what is the basic difference between stack and queue

Question

What is the basic difference between stack and queue    Please help me i am unable to find the difference   How do you differentiate a stack and a queue   I searched for the answer in various links and found this answer    In high level programming   a stack is defined as a list or sequence of elements that is lengthened by placing new elements  on top  of existing elements and shortened by removing elements from the top of existing elements  It is an ADT Abstract Data Type  with math operations of  push  and  pop    A queue is a sequence of elements that is added to by placing the new element at the rear of existing and shortened by removing elements in front of queue  It is an ADT Abstract Data Type   There is more to these terms understood in programming of Java  C    Python and so on   Can i have an answer which is more detailed  Please help me

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Stack is a LIFO  last in first out  data structure  The associated link to wikipedia contains detailed description and examples   Queue is a FIFO  first in first out  data structure  The associated link to wikipedia contains detailed description and examples

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Queue  Queue is a ordered collection of items   Items are deleted at one end called    front    end of the queue   Items are inserted at other end called    rear    of the queue   The first item inserted is the first to be removed  FIFO    Stack  Stack is a collection of items   It allows access to only one data item  the last item inserted   Items are inserted  amp  deleted at one end called    Top of the stack      It is a dynamic  amp  constantly changing object   All the data items are put on top of the stack and taken off the top  This structure of accessing is known as Last in First out structure  LIFO

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A Visual Model Pancake Stack  LIFO  The only way to add one and or remove one is from the top   Line Queue  FIFO  When one arrives they arrive at the end of the queue and when one leaves they leave from the front of the queue   Fun fact  the British refer to lines of people as a Queue

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To try and over-simplify the description of a stack and a queue  They are both dynamic chains of information elements that can be accessed from one end of the chain and the only real difference between them is the fact that   when working with a stack   you insert elements at one end of the chain and  you retrieve and or remove elements from the same end of the chain   while with a queue   you insert elements at one end of the chain and you retrieve remove them from the other end   NOTE   I am using the abstract wording of retrieve remove in this context because there are instances when you just retrieve the element from the chain or in a sense just read it or access its value  but there also instances when you remove the element from the chain and finally there are instances when you do both actions with the same call   Also the word element is purposely used in order to abstract the imaginary chain as much as possible and decouple it from specific programming language  terms  This abstract information entity called element could be anything  from a pointer  a value  a string or characters  an object     depending on the language   In most cases  though it is actually either a value or a memory location  i e  a pointer   And the rest are just hiding this fact behind the language jargon lt   A queue can be helpful when the order of the elements is important and needs to be exactly the same as when the elements first came into your program  For instance when you process an audio stream or when you buffer network data  Or when you do any type of store and forward processing  In all of these cases you need the sequence of the elements to be output in the same order as they came into your program  otherwise the information may stop making sense  So  you could break your program in a part that reads data from some input  does some processing and writes them in a queue and a part that retrieves data from the queue processes them and stores them in another queue for further processing or transmitting the data   A stack can be helpful when you need to temporarily store an element that is going to be used in the immediate step s  of your program  For instance  programming languages usually use a stack structure to pass variables to functions  What they actually do is store  or push  the function arguments in the stack and then jump to the function where they remove and retrieve  or pop  the same number of elements from the stack  That way the size of the stack is dependent of the number of nested calls of functions  Additionally  after a function has been called and finished what it was doing  it leaves the stack in the exact same condition as before it has being called  That way any function can operate with the stack ignoring how other functions operate with it   Lastly  you should know that there are other terms used out-there for the same of similar concepts  For instance a stack could be called a heap  There are also hybrid versions of these concepts  for instance a double-ended queue can behave at the same time as a stack and as a queue  because it can be accessed by both ends simultaneously  Additionally  the fact that a data structure is provided to you as a stack or as a queue it does not necessarily mean that it is implemented as such  there are instances in  which a data structure can be implemented as anything and be provided as a specific data structure simply because it can be made to behave like such  In other words  if you provide a push and pop method to any data structure  they magically become stacks

