Question

Differentiate between stack and queue data structure.

Hint:

Stack = LIFO (Last one in is the first one out). Queue = FIFO (First one in is the first one out).

Answer 1

The main difference between a stack and a queue is the order in which elements are accessed. \begin{tabular}{|p{0.45\linewidth}|p{0.45\linewidth}|} \hline Stack & Queue
\hline Principle: Follows LIFO (Last-In, First-Out). The last element added is the first one to be removed. & Principle: Follows FIFO (First-In, First-Out). The first element added is the first one to be removed.
\hline Analogy: A stack of plates. & Analogy: A queue of people waiting in line.
\hline Operations: `Push` (to insert) and `Pop` (to remove). & Operations: `Enqueue` (to insert) and `Dequeue` (to remove).
\hline Pointers: Only one pointer, called `top`, which points to the last inserted element. & Pointers: Two pointers, `front` (or `head`) and `rear` (or `tail`), to track the start and end of the queue.
\hline Applications: Function call management, expression evaluation, undo/redo features. & Applications: CPU scheduling, print job scheduling, data buffers.
\hline \end{tabular}