import java.util.Scanner;

/**
  Page 116 Programming Exercise 3.
  This program illustrates using constants, variables, and arithmetic
  operations.
 */

public class MortgagePaymentDemo {

  public static final double ANNUAL_INTEREST_RATE = 7.49;
  public static final int NUMBER_OF_MONTHS_PER_YEAR = 12;

  public static void main( String[] args ) {

    Scanner inp = new Scanner(System.in);

    System.out.print("What is the monthly mortgage payment amount? ");
    double monthlyMortgagePayment = inp.nextDouble();

    System.out.print("How much is owed on the mortgage? " );
    double outstandingBalance = inp.nextDouble();

    double monthlyInterestRate = ANNUAL_INTEREST_RATE / NUMBER_OF_MONTHS_PER_YEAR;
    double interestPayment = monthlyMortgagePayment * monthlyInterestRate;
    double principalPayment = monthlyMortgagePayment - interestPayment;

    System.out.println( "Monthly Interest Payment: " + interestPayment );
    System.out.println( "Monthly Principal Payment: " + principalPayment );
  }
}