In C++ STL, we have a queue container that simulates the queue data structure and follows the FIFO (First In, First Out) rule. In this article, we will learn how to enqueue (insert) an element into a queue in C++.

Example:

Input: 
myQueue = {10, 20, 30};
elementToEnqueue= 40

Output: 
Queue after enqueue: 10 20 30 40

Add an Element to a Queue in C++

To enqueue an element into a std::queue in C++ STL, we can use the std::queue::push() function that inserts a new element at the end of the queue, after its current last element.

C++ Program to Enqueue an Element into a Queue

The below example demonstrates how we can enqueue an element into a queue in C++.

Elements in a Queue are:
10 20 30 40 

Time Complexity: O(1)
Auxiliary Space: O(1)