#include <queue>
#include <iostream>
int main (){
using namespace std;
// A queue of integers
queue <int> qIntegers;
cout << "Inserting {10, 5, -1, 20} into the queue" << endl;
// elements pushed into the queue are inserted at the end
qIntegers.push (10);
qIntegers.push (5);
qIntegers.push (-1);
qIntegers.push (20);
// the elements in the queue now are {20, -1, 5, 10} in that order
cout << "The queue contains " << qIntegers.size ();
cout << " elements" << endl;
cout << "Element at the front: " << qIntegers.front() << endl;
cout << "Element at the back: " << qIntegers.back ();
cout << endl << endl;
cout << "Removing them one after another..." << endl;
while (qIntegers.size () != 0)
{
cout << "Deleting element " << qIntegers.front () << endl;
// Remove the element at the front of the queue
qIntegers.pop ();
}
cout << endl;
// Test if the queue is empty
if (qIntegers.empty ())
cout << "The queue is now empty!";
return 0;
}
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