Dennis Ritchie developed C programming language for writing operating systems efficiently and effectively. Big tech companies are highly interested to hire developers and programmers with sufficient knowledge in C programming language. Thus, thousands of aspiring employees of big tech companies should prepare themselves with multiple questions on C. Interview for C programmers can include questions at various levels — beginners, intermediate, and expert. Let's explore some of the top ten C programming interview questions for candidates to grab offer letters from big tech companies in 2022.
This is one of the top questions on C to ask candidates by big tech companies. The answer for this question is that most of the compilers, as well as JVMs, are written in this language. It continuously introduces new key concepts such as functions, arrays, and many more that can be used in other programming languages. C++, JavaScript, Python, etc. have taken inspiration from this C programming language only.
This question is a different one posed to know about candidates' knowledge about the features of the language. The features include being simple, portable, mid-level, structured, speed, memory management, as well as extensible for adopting new features.
Interviews for C programmers generally include questions on the usage of these two functions. Printf() is popular for printing the integer, float, character, and string values on the screen while the scanf() takes input from the user.
There is a number of differences between call by value and call by reference. They can include the basic description, memory location, argument, as well as safety with examples.
Knowledge of recursion is the basic thing an interview should have for this interview. The function that calls itself is known as a recursive function and the process is called recursion. Also, try to mention the two phases in recursions such as the winding phase and unwinding phase.
C programming interview questions may include pointers, functionalities of pointers, types of pointers, and their examples. A pointer is known as the variable referring to the address of a value.
There are different kinds of pointers available in the C language and it is one of the popular questions in the interviews for C programmers. Different types of pointersff include NULL, far pointer, dangling pointer, pointer-to-pointer.
There are different types of functions being used for dynamic memory allocation such as malloc(), calloc(), realloc(), free(), and many more. One needs to have a basic understanding of their differences to answer follow-up questions.
C programming language consists of a union known for a user-defined data type to allow storing multiple types of data in a single unit. One can access one variable at a time because of the allocation of one common space for all members of a union.
This is one of the well-known questions asked by big tech companies to understand the knowledge of candidates. Programmers can compile without a main() function but the programme cannot be executed unless one uses #define.
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