Serving requests on a single shared resourceĪlso Read: Difference Between Array And Linked List Data Structures. People calling them in an order, until a service representative is free. Call Center phone systems uses Queues to hold. Interrupts are handled in the same order as they arrived i.e first come first Handling of interrupts in real-time systems. 
To as Enqueue whereas the process of removing an element from the queue is The process of adding an element into the queue is referred For example, while waiting in line at your favorite food store, theįirst in line will be the first to leave, with new people being added to the This is exactly how queue system works in Generally, Queues are data structures based on the First Inįirst out (FIFO) principle i.e the element inserted at the first, is the firstĮlement to come out of the list. Just like Stack, Queue is an abstract data type or linearĭata structure in which the first element is inserted from one end referred toĪs REAR (also called tail) and the removal of the existing element takes placeįrom the other end referred to as FRONT (also called head).
Stack is used in infix to postfix conversion, scheduling algorithms, depth first search and evaluation of an expression. Task scheduling by operating system uses queue or a system interrupt is a good example where the queue mechanism is used. To check if a stack is full, the following condition is used: TOP=MAX-1. To check if a stack is empty, the following condition is used: TOP=-1. The most and least accessible elements are referred to as TOP and BOTTOM of the stack. A stack data structure is not necessarily an ordered collection of data items. A stack cannot be divided into sub sections and it does not have extensions. Push operation is adding operation in the stack whereas POP operation is removing an element in the stack. In stack operations are referred to as PUSH and POP. In stacks only one flag is maintained to access the list which always points to the last element present in the list. A stack requires only one reference pointer, referred to as top pointer which always points to the last element present in the list. The element can only be removed in the opposite order of insertion. Insertion and deletion in stacks takes place only from one end of the list referred the top. Stacks are based on Last In First Out (LIFO) principle i.e the element inserted at the last, is the first element to come out of the list. Expression Conversion (Infix to Postfix, Postfix. Get the top data element of the stack, without removing it. For the same purpose, the following functionality is added to To use a stack efficiently, we need to check the status of
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