C++ queue front() Function

C++ Queue front() function returns the value of the front element of the queue. The first element is the oldest element or the element which was initially added to the queue. The function is used to return that element.

Syntax

value_type& front();
const value_type& front() const;

Parameters

The function does not take any parameter, it is only used to return the value of the oldest element or the element at the front end of the queue.

Return value

The function returns the front element of the queue.

Example 1

#include <iostream>
#include <queue>
int main()
{
	std::queue<int> newqueue;
	newqueue.push(24);
	newqueue.push(80);
	newqueue.front () +=20;
	std::cout <<"newqueue.front() is modified to " << newqueue.front();
	return 0;
}

Output:

newqueue.front() is modified to 44

Example 2

#include <iostream>
#include <queue>
using namespace std;
int main()
{
	queue<int> newqueue;
	newqueue.push(11);
	newqueue.push(22);
	newqueue.push(33);
	cout << newqueue.front();
	return 0;
}

Output: