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In this article, we explore the implementation of stacks using queues and the interplay between push vs pop operations. Stacks, based on the Last-In-First-Out (LIFO) principle, and queues, based on the First-In-First-Out (FIFO) principle, have distinct characteristics. However, by manipulating queues intelligently, we can mimic stack behavior. We discuss different approaches, including making either the push vs pop operation costly as well as utilizing a queue as a stack. Join us as we delve into the push vs pop dynamics and unravel the art of implementing data structures.<\/p>\n
Stack is a linear data structure in which a user can insert and delete an element from the same end which is known as a top.
\nStack data structure follows LIFO property i.e. Last in first out.
\nIn LIFO, the element which was inserted last will be the element which was removed first.
\nIn stack, the process of insertion is called push operation and the process of deletion of the element from the stack is known as pop.
\nAnd, we can easily keep track of the last element using a pointer called top.<\/p>\n
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Queue is a linear data structure by nature. First in, First out, or FIFO, is the queue’s guiding principle. To put it another way, we may say that what goes in first is what comes out first.
\nThe insertion and deletion in the queue is done from both ends i.e. from front and rear end. Insertion in the queue is done from the rear end whereas the deletion in the queue is done from the front end.
\nConsider taking a ticket. In a line outside a theater, the individual who joins first receives the first ticket.<\/p>\n
Now, we had a brief idea about stack and queue, let\u2019s move to our main topic i.e. how to implement stack using queue?<\/p>\n
We can implement stack by using two queues. Let stack be the S and queues be q1 and q2.
\nWe can implement stack by two ways:<\/p>\n
The idea is to keep newly entered elements at the front of ‘q1’ so that pop operation dequeues from ‘q1’. ‘q2’ is used to put every new element in front of ‘q1’.<\/p>\n
Follow the below steps to implement the push(s, x) operation:<\/strong><\/p>\n Follow the below steps to implement the pop(s) operation:<\/strong><\/p>\n C program to implement stack using queue<\/strong>\n
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