Exam 24-Apr-2016 - 01. Repairing the Tiles

/**
 * Project: Exam_24_April_2016 - created by borkins on 2017-05-14.
 */

import java.text.DecimalFormat;
import java.util.Scanner;

public class _01_RepairingTiles
{
    public static void main(String[] args)
    {
        Scanner console = new Scanner(System.in);

        int areaLength = Integer.parseInt(console.nextLine());
        double tileWidth = Double.parseDouble(console.nextLine());
        double tileLength = Double.parseDouble(console.nextLine());
        int benchWidth = Integer.parseInt(console.nextLine());
        int benchLength = Integer.parseInt(console.nextLine());

        int areaToFill = (areaLength * areaLength) - (benchWidth * benchLength);
        double tilesArea = tileWidth * tileLength;
        double tilesNeeded = areaToFill / tilesArea;
        double timeMin = tilesNeeded * 0.2;

        System.out.println(doubleToCSharpDouble(tilesNeeded));
        System.out.println(doubleToCSharpDouble(timeMin));
    }

    public static String doubleToCSharpDouble(double number)
    {
        StringBuilder sb = new StringBuilder();
        String str = "" + number;
        int len = (str.length() > 16) ? 16 : str.length();

        for (int i = 0; i < len; i++)
        {
            if (str.charAt(i) != '.') {
                sb.append("#");
            }
            else {
                sb.append(".");
            }
        }
        return new DecimalFormat(sb.toString()).format(number);
    }
}