# Week 9 Workshop 6 Linear Data Structures – Part 2 Applications

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Question

What is a stack?
A stack is a collection of objects where only the most recently inserted object can be removed at any time. A stack is a linear data structure. Last-In First-Out structure – LIFO.

what are the applications of a stack?
Matching brackets in arithmetic expressions, Recursive algorithms, Evaluating arithmetic expressions.

what are the 5 methods supported by Stack ADTs
Push, Pop, Peek, Empty, Full

What is push?
add an item to the stack

what is pop?
Remove an item from the top of the stack

what is peek
Peek Examine item at the top of the stack,

what is empty
Empty Determine if the stack is empty,

what is full?
Full Determine if the stack is full.

what 3 situations will cause a stack to throw an error when a method is enacted?
push operation is requested on a full stack, pop operation is requested on an empty stack.

what is a queue?
A queue is a collection of objects organised such that the object that has been stored in the queue the longest is the next one removed. A queue is a linear data structure.

what operations does a queue suppoort?
Enqueue, Dequeue, Full, Empty, First