C Interview Questions and Answers, C Interview Questions and Answers Freshers, C Interview Questions and Answers, C Interview Questions

Before getting on to the C interview questions, the student must know that the C is a continuously varying field which needs the students as well as professionals to upgrade their skills with the new features and knowledge, to get fit for the jobs associated with C. This post related to C Interview Questions and Answers, C Interview Questions and Answers Freshers, C Interview Questions and Answers, C Interview Questions will help you let out find all the solutions that are frequently asked in you upcoming C interview.

Over thousands of vacancies available for the C developers, experts must be acquaintance with all the component of C technologies. This is necessary for the students in order to have in-depth knowledge of the subject so that they can have best employment opportunities in the future. Knowing every little detail about C is the best approach to solve the problems linked with problem.

APTRON has spent hours and hours in researching about the C Interview Questions and Answers, C Interview Questions and Answers Freshers, C Interview Questions and Answers, C Interview Questions that you might encounter in your upcoming interview.  All these questions will alone help you to crack the interview and make you the best among all your competitors.

First of all, let us tell you about how the C technology is evolving in today’s world and how demanding it is in the upcoming years. In fact, according to one study, most of the companies and businesses have moved to the C. Now, you cannot predict how huge the future is going to be for the people experienced in the related technologies.

Hence, if you are looking for boosting up your profile and securing your future, C will help you in reaching the zenith of your career. Apart from this, you would also have a lot of opportunities as a fresher.

These questions alone are omnipotent. Read and re-read the questions and their solutions to get accustomed to what you will be asked in the interview. These C interview questions and answers will also help you on your way to mastering the skills and will take you to the giant world where worldwide and local businesses, huge or medium, are picking up the best and quality C professionals.

This ultimate list of best C interview questions will ride you through the quick knowledge of the subject and topics like Data Types and Variables, Arrays, Pointers, Control-Flow Statements,Operands, Operators. This C interview questions and answers can be your next gateway to your next job as a C expert.

These are very Basic C Interview Questions and Answers for freshers and experienced both.

Q1: What is C language?
A1: C is a mid level and procedural programming language.

Q2: Why C is known as a mother language?
A2: C is known as a mother language because most of the compilers, kernals and JVMs are written in C language.

Q3: Why C is called a mid level programming language?
A3: It supports the feature of both low-level and high level languages that is why it is known as a mid level programming language.

Q4: Who is the founder of C language?
A4: Dennis Ritchie.

Q5: When C langauge was developed?
A5: C language was developed in 1972 at bell laboratories of AT&T.

Q6: What are the features of C language?
A6: The main features of C language are given below:

  • Simple
  • Portable
  • Mid Level
  • Structured
  • Fast Speed
  • Memory Management
  • Extensible

Q7: What is pointer to pointer in C?
A7: In case of pointer to pointer concept, one pointer refers to the address of another pointer.

Q8: What is static memory allocation?
A8: In case of static memory allocation, memory is allocated at compile time and memory can’t be increased while executing the program. It is used in array.

Q9: What is dynamic memory allocation?
A9: In case of dynamic memory allocation, memory is allocated at run time and memory can be increased while executing the program. It is used in linked list.

Q10: When should we use pointers in a C program?

  1. To get address of a variable
  2. For achieving pass by reference in C: Pointers allow different functions to share and modify their local variables.
  3. To pass large structures so that complete copy of the structure can be avoided.
  4. To implement “linked” data structures like linked lists and binary trees.

Q11: What is NULL pointer?
A11: NULL is used to indicate that the pointer doesn’t point to a valid location. Ideally, we should initialize pointers as NULL if we don’t know their value at the time of declaration. Also, we should make a pointer NULL when memory pointed by it is deallocated in the middle of a program.

Q12: How do you construct an increment statement or decrement statement in C?
A12: There are actually two ways you can do this. One is to use the increment operator ++ and decrement operator –. For example, the statement “x++” means to increment the value of x by 1. Likewise, the statement “x –” means to decrement the value of x by 1. Another way of writing increment statements is to use the conventional + plus sign or – minus sign. In the case of “x++”, another way to write it is “x = x +1”.

Q13: What is the difference between Call by Value and Call by Reference?
A13: When using Call by Value, you are sending the value of a variable as parameter to a function, whereas Call by Reference sends the address of the variable. Also, under Call by Value, the value in the parameter is not affected by whatever operation that takes place, while in the case of Call by Reference, values can be affected by the process within the function.

Q14: Some coders debug their programs by placing comment symbols on some codes instead of deleting it. How does this aid in debugging?
A14: Placing comment symbols /* */ around a code, also referred to as “commenting out”, is a way of isolating some codes that you think maybe causing errors in the program, without deleting the code. The idea is that if the code is in fact correct, you simply remove the comment symbols and continue on. It also saves you time and effort on having to retype the codes if you have deleted it in the first place.

