Exam 07-Jan-2018 - 06A1. Coins

/**
 * Project: Exam_07_January_2018 - created by borkins on 2018-02-05.
 */

import java.util.Scanner;

public class _06a_Coins {
    // Formatting Java Double to C# Double
    public static String getCSharpDouble(double number) {
        StringBuilder sb = new StringBuilder();
        String str = "" + number;
        char sp = new java.text.DecimalFormatSymbols().getDecimalSeparator();
        int len = (str.length() > 15) ? 15 : str.length();

        for (int i = 0; i < len; i++) {
            sb.append((str.charAt(i) != sp) ? '#' : sp);
        }
        return new java.text.DecimalFormat("" + sb).format(number);
    }

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

        double change = Double.parseDouble(scan.nextLine());
        long totalCoins = 0;

        for (int i = 0; i < 3; i++) {
            /* Add coins:
             *  2,  1  leva    (i = 0)
             *  20, 10 cents   (i = 1)
             *  2,  1  cents   (i = 2)
             */
            // The bitwise '& 1' checks for odd digit
            totalCoins += ((long) change / 2) + ((long) change & 1);

            change *= 10; // Get the next digit
            // Add coins: 50, 5 cents (i < 2)
            if (change % 10 >= 5 && i < 2) {
                totalCoins++;
                change -= 5;
            }
            // Truncate the front digits
            change = Double.parseDouble(getCSharpDouble(((change * 10) % 100) / 10));
        }

        System.out.println(totalCoins);
    }
}