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queue::push() and queue::pop() in C++ STL
In this article we will be discussing the working, syntax and examples of queue::push() and queue::pop() functions in C++ STL.
What is a queue in C++ STL?
Queue is a simple sequence or data structure defined in the C++ STL which does insertion and deletion of the data in FIFO(First In First Out) fashion. The data in a queue is stored in continuous manner. The elements are inserted at the end and removed from the starting of the queue. In C++ STL there is already a predefined template of queue, which inserts and removes the data in the similar fashion of a queue.
What is queue::push()?
queue::push() is an inbuilt function in C++ STL which is declared in
This function further calls push_back() which helps in easy insertion of the element at the back of the queue.
Syntax
myqueue.push(type_t& value);
This function accepts one parameter the value which is of type_t that is the type of elements in the queue container.
Return value
This function returns nothing.
Example
Input: queue<int> myqueue = {10, 20 30, 40};
myqueue.push(23);
Output:
Elements in the queue are= 10 20 30 40 23Example
#include <iostream>
#include <queue>
using namespace std;
int main(){
queue<int> Queue;
for(int i=0 ;i<=5 ;i++){
Queue.push(i);
}
cout<<"Elements in queue are : ";
while (!Queue.empty()){
cout << ' ' << Queue.front();
Queue.pop();
}
}Output
If we run the above code it will generate the following output −
Elements in queue are : 0 1 2 3 4 5
What is queue::pop()?
queue::pop() is an inbuilt function in C++ STL which is declared in
Syntax
myqueue.pop();
This function accepts no parameters
Return value
This function returns nothing.
Example
Input: queue myqueue = {10, 20, 30, 40};
myqueue.pop();
Output:
Elements in the queue are= 20 30 40Example
#include <iostream>
#include <queue>
using namespace std;
int main(){
queue<int> Queue;
for(int i=0 ;i<=5 ;i++){
Queue.push(i);
}
for(int i=0 ;i<5 ;i++){
Queue.pop();
}
cout<<"Element left in queue is : ";
while (!Queue.empty()){
cout << ' ' << Queue.front();
Queue.pop();
}
}Output
If we run the above code it will generate the following output −
Element left in queue is : 5
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