using Microsoft.VisualBasic;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Diagnostics;
using System.Text.RegularExpressions;

static class Module1
{

    public static void Main()
    {
        Console.WriteLine("Rectangular single-room carpeting jobs price quote");
        string input = null;
        int roomLength = findRoomLength();
        int roomWidth = findRoomWidth();
        int price = findPricePerYard();
        double squareYardage = findSquareYardage(roomLength, roomWidth);
        double materialcost = findMaterialCost(squareYardage, price);
        double totalcost = 0;
        do {
            Console.WriteLine("Room Length = " + roomLength);
            Console.WriteLine("Room Width = " + roomWidth);
            Console.WriteLine("Price per square yard = $" + price);
            Console.WriteLine("Square Yardage of room = " + squareYardage);
            Console.WriteLine("Material cost = $" + materialcost);
            if (((materialcost) < 800)) {
                Console.WriteLine("Installation cost = $200");
                totalcost = 200 + materialcost;
            } else {
                Console.WriteLine("Installation cost is free because material cost exceeded $800");
                totalcost = materialcost;
            }
            Console.WriteLine("Total cost = $" + totalcost);
            input = Console.ReadLine();
        } while (true);
        Console.WriteLine("Quitting now.");
    }
    private static int findRoomLength()
    {
        string input = null;
        do {
            Console.WriteLine("Please enter room length in ft");
            input = Console.ReadLine();
            if ((onlyNumbers(input) == false)) {
                Console.WriteLine("Input only numbers");

            }
        } while ((onlyNumbers(input) == false & input.Length > 0));
        return input;
    }
    private static int findRoomWidth()
    {
        string input = null;
        do {
            Console.WriteLine("Please enter room width in ft");
            input = Console.ReadLine();
            if ((onlyNumbers(input) == false)) {
                Console.WriteLine("Input only numbers");

            }
        } while ((onlyNumbers(input) == false & input.Length > 0));
        return input;
    }
    private static int findPricePerYard()
    {
        string input = null;
        do {
            Console.WriteLine("Please enter the price of the carpeting material on a per-square-yard basis");
            input = Console.ReadLine();
            if ((onlyNumbers(input) == false)) {
                Console.WriteLine("Input only numbers");

            }
        } while ((onlyNumbers(input) == false & input.Length > 0));
        return input;
    }
    private static bool onlyNumbers(string str)
    {
        return str.All(char.IsNumber);
    }
    private static double findSquareYardage(int length, int width)
    {
        double yardLength = length / 3;
        double yardWidth = width / 3;
        return yardLength * yardWidth;
    }
    private static double findMaterialCost(double squareyards, int pricePerYard)
    {
        return pricePerYard * squareyards;
    }
}