C++ Queue size() Function

C++ Queue size() function returns the number of queue elements. The number of elements in the queue is an actual representation of the size, and the size value is given by this function.

Syntax

Parameters

The function does not take any parameter, and it just returns the queue size.

Return value

The number of elements in the queue is returned. In other words, the size of the queue is given.

Example 1

#include <iostream>
#include <queue>
int main()
{
	std::queue<int> newqueue;
	std::cout<< "0. size: "<< newqueue.size();
	for(int j=0; j<5; j++)
	newqueue.push(j);
	std::cout<<"\n";
	std::cout << "1. size: " << newqueue.size();
	newqueue.pop();
	std::cout<<"\n";
	std::cout << "2. size: "<< newqueue.size();
	return 0;
}

Output:

0.size: 0
1.size: 5
2.size: 4

Example 2

#include <iostream>
#include <queue>
using namespace std;
int main()
{
	int result = 0;
	queue<int> newqueue;
	newqueue.push(12);
	newqueue.push(24);
	newqueue.push(36);
	newqueue.push(48);
	cout<<"Size of the queue is ";
	cout<<newqueue.size();
	return 0;
}

Output: