Code for Homework

bobbiegirl · #1 26-Feb-2007, 12:20

I have written a code for a homework assignment and would like someone to look at it and seif it is okay, it compiles and answers the questions of what the interest for the life of the loan and the number of months the repay is, but for some reason I cannot get the interest payments to be with only 2 decimals, they have several trailing numbers after the decimal.

JAVA Code:

import java.util.Scanner;

public class SteroLoan {

        public static void main(String args[]){
            int count=0;
            int numberOfMonths=0;
            double debtAmount=1000;
            double monthlyIntrest = 0.015;  //Yearly 18% i.e 1.5% monthly
            int monthlyPayment = 50;
            double totalInterestPaid =0;

             while(debtAmount>0){
                double intrestAmount = debtAmount * monthlyIntrest;

                totalInterestPaid = totalInterestPaid+ intrestAmount;


System.out.println("intrestAmount"+intrestAmount);

                double principleAmount= monthlyPayment -intrestAmount;


System.out.println("principleAmount:"+principleAmount);

                debtAmount = debtAmount - principleAmount;

                System.out.println("debtAmount :" + debtAmount);
                  count++;

            }


            System.out.println("The amount of InterestPaid:" + totalInterestPaid);
            System.out.println("Number of months :" + count);

           }



}

Can some one advise me?

Thanks

Barb

darelf · #2 26-Feb-2007, 12:49

Suggestions (These are only suggestions based on my own experience, YMMV, no warranty, no claim of fitness for any particular purpose, void where prohibited by law, no animals were harmed in the making of these suggestions with the possible exception of that dog next door who barks incessantly and deserves to be shot):

- In Java, use objects instead of base types. That is, prefer to use Double instead of double.
- When dealing with money, prefer BigDecimal to Double. The reason is, BigDecimal is "arbitrary precision", has eight user-selectable rounding modes, etc. etc.

Check it out... http://java.sun.com/j2se/1.5.0/docs/...igDecimal.html

TurboPT · #3 26-Feb-2007, 20:34

You need a 'formatter'.

Maybe the NumberFormat class, perhaps?

JAVA Code:

import java.text.NumberFormat;

Since all your code is in main, then IN main:

JAVA Code:

NumberFormat currency = NumberFormat.getCurrencyInstance();

Then, anywhere you need a value formatted, use this:

JAVA Code:

// an example wrapped around the 'intrestAmount' variable in your output:
currency.format(intrestAmount)

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Code for Homework

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Re: Code for Homework