C programming language is a powerful and widely used programming language that is popular among developers for its efficiency, reliability, and versatility. It is a high-level, procedural programming language that was developed in the 1970s by Dennis Ritchie at Bell Labs.
C language is used to create various system-level applications such as operating systems, device drivers, network applications, and embedded systems. It is also widely used in game development, scientific computing, and web development.
If you’re preparing for a C programming interview, it’s essential to have a strong understanding of the language and its features. In this blog post, we’ll provide you with a comprehensive list of commonly asked C programming interview questions and answers to help you ace your interview.
We’ll cover various topics including data types, control structures, functions, pointers, arrays, strings, and structures. We’ll also provide tips and tricks for tackling coding problems and explain the reasoning behind each answer.
Whether you’re a beginner or an experienced programmer, this blog post will help you prepare for your following C programming interview. So, let’s dive in and get started!
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I can provide you with a list of commonly asked interview questions with sample answers, but please note that it is important to tailor your answers to your specific skills and experiences. Also, keep in mind that interview questions can vary depending on the position, company, and industry.
C programming Common Interview Questions
1. What is C programming?
Answer:
C programming is a procedural language used to develop software applications, operating systems, and device drivers.
2. What is a pointer in C programming?
Answer:
A pointer is a variable that holds the memory address of another variable. It is used to access and manipulate data indirectly.
3. What is the difference between an array and a pointer?
Answer:
An array is a collection of data elements of the same type stored in contiguous memory locations, whereas a pointer is a variable that holds the memory address of another variable.
4. What is the difference between a structure and a union in C programming?
Answer:
A structure is a collection of variables of different data types stored in contiguous memory locations, whereas a union is a special data type that allows storing different data types in the same memory location.
5. What is the difference between a function declaration and a function definition?
Answer:
A function declaration tells the compiler about the function name, return type, and parameters, whereas a function definition contains the actual code of the function.
6. What is the significance of the ‘volatile’ keyword in C programming?
Answer:
The ‘volatile’ keyword is used to tell the compiler that the value of a variable may change unexpectedly, and that the variable should not be optimized.
7. What is recursion in C programming?
Answer: Recursion is a technique where a function calls itself to solve a problem.
8. What is the difference between ‘malloc’ and ‘calloc’ in C programming?
Answer:
‘malloc’ is used to allocate memory dynamically, whereas ‘calloc’ is used to allocate memory dynamically and initialize the memory to zero.
9. What is a static variable in C programming?
Answer:
A static variable is a variable that retains its value between function calls and is stored in the data segment of the memory.
10. What is a ‘const’ keyword in C programming?
Answer:
The ‘const’ keyword is used to declare a variable as read-only, which means its value cannot be modified.
11. What is a ‘struct’ keyword in C programming?
Answer:
The ‘struct’ keyword is used to define a user-defined data type that contains multiple variables of different data types.
Good practice to take notes
12. What is the difference between ‘++i’ and ‘i++’ in C programming?
Answer:
‘++i’ increments the value of the variable first and then uses it, whereas ‘i++’ uses the value of the variable first and then increments it.
13. What is a file pointer in C programming?
Answer:
A file pointer is a variable that holds the memory address of a file that is being accessed.
14. What is the ‘enum’ keyword in C programming?
Answer:
The ‘enum’ keyword is used to define a user-defined data type that consists of a set of named constants.
15. What is the difference between a local and global variable in C programming?
Answer:
A local variable is a variable defined within a function and has local scope, whereas a global variable is a variable defined outside any function and has global scope.
16. What is a preprocessor in C programming?
Answer:
A preprocessor is a program that processes the source code before compilation and performs tasks such as macro expansion and header file inclusion.
17. What is a function pointer in C programming?
Answer:
A function pointer is a variable that holds the memory address of a function.
18. What is the difference between a while loop and a do-while loop in C programming?
Answer:
A while loop checks the loop condition before executing the loop body, while a do-while loop executes the loop body at least once and then checks the condition. In other words, while loops may not execute the loop body at all, do-while loops always execute the loop body at least once.
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