I attended a virtual career fair and received a follow-up requesting me to schedule an initial HR interview. This interview consisted of all the same HR questions that are mentioned here. Following that, I was scheduled for a technical interview three weeks later.

I would suggest going through each and every question here; do not skip any. I know it's difficult because there are so many, but do your best to cover the maximum.

Given below are the questions I remember being asked:

• calloc and malloc
• == and .equals
• Constructors
• JVM and Java
• Abstract classes and interfaces
• Garbage collection in Java
• Binary and unary operators
• Default methods in a C++ class
• Connected graphs
• What is NFA and DFA?
• Can all NFAs be converted to DFAs?
• #include " " and #include < > differences
• Explain each keyword in public static void main()
• A (int (B union C))
• A 4-faced die and a 6-faced die: What is the probability that when rolled, the same number appears on both?
• Implement a queue using a stack
• AP nth term
• Largest number an integer can represent
• Some code snippets asking me to explain their functionality
• Inline functions and macros
• In a class of 40 people, 24 took mathematics and 12 took both mathematics and English. If everyone in the class takes at least one course, how many people take English alone?
• Generics in Java
• Questions regarding complexity calculations
• What does stdio.h contain?

I was also given many code snippets in C, C++, and Java and asked to explain their output.

With this interview preparation, I brushed up on the basics of various languages. This was a valuable takeaway.

Explain how you implement a queue using stacks.