TCS NQT Guide TCS NQT Programming Logic & CS FundamentalsData Structures: Stack and Queue Implementations & Applications

Data Structures: Stack and Queue Implementations & Applications

Learn core concepts, essential formulas, and attempt practice questions designed on the latest TCS NQT testing patterns.

Key Concepts & Formulas

1Stack: LIFO (Last In First Out). Operations: Push, Pop.
2Queue: FIFO (First In First Out). Operations: Enqueue, Dequeue.
3Stack applications: Function calls call stack, parentheses matching, undo systems.

Practice Question 1

Which data structure is used to evaluate postfix expressions?

A) Stack

B) Queue

C) Linked List

D) Tree

Correct Answer: A) Stack

Step-by-step Solution: Stacks are used in postfix evaluation to store operands until operators are encountered.

Practice Question 2

If elements are inserted in order A, B, C into a Queue, what is order of removal?

A) A, B, C

B) C, B, A

C) B, C, A

D) A, C, B

Correct Answer: A) A, B, C

Step-by-step Solution: Queues are First In First Out. The first element inserted (A) is the first removed.

Practice array-based implementations of circular queues to clear stack/queue basics.