C programming interview questions For Freshers & Experienced

  • Sharad Jaiswal
  • 07th Aug, 2019

Despite the oldest language, C never be replaced by any modern language, as it is the core of every machine. One can say that it is the base for any programing language. It is a simple and flexible machine-independent language which is used in various applications. C language was first invented to design the operating system UNIX, but due to its popularity, it is widely used as a system programming language.

If you are a beginner in programming, then C will be a good choice to start with. If you are still confused, then check our online interview questions related to C and clear your doubts.

C programming interview questions
Updated ON

07th Aug, 2019

No. of Questions


Posted In

C language


Sharad Jaiswal

C Programming Interview Questions

Which is better?

C C++
C was designed by Dennis Ritchie between 1969 and 1973 at AT&T Bell Labs. C++ was designed by Bjarne Stroustrup in 1979.
C follows the procedural style programming. It supports both procedural and object-oriented, therefore it is known as multi-paradigm language.
C does not support object-oriented programming; therefore, it doesn’t support polymorphism, encapsulation, and inheritance features. Being an object-oriented programming language C++ supports data abstraction, polymorphism, encapsulation, and inheritance features.
Data is less secured in C. While in C++, you can use modifiers to make the data unreachable for outside users.
C, being procedural programming, it is a function-driven language. While, C++, being object-oriented programming, it is an object driven language.
Exception handling is not directly supported in C. It has to perform using other functions. C++ supports exception handling. Use Try and Catch blocks to correct hard errors.

Advantages of C:

  • Building Block: The programming language C is the most proficient language, the programs written in the C language act as a building block for other programming languages. Also, the essential principles of C language are used in other languages. Many programming languages such as Python, Java, C++, etc. Are designed on the base of C.+
  • Structured Language: The C language is a procedural-oriented language which means complex problems are divided into structures or blocks. It consists of functions modules or blocks that completes a program. This structure helps to debug and test the program easily. Along with that, C language also supports built-in functions written in the C library to develop the program.
  • Portable Language: Being a very flexible language, it never creates a problem to run on any machines. That is, it is machine independent language and the C program can run on any machine with few changes or even no changes.
  • Use of Algorithms and Data Structures: The implementation of data structures and algorithms make the computation fast and easy. With data structures, you can create your own user-defined data types to solve a specific problem. And, Algorithms let to solve your program in less complexity and run time. Moreover, C language can be used in complex problems and operations like in MATLAB.
  • Middle-Level Language: C language id middle level language that means it favors low-level programming as well as high-level Programming. For low-level programming, it supports the use of kernels and drivers, and for high-level programming, it supports system software applications.
  • Easy to learn: C language is a very efficient language as it has many data types and operators to perform all kind of operations. Therefore, a beginner can easily learn it and use it in his/her project very easily. The syntax is similar to the English language which is easy to remember and use. Thus, C language is used as a basis to learn other complex languages.
  • System Programming: C programming language is designed for a system-based approach. This means, programming is done for system hardware specifications and that let us know how high-level language interacts with the machine.

Disadvantages of C:

  • OOPs concept: C is a robust language but it doesn't support concepts of OOPs such as inheritance, polymorphism, encapsulation, data hiding, and abstraction. It just supports a procedural programming approach means every algorithm is a set of function calls.
  • Run type and strict type checking: since, C language does error checking mostly at compile time, so the errors are not detected after each line. The compiler doesn't allow run time checking, means all errors after writing the whole programs that create difficulty in large programs. Along with this, there is no strict type checking means when parameters are passed, no confirmation is processed
  • Exception Handling not supported: It is obvious that bugs and anomalies occur while compiling the programs. Exception Handling is the feature that allows to catch the errors and take suitable responses. But C doesn’t support this important feature.
  • Namespace concept: A namespace is a structured or chain of commands that allow you to reuse the same names in different contexts. It is supported by C++ but not implemented by C. Thus, in C we can't use the same names in declaring variables.

About Author :

  • Author of C programming interview questions

    Sharad Jaiswal

    Sharad Jaiswal is Sr. Web Developer from Noida area. He have rich experience in PHP, Angular Js, React, javascript and Node .If you any query or project on these programming you can drop your enquiry in comment section.

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