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Chapter 18: Problem 2

What element is retrieved from a stack by the pop operation?

Short Answer

Expert verified
Answer: The element retrieved by the pop operation is the top element of the stack, which is the most recently added item. In a LIFO structure, the last item added is the first item to be removed.

Step by step solution

01

Definition of a Stack

A stack is a linear data structure that stores items with a Last-In-First-Out (LIFO) order, meaning that the most recently added item to the stack is the first to be removed. Two primary operations can be performed on a stack: push (adding an item to the stack) and pop (removing the top item from the stack).
02

Pop Operation

The pop operation is responsible for removing the top item from the stack. The item that was most recently added to the stack (the last item) is removed by this operation.
03

Element Retrieved by Pop Operation

The element retrieved by the pop operation is the top element of the stack, which is the most recently added item. In a LIFO structure, this should always be the case, as the last item added is the first item to be removed.

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Most popular questions from this chapter

The STL stack is considered a container adapter. What does that mean?

Suppose the following operations were performed on an empty stack: push (0) push (9) push (12) push (1) Insert numbers in the following diagram to show what will be stored in the static stack after the operations have executed.

What types may the STL stack be based on? By default, what type is an STL stack based on?

When an element is added to a queue, where is it added?

A common real-life example used to explain stacks is the stack of plates in a cafeteria. Find at least two other real-life examples in which items are added and removed from a container in last-in-first-out order, and use these examples to explain the concept of a stack.
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