Stack and Its Operations
“A stack is an ordered list in which all insertions and deletions are made at one end, called the top.”
Stacks are sometimes referred to as Last In First Out (LIFO) lists.
Example: Real life: Plates stacked over one another. The plate, which is at the top has to be removed first
and the plate, which is the bottom, remains in the stack for the longest period of time.
OPERATION ON STACK
Stacks have some useful terminology associated with them:
- Push To add an element to the stack.
- Pop To remove an element from the stack.
- Peek To look at elements in the stack without removing them.
- LIFO Refers to the last-in, first-out behavior of the stack.
- FILO Equivalent to LIFO (first in, last out).
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