Untitled

package com.helloWorld;

import java.text.NumberFormat;
import java.util.Scanner;

public class Mortgage {
    public static void main(String[] args) {
        final byte MONTHS_IN_YEAR = 12;
        final byte PERCENT = 100;

        int principal = 0;
        float monthlyInterest = 0;
        int numberOfPayments = 0;

        Scanner scanner = new Scanner(System.in);

        while (true) {
            System.out.print("Principal ($1k - $1M): ");
            principal = scanner.nextInt();
            if (principal >= 1_000 && principal <= 1_000_000)
                break;
            System.out.println("Enter a number between 1,000 and 1,000,000");
        }

        while (true) {
            System.out.print("Annual Interest Rate: ");
            float annualInterest = scanner.nextFloat();
            if (annualInterest >= 1 && annualInterest <= 30) {
                monthlyInterest = annualInterest / PERCENT / MONTHS_IN_YEAR;
                break;
            }
            System.out.println("Enter a number greater than 0 and less than or equal to 30");

        }

        while (true) {
            System.out.print("Period (Years): ");
            int years = scanner.nextInt();
            numberOfPayments = years * MONTHS_IN_YEAR;
            if (years >= 1 && years <= 30)
                break;
            System.out.println("Enter a number between 1 and 30");

        }

            double mortgageTotal = principal
                    * (monthlyInterest * Math.pow(1 + monthlyInterest, numberOfPayments))
                    / (Math.pow(1 + monthlyInterest, numberOfPayments) - 1);

            String formatedTotal = NumberFormat.getCurrencyInstance().format(mortgageTotal);

            System.out.println("Mortgage: " + formatedTotal);

        }
    }