Definition

Noun: A push-down stack is a specific type of data structure in computer science. It follows a "Last-In, First-Out" (LIFO) principle, meaning the most recently added item is the first one to be removed. Items are "pushed" onto the top of the stack and "popped" off from the top.

Usage

The term is used primarily in computing and programming contexts to describe a method for storing and retrieving data. * The function uses a push-down stack to manage its recursive calls. * Understanding how a push-down stack works is fundamental to parsing expressions.

Advanced Usage

• Call Stack: A critical application of the push-down stack concept is the call stack, which tracks active subroutines (functions or methods) in a program.
  • When the function calls itself, a new frame is added to the call stack.
• Stack Pointer: In low-level programming, a register called the stack pointer keeps track of the top of the push-down stack in memory.

Variants and Related Words

• Stack (n): The common, shortened term for "push-down stack."
  • The algorithm uses a stack to reverse the order of the characters.
• LIFO (Acronym): Stands for "Last-In, First-Out," describing the stack's operational principle.
• Push (v): The action of adding an item to the top of the stack.
• Pop (v): The action of removing the top item from the stack.

Synonyms

• LIFO list: A descriptive synonym emphasizing the order of operations.
• Last-in, first-out list: A full-phrase synonym.

Related Phrases

• Stack overflow: An error condition that occurs when a push-down stack exceeds its allocated storage space.
  • The recursive function caused a stack overflow.
• Stack underflow: An error condition that occurs when an attempt is made to pop an item from an empty stack.
• Push onto the stack: To add data.
  • The program pushes the return address onto the stack.
• Pop from the stack: To remove data.
  • It then pops the value from the stack to use in the calculation.

Noun

1. a list in which the next item to be removed is the item most recently stored (LIFO)