Hourglasss

#include<iostream>
using namespace std;

int main()
{
    int height, h, w;

    do
    {
        cout << "Enter hourglass height: ";
        cin >> height;

        if((height % 2 == 0 || !(height >= 0 && height <= 29)) && height != -1)
        {
            cout << "Invalid Input!" << endl;
        }

        else if(height == 1)
        {
            cout << "#" << endl;
        }

        else if(height != -1)
        {
            //first hourglass border
            for(w = 0; w < height; w++)
            {
                cout << "#";
            }
            cout << endl;

            //loop from first to the half of the height of the hourglass
            for(h = 0; h < height / 2 - 1; ++h)
            {
                //if first loop, then print, or if not, it is spaces
                for(w = 0; w < h+1; w++)
                {
                    if(w == 0)
                    {
                        cout << "#";
                    }
                    else
                    {
                        cout << " ";
                    }
                }

                //the asterisks between the spaces
                for(w = 0; w < height - (h+1) * 2; ++w)
                {
                    cout << "*";
                }

                //the last spaces to print, and the border(#)
                for(w = 0; w < h+1; w++)
                {
                    //if last loop, then print, or if not, it is spaces
                    if(w == h)
                    {
                        cout << "#";
                    }
                    else
                    {
                        cout << " ";
                    }
                }
                cout << endl;
            }

            //loop from half to the last of the height of the hourglass
            for(h = 0; h < height / 2; ++h)
            {
                //if first loop, then print, or if not, it is spaces
                for(w = 0; w < height / 2 - h; w++)
                {
                    if(w == 0)
                    {
                        cout << "#";
                    }
                    else
                    {
                        cout << " ";
                    }
                }

                //the asterisks between the spaces
                for(w = 0; w < h * 2 + 1; ++w)
                {
                    cout << "*";
                }

                //the last spaces to print, and the border(#)
                for(w = 0; w < height / 2 - h; w++)
                {
                    //if last loop, then print, or if not, it is spaces
                    if(w == height / 2 - h - 1)
                    {
                        cout << "#";
                    }
                    else
                    {
                        cout << " ";
                    }
                }
                cout << endl;
            }

            //last hourglass border
            for(w = 0; w < height; w++)
            {
                cout << "#";
            }
            cout << endl;
        }
    }
    while(height != -1);

    //Will go here if height is -1 and will break the loop
    cout << "Program Exiting. Thank you!\n";
    return 0;
}