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Thread: Homework

  1. #1
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    Mar 2011
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    Default Homework

    Not sure why it isnt working or what else I need to do. so any help would be great thanks

    Extend your Java Project with the following items:
    o Write the program in Java (without a graphical user interface) and have it
    calculate the payment amount for 3 mortgage loans:
     7 year at 5.35%
     15 year at 5.5%
     30 year at 5.75%
    o Use an array for the different loans. Display the mortgage payment amount for
    each loan and then list the loan balance and interest paid for each payment over
    the term of the loan. Use loops to prevent lists from scrolling off the screen.

    /*
    * To change this template, choose Tools | Templates
    * and open the template in the editor.
    */

    package MortagePaymentCalculator;

    /**
    * @Author: JDonaldson
    * Date Written: 2/26/2011
    * Program Description: Week 3 Assignment
    */

    import static java.lang.Math.*; //Import static class members
    import java.text.DecimalFormat; //Import for decimal points


    public class Test3

    {


    public static void main (String [] args)

    {

    int i = 0;
    double LoanAmount = 200000;
    double LoanBalance = 0;
    double InterestPaid = 0;
    int LoanTerm[] = {84, 180, 360};
    double Interest[] = {.0535, .0550, .0575};
    double MonthlyPayment = 0;



    DecimalFormat Currency = new DecimalFormat ("$###,###.##");
    DecimalFormat Format = new DecimalFormat("0.##");



    if (i == 0)

    {
    MonthlyPayment = LoanAmount * (((Interest[2]/12) * Math.pow((1 + (Interest[2]/12)), LoanTerm[0])) / (Math.pow((1 + (Interest[2]/12)), LoanTerm[2]) - 1));


    LoanBalance = LoanAmount - MonthlyPayment;
    InterestPaid = MonthlyPayment * Interest[0];

    //Displays calculations for first loan

    System.out.println("McBride Financial Services Mortgage Calculator");

    System.out.println("The loan amount is: $200,000");

    System.out.println("The term of the loan is:" + LoanTerm[0]);

    System.out.println("The monthly payment is: $" + Format.format(MonthlyPayment));

    System.out.println("The loan balance is: $" + Format.format(LoanBalance));

    System.out.println("The interest paid is: $" + Format.format(InterestPaid));

    System.out.println();

    }
    if (i == 1)

    {

    MonthlyPayment = LoanAmount * (((Interest[1]/12) * Math.pow((1 + (Interest[1]/12)), LoanTerm[1])) / (Math.pow((1 + (Interest[1]/12)), LoanTerm[1]) - 1));

    LoanBalance = LoanAmount - MonthlyPayment;

    InterestPaid = MonthlyPayment * Interest[1];





    //Displays mortgage calculator

    System.out.println("McBride Financial Services Mortgage Calculator");

    System.out.println("The loan amount is: $200,000");

    System.out.println("The term of the loan is:" + LoanTerm[1]);

    System.out.println("The monthly payment is: $" + Format.format(MonthlyPayment));

    System.out.println("The loan balance is: $" + Format.format(LoanBalance));

    System.out.println("The interest paid is: $" + Format.format(InterestPaid));

    System.out.println();

    }

    if (i == 2)

    {

    MonthlyPayment = LoanAmount * (((Interest[2]/12) * Math.pow((1 + (Interest[2]/12)), LoanTerm[2])) / (Math.pow((1 + (Interest[2]/12)), LoanTerm[2]) - 1));

    LoanBalance = LoanAmount - MonthlyPayment;

    InterestPaid = MonthlyPayment * Interest[2];





    //Displays mortgage calculator

    System.out.println("McBride Financial Services Mortgage Calculator");

    System.out.println("The loan amount is: $200,000");

    System.out.println("The term of the loan is:" + LoanTerm[2]);

    System.out.println("The monthly payment is: $" + Format.format(MonthlyPayment));

    System.out.println("The loan balance is: $" + Format.format(LoanBalance));

    System.out.println("The interest paid is: $" + Format.format(InterestPaid));

    System.out.println();

    }


    for (int a=1;a<361;a++) //begin loop to show 360 payments

    {

    InterestPaid = (LoanAmount * Interest[2]);



    double principalPaid = MonthlyPayment - InterestPaid;

    LoanAmount = LoanAmount - principalPaid;




    System.out.println("\nMonthly Payment " + a + " = " + Currency.format (MonthlyPayment));

    System.out.println("Loan Balance = " + Currency.format (LoanBalance));

    System.out.println("Interest Paid = " + Currency.format(InterestPaid));





    if (a%6 == 0) // pause display between screens

    {

    try

    {

    Thread.sleep(1500);

    }

    catch(InterruptedException ie) {}


    }

    }

    }

    }


  2. #2
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    Default Re: Homework

    I haven't read the calculations for correctness, but the flow of your program seems to rely on the value of i which never changes, I'm guessing by design... and I see LoanBalance is never changed in the for loop.

    From what I see, this forum doesn't like when you post the complete code and just ask for help(especially if it's Homework). They/we expect you to try and figure out a general idea of the error, and show us what steps you've tried to resolve the error. Basically show us that you've put some effort into trying to resolve the issue. When you say it's not working, elaborate a little, show a sample of the current output, and tell us the desired output.

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