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C is a computer programming language that was developed by Dennis Ritchie and released in the year 1972. The original purpose of this language was to develop a system programming language that can be used to write an operating system. This general-purpose language is structured and machine-independent, which makes its applications simple and flexible. Also, other programming languages such as JavaScript, PHP, Java are based on C programming. So, C is one of the basic and essential computing languages that developers need to know.

Currently, C programming is used in numerous key applications such as embedded systems, desktop applications, graphic user interface and compilers. C language is used in the development of Google’s Chromium browser and other browsers as well as Adobe applications and products. This structured language also forms a pivotal part of databases as MySQL is built using C. Microsoft Windows, Symbian, Apple OS X as well as numerous mobile operating systems are built using C language. This language also finds application in IoT applications. With such a wide range of applications, C language is a must-know for programmers, no matter which domain they work in.

Organisations that are looking to bring in good talent into their development teams should definitely look for programmers with a strong foundation and expertise in C programming language. Knowledge of C language will also make it easy for coders to learn other associated languages if required. C programming interview questions asked during face to face interviews may not always help recruiters make the right hiring decisions. So, apart from using C interview questions, recruiters should also use online assessment tests that will help evaluate a candidate’s C programming skills. The next section will give you a snapshot of the possible questions that can be asked in an online assessment test.

Frequently Asked C Interview Questions

Q1. Find out the output of the below program




   int r, x = 2;

   float y = 5;


   r = y%x;

   printf("%d", r);


  1. 0
  2. 1
  3. 2
  4. Compile error

Ans: d. Compile error

Q2. What is the binary equivalent of 50?

  1. 101
  3. 110010
  4. 1010110

Ans: c. 110010

Q3. What does sizeof() denote in C?

  1. Function
  2. Operator
  3. Macro
  4. None of the above

Ans: b. Operator

Q4. What is the output?

void main()


int a = 10/3;



  1. 3
  2. 0
  3. 3.33
  4. 3

Ans: d. 3

Q5. If the below program is run, how many times “Hello” will be printed?

void main()


int a = 0;

while(a++ < 5)



  1. 0 time
  2. 4 times
  3. 5 times
  4. Infinite times

Ans: c. 5 times

Q6. In which year was C language invented?

  1. 1970
  2. 1979
  3. 1978
  4. 1972

Ans: d. 1972

Q7. What do you call the concept of two functions that has the same name?

  1. Function overloading
  2. Function overriding
  3. Operator overloading
  4. Function renaming

Ans: a. Function overloading

Q8. You can convert C program into a machine language using

  1. Compiler
  2. Editor
  3. Operating system
  4. None of the above

Ans: a. Compiler

Q9. Which of the following functions should a C program always have?

  1. system()
  2. main()
  3. printf()
  4. start()

Ans: b. main()

Applications of MeritTrac Assessment Solutions

MeritTrac’s online assessment solutions aid your hiring and training efforts. During campus interviews, when you are assessing hundreds of students at the same time, it can be difficult to ask C language interview questions to each and every applicant. It will not only be time consuming but will also require more effort from the recruiters. An effective and more efficient alternative will be using online assessments that will contain multiple choice questions, find the output, find the error and other forms of questions.

These questions will not only evaluate a candidate’s knowledge in the programming language but also assess their expertise in coding. Hundreds of candidates can simultaneously take up the online assessment. The results can be digitally evaluated immediately and results published right away. Candidates who qualify in the assessment can be called for an interview where the hiring manager or subject matter expert can assess them further by asking complex C programming interview questions.

MeritTrac assessment solutions can also be used for internal training. As discussed above, C programming forms the basis for other programming languages as well as numerous applications. So, when your company gets a new project or if there is a requirement for a qualified coder in a new team, internal recruitment can be done using assessment solutions. If training is planned, then a pre-training assessment can help determine learning gaps. The training can then be planned based on the learning and skill gaps.

MeritTrac Platform for C Programmer Assessment

MeritTrac offers an easy-to-use assessment platform for evaluating candidate’s coding skills and expertise. The best part of using this assessment platform is that even non-technical people can administer the test. The platform comes built-in with hundreds of domain-based online coding tests. The difficulty level of questions can be customized based on the job profile and functional role. A recruiter can then easily administer the test online or on specific systems. Our platform can verify and authenticate the test takers.

Once the tests are completed, CodeTrac automatically evaluates the answers to give you the results in just a few minutes. The results are also analysed to give you a rank list and list of candidates who have cleared the predetermined threshold performance levels. Based on this list, recruiters can call in candidates for the next round of the hiring process. The other benefit of using our platform is that you have data to justify your hiring decisions. It removes personal bias from the hiring decision.

The top-notch features of CodeTrac assessment platform are:

  • Unified platform assessment
  • Full-stack software development assessment
  • Uniform coding structure
  • Project-based testing
  • Extensive programming language library
  • Auto evaluation