import java.util.Scanner;

public class Calculator {
    private int first;
    private int second;

    public Calculator(int first, int second) {
        this.first = first;
        this.second = second;
    }

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int operation = getOperation(scanner);
        int first = getNumberFromUser("Enter first number", scanner);
        int second = getNumberFromUser("Enter second number", scanner);
        Calculator calc = new Calculator(first, second);
        int operationResult = processOperation(operation, calc);
        System.out.println(operationResult);
        int operation1 = getOperation(scanner);
        int first1 = getNumberFromUser("Enter first number", scanner);
        int second1;
        if (operation1 == 3) ;
        while (true) {
            second1 = getNumberFromUser("Enter second number", scanner);
            if (second1 != 0) {
                break;

            }
        }
    }else

    {
        second1 = getNumberFromUser("enter second number", Scanner);
    }

    Calculator calc1 = new Calculator(first1, second1);
    System.out.println(calc1,first/calc1.second);



        /*System.out.println("choose operation");
        System.out.println("1-plus");
        System.out.println("2-minus");

        Scanner scanner = new Scanner(System.in);
        int operation = scanner.nextInt();
        System.out.println("enter number 1");
        int First = scanner.nextInt();

        System.out.println("enter number 2");
        int Second = scanner.nextInt();

        Calculator calc=new Calculator(First, Second);
        if(operation==1){
            System.out.println(calc.plus());
        }else if(operation==2){
            System.out.println(calc.minus());
        }*/
}

    public int plus() {
        return first + second;
    }

    public int minus() {
        return first - second;
    }

    public static int getOperation(Scanner scanner) {
        int op = 1;
        while (true) {
            System.out.println("choose operation");
            System.out.println("1 - plus");
            System.out.println("2 - minus");
            System.out.println("3 - delit'");
            op = scanner.nextInt();
            if (op == 1 || op == 2 || op == 3) {
                break;
            } else {
                System.out.println("enter only 1 or 2");
            }
        }
        return op;

    }


    public static int getNumberFromUser(String messege, Scanner scanner) {
        System.out.println(messege);
        int result = scanner.nextInt();
        return result;
    }

    public static int processOperation(int operation, Calculator calculator) {
        int result = 0;
        if (operation == 1) {
            result = calculator.plus();

        } else if (operation == 2) {
            result = calculator.minus();
        } else {
            result = 0;
        }
        return result;

    }

}