Top C Programming Interview Questions and Answers (2024)
Prepare for your next C programming interview with our curated collection of top C Programming interview questions and answers (2024).
1. Why C programming language is called a mid-level programming language?
C programming supports both low-level and high-level programming languages so it is called a mid-level programming language.
2. Which are the various features of C programming language?
Following are some of the features of the C programming language:
- Easy to extend
- Portability
- Procedural language
- Mid-level language
- Fast and efficient
- Libraries with rich functions
- Rich set of built-in operators
- General purpose language
3. What is the scope of the variable?
The scope of a variable in any programming language is an area or block of code where the defined variable will exist outside that block that variable is destroyed. The scope of a variable can be either local or global. Inside the code block, the scope of a variable is local and if the variable is declared before main then it’s scope is global.
4. What is the difference between malloc() and calloc()?
malloc() method allocates memory to a variable but does not initialize it, and calloc() method allocates memory to a variable and initializes all bits to zero.
5. Explain the difference between char *ptr and char ptr[].
char *ptr declares a pointer to a character, while char ptr[] declares an array of characters. The former can be reassigned to point to different memory locations, while the latter is a fixed-size array.
6. What is the purpose of typedef in C?
typedef is used to create aliases for data types. It’s often used to improve code readability and make it easier to modify data types.
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7. What is the difference between ++i and i++?
++i is pre-increment, which means the value of i is incremented before it’s used in the expression, while i++ is post-increment, which means the value of i is used in the expression and then incremented.
8. Explain the difference between memset() and memcpy().
memset() is used to fill a block of memory with a particular value, while memcpy() is used to copy a block of memory from one location to another.
9. What is a static variable?
A static variable in C retains its value between function calls. It’s initialized only once and persists until the program terminates.
10. What is a pointer?
A pointer is a variable that stores the memory address of another variable. Pointers are used to manipulate memory directly and to create dynamic data structures.
11. What is the volatile keyword used for?
The volatile keyword tells the compiler that a variable’s value may change at any time without any action being taken by the code nearby. This prevents the compiler from optimizing away certain operations that involve that variable.
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12. What is the difference between union and struct?
In a struct, each member has its own memory location, and the size of the struct is the sum of the sizes of its members. In a union, all members share the same memory location, and the size of the union is the size of its largest member.
13. What is the purpose of the const keyword?
The const keyword is used to declare constants in C. It tells the compiler that the value of a variable cannot be changed once it has been initialized.
These questions cover a range of topics commonly encountered in C programming interviews. Make sure to understand these concepts thoroughly and be prepared to explain them in detail.
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Sarika Ganesh Kore
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