C Arrays & Pointers: 22 MCQs with answers

Q1. What is a 1D array in C? How is it declared and initialized?

Q2. How do you access elements of a 2D array in C? Provide the syntax.

Q3. What is the purpose of the `goto` statement in C? Give a simple example.

Q4. How do you declare a pointer in C? How do you initialize and dereference it?

Q5. What is a Variable Length Array (VLA) in C? Give an example.

Q6. What is the NULL statement in C? When is it used?

Q7. Explain the comma operator in C with an example.

Q8. What is a NULL pointer? What happens if you dereference it?

Q9. What is a void pointer? How is it used?

Q10. What is a wild pointer? How can it be avoided?

Q11. What is a dangling pointer? Give an example of how it occurs.

Q12. What is a double pointer (pointer to pointer)? How is it declared?

Q13. What is a pointer to a function? How is it different from a function pointer?

Q14. Explain the concept of 1D and multi-dimensional arrays in C. How are they stored in memory? Write a C program to add two 2x2 matrices using 2D arrays.

Q15. Discuss the different special types of pointers in C: NULL pointer, void pointer, wild pointer, and dangling pointer. Explain with examples how each is created and how to avoid issues.

Q16. What is a Flexible Array Member in a structure? How is it declared?

Q17. What are `setjmp` and `longjmp` functions used for in C?

Q18. What is a function pointer? How do you declare and use it?

Q19. What are multilevel pointers? Provide an example.

Q20. Explain the concept of double pointers and multilevel pointers in C. Write a program that uses a double pointer to modify the value of an integer variable.

Q21. What are function pointers and pointers to functions? How are they declared, initialized, and used? Provide a program that uses a function pointer to call different arithmetic operations.

Q22. Describe the advanced control flow mechanisms in C: `goto`, NULL statement, comma operator, and `setjmp`/`longjmp`. Explain their use cases and provide a small example for each.