C Interview Questions

The site is flooded with tons of Frequently asked C Interview Questions so what I am doing is making a small list of Most Important C Questions. The questions are already there in the site so I will just be providing links to those C Questions.
Here are Few of C Interview Questions - For more Please check Basic C Programming and Advanced C Programming You can also read more C Interview Questions at C Interview Questions. The above link covers Basic Interview Questions of C Programming from data types to I/O, disk reading etc.
The rest of the questions can be read below.

• What are macros ?


• What is the difference between char *a and char a[]?


• What is a NULL pointer? How is it different from an unitialized pointer? How is a NULL pointer defined?


• What is a memory leak?


• What is the difference between malloc() and calloc()?


• How do you reverse a singly linked list? How do you reverse a doubly linked list? Write a C program to do the same


• Given only a pointer to a node to be deleted in a singly linked list, how do you delete it?


• How do you sort a linked list? Write a C program to sort a linked list.


• How do you reverse a linked list without using any C pointers?


• How would you detect a loop in a linked list? Write a C program to detect a loop in a linked list


• Write a C program to find the depth or height of a tree


• Write a C program to determine the number of elements (or size) in a tree.


• Write a C program to delete a tree (i.e, free up its nodes)


• Write C code to determine if two trees are identical


• Write a C program to find the mininum value in a binary search tree.


• Write a C program to compute the maximum depth in a tree?