Q15: What is spaghetti programming?
A15: paghetti programming refers to codes that tend to get tangled and overlapped throughout the program. This unstructured approach to coding is usually attributed to lack of experience on the part of the programmer. Spaghetti programing makes a program complex and analyzing the codes difficult, and so must be avoided as much as possible.

Q16: Differentiate Source Codes from Object Codes
A16: Source codes are codes that were written by the programmer. It is made up of the commands and other English-like keywords that are supposed to instruct the computer what to do. However, computers would not be able to understand source codes. Therefore, source codes are compiled using a compiler. The resulting outputs are object codes, which are in a format that can be understood by the computer processor. In C programming, source codes are saved with the file extension .C, while object codes are saved with the file extension .OBJ

Q17: What is the modulus operator?
A17: The modulus operator outputs the remainder of a division. It makes use of the percentage (%) symbol. For example: 10 % 3 = 1, meaning when you divide 10 by 3, the remainder is 1.

Q18: What is a nested loop?
A18: A nested loop is a loop that runs within another loop. Put it in another sense, you have an inner loop that is inside an outer loop. In this scenario, the inner loop is performed a number of times as specified by the outer loop. For each turn on the outer loop, the inner loop is first performed.

Q19: Which control loop is recommended if you have to execute set of statements for fixed number of times?
A19: for – Loop.

Q20: Can one function call another?
A20: Yes, any user defined function can call any function.

Q21: Apart from Dennis Ritchie who the other person who contributed in design of C language.
A21: Brain Kernighan

Q22: Is there a way to compare two structure variables?
A22: There is no such. We need to compare element by element of the structure variables.

Q23: Which built-in library function can be used to match a patter from the string?
A23: Strstr()

Q24: What is the maximum length of an identifier?
A24: Ideally it is 32 characters and also implementation dependent.

Q25: When the macros gets expanded?
A25: At the time of preprocessing.

Q26: What is difference between far and near pointers?
A26: In first place they are non-standard keywords. A near pointer can access only 2^15 memory space and far pointer can access 2^32 memory space. Both the keywords are implementation specific and are non-standard.

Q27: What is the explanation for modular programming?
A27: The process of dividing the main program into executable subsection is called module programming. This concept promotes the reusability.

Q28: What is indirection?
A28: If you have defined a pointer to a variable or any memory object, there is no direct reference to the value of the variable. This is called indirect reference. But when we declare a variable it has a direct reference to the value.

Q29: Is there any possibility to create customized header file with C programming language?
A29: It is possible and easy to create a new header file. Create a file with function prototypes that needs to use inside the program. Include the file in ‘#include’ section from its name.

Q30: What are the modifiers available in C programming language?
A30: There are 5 modifiers available in C programming language as follows.

  • Short
  • Long
  • Signed
  • Unsigned
  • long long

Q31: Is it possible to use curly brackets ({}) to enclose single line code in C program?
A31: Yes, it is working without any error. Some programmers like to use this to organize the code. But the main purpose of curly brackets is to group several lines of codes.

Q32: What is the behavioral difference when include header file in double quotes (“”) and angular braces (<>)?
A32: When Header file include within double quotes (“”), compiler search first in the working directory for the particular header file. If not found then in the built in the include path. But when Header file include within angular braces (<>), the compiler only search in the working directory for the particular header file.

C Conclusion Interview FAQs

We know the list of C Interview Questions and Answers, C Interview Questions and Answers Freshers, C Interview Questions and Answers, C Interview Questions is overwhelming but the advantages of reading all the questions will maximize your potential and help you crack the interview. The surprising fact is that this C interview questions and answers post covers all the basic of the C technology and you have to check out the FAQs of different components of C too.

However, you will be asked with the questions in the interview related to the above mentioned questions. Preparing and understanding all the concept of C technology will help you strengthen the other little information around the topic.

After preparing these interview questions, we recommend you to go for a mock interview before facing the real one. You can take the help of your friend or a C expert to find the loop holes in your skills and knowledge. Moreover, this will also allow you in practicing and improving the communication skill which plays a vital role in getting placed and grabbing high salaries.

Remember, in the interview, the company or the business or you can say the examiner often checks your basic knowledge of the subject. If your basics is covered and strengthened, you can have the job of your dream. The industry experts understand that if the foundation of the student is already made up, it is easy for the company to educate the employ towards advance skills. If there are no basics, there is no meaning of having learnt the subject.

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We hope that you enjoyed reading C Interview Questions and Answers, C Interview Questions and Answers Freshers, C Interview Questions and Answers, C Interview Questions and all the FAQs associated with the interview. Do not forget to revise all the C interview questions and answers before going for the C interview. In addition to this, if you’ve any doubt or query associated with C, you can contact us anytime. We will be happy to help you out at our earliest convenience. At last, we wish you all the best for your upcoming interview on C Technology.