IsEmpty → It is used to check whether the queue has any element or not. As stated earlier, any new item enters at the tail of the queue, so Enqueue adds an item to the tail of a queue.ĭequeue → It is similar to the pop operation of stack i.e., it returns and deletes the front element from the queue. But let’s first discuss the operations which are done on a queue.Įnqueue → Enqueue is an operation which adds an element to the queue. Similar to the stack, we will implement the queue using a linked list as well as with an array. Similar to a queue of day to day life, in Computer Science also, a new element enters a queue at the last (tail of the queue) and removal of an element occurs from the front (head of the queue). For example, a new person enters a queue at the last and the person who is at the front (who must have entered the queue at first) will be served first. It is equivalent to the queues in our general life. A queue follows FIFO (First-in, First out) policy. resize(): changes the size of the element’s container as per requirement.Similar to stacks, a queue is also an Abstract Data Type or ADT.insert(): increases the container side by inserting element in the specified position.clear() and erase(): clear is used to remove all the elements from the deque and erase is used to remove some specified elements.pop_front() and pop_back(): pop_front() function is used to pop elements from a deque from the front and pop_back( ) function is used to pop elements from a deque from the back.push_back() and push_front(): push_front( ) push the elements into a deque from the front and push_back( ) push elements into a deque from the back.max_size(): Returns the maximum number of elements deque can contain.Map in C++ Standard Template Library (STL).Initialize a vector in C++ (7 different ways).Sort in C++ Standard Template Library (STL).The C++ Standard Template Library (STL).Vector of Vectors in C++ STL with Examples.2D Vector In C++ With User Defined Size.How to pass a 2D array as a parameter in C?.How to dynamically allocate a 2D array in C?.Dynamic Memory Allocation in C using malloc(), calloc(), free() and realloc().Difference Between malloc() and calloc() with Examples.How to deallocate memory without using free() in C?.Initialization of static variables in C.Understanding “volatile” qualifier in C | Set 2 (Examples).What are the default values of static variables in C?.deque::clear() and deque::erase() in C++ STL.Deque::front() and deque::back() in C++ STL.Deque in C++ Standard Template Library (STL). Difference between Queue and Deque in C++.ISRO CS Syllabus for Scientist/Engineer Exam.ISRO CS Original Papers and Official Keys.GATE CS Original Papers and Official Keys.DevOps Engineering - Planning to Production.Python Backend Development with Django(Live).Android App Development with Kotlin(Live).Full Stack Development with React & Node JS(Live).Java Programming - Beginner to Advanced.Data Structure & Algorithm-Self Paced(C++/JAVA).Data Structures & Algorithms in JavaScript.Data Structure & Algorithm Classes (Live).
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