#include <iostream>
#include <iomanip>
#include <cmath>
#include <fstream>
#include <cstdlib>
using namespace std;

class Elevator
{
    public:
    Elevator();
    Elevator( int );

    public:
    void request( int );
    int getCurrentFloor();

    private:
    void goDown( int );
    void goUp( int );

    public:
    static const int BOTTOM_FLOOR;
    static const int TOP_FLOOR;
    int CurrentFloor, lowerFloor, higherFloor, newFloor;
};

const int Elevator::BOTTOM_FLOOR = 1;
const int Elevator::TOP_FLOOR = 15;

Elevator::Elevator()
{
    CurrentFloor = BOTTOM_FLOOR;
}

Elevator::Elevator( int CurrentFloor )
{
    if( CurrentFloor > TOP_FLOOR || CurrentFloor < BOTTOM_FLOOR )
    {
        CurrentFloor = BOTTOM_FLOOR;
    }
    else
        CurrentFloor = CurrentFloor;
}


int main()
{
    Elevator ele1;
    Elevator ele2;

    Elevator object1;
    object1.Elevator( 6 );


}

void Elevator::request( int newFloor )
{
    if( newFloor > TOP_FLOOR || newFloor < BOTTOM_FLOOR)
    {
        cout<< "Error: Invalid floor selection. ";
    }
    else if( newFloor > CurrentFloor)
    {
        goUp(higherFloor);
    }
    else if(newFloor < CurrentFloor)
    {
        goDown(lowerFloor);
    }
}

int Elevator::getCurrentFloor()
{
    return CurrentFloor;
}

void Elevator::goDown( int lowerFloor )
{
    cout<< "Starting at floor #  " << CurrentFloor;
    while( CurrentFloor > newFloor )
    {
        CurrentFloor--;
        cout<< "Going up -- now at floor #  " << CurrentFloor;
    }
    if( CurrentFloor == newFloor )
    {
        cout<< "Welcome to floor #  ";
    }
}

void Elevator::goUp( int higherFloor )
{
    cout<< "Starting at floor #  " << CurrentFloor;
    while( CurrentFloor < newFloor )
    {
        CurrentFloor++;
        cout<< "Going up -- now at floor #  " << CurrentFloor;
    }
    if( CurrentFloor == newFloor )
    {
        cout<< "Welcome to floor #  ";
    }
}