Can I combine C (Coding): Data Structures & Objects Test with C# & .NET questions?

Yes, recruiters can request a single custom test with multiple skills in the same test. For more details on how we assess C# & .NET, refer to the C# & .NET Test.

What topics are evaluated in this test?

This test covers Arrays and Strings, Linked Lists, Stacks and Queues, Trees and Graphs, Hash Tables, Sorting Algorithms, Searching Algorithms, Dynamic Programming, Object-Oriented Programming, Memory Management, Time and Space Complexity, and C Language Syntax.

How to use C (Coding): Data Structures & Objects Test in my hiring process?

Use this test as a pre-screening tool at the beginning of your recruitment process. Add a link to the assessment in your job post or invite candidates by email. Adaface helps identify skilled candidates early and faster.

Can I test C (Coding): Data Structures & Objects and C Online Test together?

Yes, you can combine these tests to assess a wider range of skills. This combination is recommended for a comprehensive evaluation. Refer to the C Online Test for more details.

What are the main coding tests?

The main coding tests include:

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.

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