// CPP code to illustrate Queue in
// Standard Template Library (STL)
#include <iostream>
#include <queue>
using namespace std;
// Print the queue
void showq(queue<int> gq)
{
queue<int> g = gq;
while (!g.empty()) {
cout << '\t' << g.front();
g.pop();
}
cout << '\n';
}
// Driver Code
int main()
{
queue<int> gquiz;
gquiz.push(10);
gquiz.push(20);
gquiz.push(30);
cout << "The queue gquiz is : ";
showq(gquiz);
cout << "\ngquiz.size() : " << gquiz.size();
cout << "\ngquiz.front() : " << gquiz.front();
cout << "\ngquiz.back() : " << gquiz.back();
cout << "\ngquiz.pop() : ";
gquiz.pop();
showq(gquiz);
return 0;
}