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Thread: Monthly Mortage Payment Calculator

  1. #1
    Junior Member
    Join Date
    Jul 2011
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    Default Monthly Mortage Payment Calculator

    Hello. I am trying to build a mortgage calculator or program that will do the following:

    calculate the payment amount for 3 mortgage loans:
    * 7 year at 5.35%
    * 15 year at 5.5%
    * 30 year at 5.75%
    The princiaple or starting loan balance is 200,000.00 dollars.

    I know that I will be dealing with arrays (or that is how it should be done) but can not understand how to take a numbe from within side of a array and run it into a "for loop" of some kind. For example, I want to make an array for the loan term from above like so: int [] loanterm = {84,180,360}; one way of writing, or another way like so:

    int [] loanterm = new int [3]
    loanterm [0] = 84;
    loanterm [1] = 180;
    loanterm [2] = 360;
    Here is my code so far:

     * 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%
     *Use an array for the different loans. Display the mortgage
     * payment amount for each loan. 
    package mortgagecr2;
    import java.io.IOException;
    import java.text.NumberFormat;
    public class Mortgagecr2 {
      public static void main(String[] args) {
        double numB = 200000;  //Loan principle for all 3 loan packages
        double numPMT = 0.0; //balance is set to 0 until formula is ran
        int [] numY = {84,180,360}; // declared, defined, brokedown years to months
        double [] numR = {0.00448, 0.00458, 0.004792}; //declared, defined, brokedown interest
        NumberFormat money = NumberFormat.getCurrencyInstance(); // declare this statment to convert double to money in the println
        numPMT = (numB * numR) / (1 - Math.pow(1/ (1 + numR), numY)); //formula to get monthly payment amount
          for(int i= 0; i <=numY; i++)  { //this tells the program 0 is less then numY and then to run formula or println
          System.out.println ("Monthly mortgage payment for loan of" +numB + "dollars at" +numY + "month term with a rate of" +numR + "is " + money.format(numPMT)); // shows on screen the monthly payment
            if (i%12 == 0) { // this would be used to have the user see 12 println at a time on the console screen
            System.out.println ("(Enter to show the next 12 months payments)");
        try { //dunno found it as part of the IOException bit
         System.in.read(); //this too is art of the IOException to wait for user to hit a key
         catch (IOException e)	{ //java catches in memory the key pressed
           return; // returns to the program which should be the end.
         } //try
           } //if loop
          } //for loop
      } //main
    } //class
    In the
    I want to be able to say, "Monthly mortgage payment for loan of 200,000 dollars at 7 year term with a rate of 5.35 is (?) and contiune on with the other two types (15 years and 30 years and also with the intrest rates) by having the user press the enter key. I just do not know how to get or use a for loop correctly with the array and plus the system.out.println.

    I have read and read and read from my book across 4 chapters and been online to read articles from the java site and also look at other codes, but just not making the conntection with arrays and for loops. All the examples I get are always about prime numbers and nothing close to this example to make that connection for me.

    Lastly, the code will not compile and know that since this is pretty much the best I could do.

  2. #2
    Junior Member
    Join Date
    Jul 2011
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    Thanked 4 Times in 4 Posts

    Default Re: Monthly Mortage Payment Calculator

    I think you have to do like this
    edited by moderator
    Last edited by copeg; July 18th, 2011 at 09:06 AM. Reason: removed spoonfed answer

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