Family Trip

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        double budget = Double.parseDouble(scanner.nextLine());
        int overnights = Integer.parseInt(scanner.nextLine());
        double overnightPrice = Double.parseDouble(scanner.nextLine());
        int additionalCosts = Integer.parseInt(scanner.nextLine());

        if (overnights > 7) {
            overnightPrice *= 0.95;
        }

        budget -= overnightPrice * overnights + 0.01 * budget * additionalCosts;

        if (budget >= 0) {
            System.out.printf("Ivanovi will be left with %.2f leva after vacation.\n", budget);
        } else {
            System.out.printf("%.2f leva needed.\n", Math.abs(budget));
        }
    }
}

Решение с тернарен оператор:

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        double budget = Double.parseDouble(scanner.nextLine());
        int overnights = Integer.parseInt(scanner.nextLine());
        double overnightPrice = Double.parseDouble(scanner.nextLine());
        int additionalCosts = Integer.parseInt(scanner.nextLine());

        budget -= overnightPrice * (overnights > 7 ? 0.95 : 1) * overnights + 0.01 * budget * additionalCosts;

        System.out.printf(
                (budget >= 0
                        ? ("Ivanovi will be left with %.2f leva after vacation.\n")
                        : ("%.2f leva needed.\n")), Math.abs(budget)
        );
    }
}