/*
#include <stdio.h>



void foo(int n);

/////////////////////////////////////////////////////
int main()
{

    int n = 100;

    foo(n);

    printf("n from matn = %d\n", n);
}


//////////////////////////////////////////////////////
void foo(int n)
{

     n = n - 77;
}




*/














/*
#include <iostream>
#include    <queue>

using namespace std;


//////////////////////////////////////////////////////////////////////
int main()
{


  queue<string> animals;                             // create a queue of string


  animals.push("Cat");                           // push elements into the queue
  animals.push("Dog");

  cout << "Queue: ";





  while(animals.empty() != 1)   // print elements of queue loop until queue is empty
  {

    cout << animals.front() << ", ";                         // print the element

    animals.pop();                                 // pop element from the queue

  }

  cout << endl;

  return 0;
}
*/







#include <iostream>
#include    <queue>
using namespace std;


void display_queue(queue<string> q);               // function prototype for display_queue utility
/////////////////////////////////////////////////////
int main() {


  queue<string> animals;                           // create a queue of string


  animals.push("Cat");                             // push element into the queue
  animals.push("Dog");
  animals.push("Fox");

  cout << "Initial Queue: ";
  display_queue(animals);


  animals.pop();                                   // remove element from queue

  cout << "Final Queue: ";
  display_queue(animals);

  return 0;
}



///////////////////////////////////////////////// utility function to display queue
void display_queue(queue<string> q)
{

   while(q.empty() != 1)
   {
      cout << q.front() << ", ";
      q.pop();
   }

  cout << endl;
}