05. Coins

РЕШЕНИЕ БЕЗ ЦИКЪЛ:

import java.util.Scanner;

public class Coins {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        double input = Double.parseDouble(scanner.nextLine());
        int change = (int) (input * 100), coinCount = 0;

        if (change >= 200) {
            coinCount += change / 200;
            change %= 200;
        }
        if (change >= 100) {
            coinCount += change / 100;
            change %= 100;
        }
        if (change >= 50) {
            coinCount += change / 50;
            change %= 50;
        }
        if (change >= 20) {
            coinCount += change / 20;
            change %= 20;
        }
        if (change >= 10) {
            coinCount += change / 10;
            change %= 10;
        }
        if (change >= 5) {
            coinCount += change / 5;
            change %= 5;
        }
        if (change >= 2) {
            coinCount += change / 2;
            change %= 2;
        }
        if (change == 1) {
            coinCount++;
            change--;
        }

        System.out.println(coinCount);
    }
}

РЕШЕНИЕ С WHILE / FOR:

import java.util.Scanner;

public class Coins {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        double input = Double.parseDouble(scanner.nextLine());
        int change = (int) (input * 100), coinCount = 0;

        while (change > 0) {    // ИЛИ:  for (int i = 0; change > 0; i++) {
            if (change >= 200) {
                change -= 200;
            } else if (change >= 100) {
                change -= 100;
            } else if (change >= 50) {
                change -= 50;
            } else if (change >= 20) {
                change -= 20;
            } else if (change >= 10) {
                change -= 10;
            } else if (change >= 5) {
                change -= 5;
            } else if (change >= 2) {
                change -= 2;
            } else {
                change--;
            }
            coinCount++;
        }

        System.out.println(coinCount);
    }
}

ИЛИ:

РЕШЕНИЕ С ТЕРНАРЕН ОПЕРАТОР:

import java.util.Scanner;

public class Coins {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        double input = Double.parseDouble(scanner.nextLine());
        int change = (int) (input * 100), coinCount = 0;

        while (change > 0) {    // ИЛИ:  for (int i = 0; change > 0; i++) {
            while (change != 0) {

                change -=
                        change >= 200 ? 200 :
                                change >= 100 ? 100 :
                                        change >= 50 ? 50 :
                                                change >= 20 ? 20 :
                                                        change >= 10 ? 10 :
                                                                change >= 5 ? 5 :
                                                                        change >= 2 ? 2 : 1;
                coinCount++;
            }
        }

        System.out.println(coinCount);
    }
}

ОПТИМИЗИРАНО РЕШЕНИЕ:

import java.util.Scanner;

public class Coins {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        double input = Double.parseDouble(scanner.nextLine());
        int change = (int) (input * 100), coinCount = 0;

        for (int coin : new int[]{200, 100, 50, 20, 10, 5, 2, 1}) {
            if (change >= coin) {
                coinCount += change / coin;
                change %= coin;
            }
        }

        System.out.println(coinCount);
    }
}