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Stacks a considered a vertical collection  First understand that a collection is an OBJECT that gathers and organizes other smaller OBJECTS  These smaller OBJECTS are commonly referred to as Elements  These elements are  Pushed  on the stack in an A B C order where A is first and C is last  vertically it would look like this                                                    3rd element added  C                                                   2nd element added  B                                                   1st element added  A  Notice that the  A  which was first added to the stack is on the bottom   If you want to remove the  A  from the stack you first have to remove  C   then  B   and then finally your target element  A   The stack requires a LIFO approach while dealing with the complexities of a stack  Last In First Out  When removing an element from a stack  the correct syntax is pop  we don t remove an element off a stack we  pop  it off   Recall that  A  was the first element pushed on to the stack and  C  was the last item Pushed on the stack  Should you decide that you would like to see what is on bottom the stack  being the 3 elements are on the stack ordered A being the first B being the second and C being the third element  the top would have to be popped off then the second element added in order to view the bottom of the stack

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STACK is a LIFO  last in  first out  list  means suppose 3 elements are inserted in stack i e 10 20 30  10 is inserted first  amp  30 is inserted last so 30 is first deleted from stack  amp  10 is last deleted from stack this is an LIFO list Last In First Out    QUEUE is FIFO list First In First Out  means one element is inserted first which is to be deleted first e g queue of peoples

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A stack is a collection of elements  which can be stored and retrieved one at a time  Elements are retrieved in reverse order of their time of storage  i e  the latest element stored is the next element to be retrieved  A stack is sometimes referred to as a Last-In-First-Out  LIFO  or First-In-Last-Out  FILO  structure  Elements previously stored cannot be retrieved until the latest element  usually referred to as the  top  element  has been retrieved   A queue is a collection of elements  which can be stored and retrieved one at a time  Elements are retrieved in order of their time of storage  i e  the first element stored is the next element to be retrieved  A queue is sometimes referred to as a First-In-First-Out  FIFO  or Last-In-Last-Out  LILO  structure  Elements subsequently stored cannot be retrieved until the first element  usually referred to as the  front  element  has been retrieved

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STACK    Stack is defined as a list of element in which we can insert or delete elements only at the top of the stack  The behaviour of a stack is like a Last-In First-Out LIFO  system  Stack is used to pass parameters between function  On a call to a function  the parameters and local variables are stored on a stack  High-level programming languages such as Pascal  c  etc  that provide support for recursion use the stack for bookkeeping  Remember in each recursive call  there is a need to save the current value of parameters  local variables  and the return address  the address to which the control has to return after the call     QUEUE    Queue is a collection of the same type of element  It is a linear list in which insertions can take place at one end of the list called rear of the list  and deletions can take place only at other end  called the front of the list  The behaviour of a queue is like a First-In-First-Out  FIFO  system

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Imagine a stack of paper   The last piece put into the stack is on the top  so it is the first one to come out   This is LIFO   Adding a piece of paper is called  pushing   and removing a piece of paper is called  popping      Imagine a queue at the store   The first person in line is the first person to get out of line   This is FIFO   A person getting into line is  enqueued   and a person getting out of line is  dequeued

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STACK  Stack is defined as a list of element in which we can insert or delete elements only at the top of the stack  Stack is used to pass parameters between function  On a call to a function  the parameters and local variables are stored on a stack   A stack is a collection of elements  which can be stored and retrieved one at a time  Elements are retrieved in reverse order of their time of storage  i e  the latest element stored is the next element to be retrieved  A stack is sometimes referred to as a Last-In-First-Out  LIFO  or First-In-Last-Out  FILO  structure  Elements previously stored cannot be retrieved until the latest element  usually referred to as the  top  element  has been retrieved   QUEUE   Queue is a collection of the same type of element  It is a linear list in which insertions can take place at one end of the list called rear of the list  and deletions can take place only at other end  called the front of the list  A queue is a collection of elements  which can be stored and retrieved one at a time  Elements are retrieved in order of their time of storage  i e  the first element stored is the next element to be retrieved  A queue is sometimes referred to as a First-In-First-Out  FIFO  or Last-In-Last-Out  LILO  structure  Elements subsequently stored cannot be retrieved until the first element  usually referred to as the  front  element  has been retrieved

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You can think of both as an ordered list of things  ordered by the time at which they were added to the list   The main difference between the two is how new elements enter the list and old elements leave the list   For a stack  if I have a list a  b  c  and I add d  it gets tacked on the end  so I end up with a b c d  If I want to pop an element of the list  I remove the last element I added  which is d  After a pop  my list is now a b c again  For a queue  I add new elements in the same way  a b c becomes a b c d after adding d  But  now when I pop  I have to take an element from the front of the list  so it becomes b c d    It s very simple

[stack] what is the basic difference between stack and queue?

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