#include<queue>
using namespace std;
 
int main(void)
{
queue<char> Queue;
 
Queue.push('A');
Queue.push('B');
Queue.push('C');
 
cout << "Queue Size : " << Queue.size() << endl;
 
cout << "Queue Items" << endl;
 
while( ! Queue.empty() )
{
cout << Queue.front() << endl;
Queue.pop(); 
}
 
return 0;
}

#include<iostream>
#include<queue>
using namespace std;
int main(){
 
    queue<int> Q;
 
    cout << "size of queue: " << Q.size() << endl;
    cout << "Is queue empty?: " << Q.empty() << endl<<endl;
 
    Q.push(1);
    Q.push(2);
    Q.push(3);
 
    cout << "size of queue: " << Q.size() << endl;
    cout << "Is queue empty?: " << Q.empty() << endl << endl;
 
    cout << "Front of queue: " << Q.front() << endl;
    cout << "Back of queue: " << Q.back() << endl;
    cout << "size of queue: " << Q.size() << endl << endl;
 
    Q.pop();
 
    cout << "size of queue after popped: " << Q.size() << endl;
    cout << "Front of queue: " << Q.front() << endl;
 
 
    return 0;
}