import java.util.Scanner;

public class BillCalculator {

public void startBillCalculator() {

int people = enterNumberOfPeople();

Calculator calculator = new Calculator();

calculator.enterListOfItems();

System.out.println("Добавленные товары:");

calculator.printNamesItems();

double amountPerPerson = calculator.calculate(people);

printAmountPerPerson(amountPerPerson);

}

private int enterNumberOfPeople() {

Scanner scanner = new Scanner(System.in);

while (true) {

System.out.println("Введите количество людей");

if (scanner.hasNextInt()) {

int n = scanner.nextInt();

if (n > 1) {

return n;

}

}

scanner.nextLine();

System.out.println("Вы ввели некорректное количество людей");

}

}

private void printAmountPerPerson(double amountPerPerson) {

String ruble;

int intAmountPerPerson = (int) amountPerPerson;

if (intAmountPerPerson % 100 >= 10 && intAmountPerPerson % 100 <= 20) {

ruble = "рублей";

} else {

switch (intAmountPerPerson % 10) {

case 1:

ruble = "рубль";

break;

case 2:

case 3:

case 4:

ruble = "рубля";

break;

default:

ruble = "рублей";

}

}

System.out.printf("С каждого человека %.2f %s", amountPerPerson, ruble);

}

}