Can't get loop to work

[rockybalboa]

Hello,
Can anyone advise me on why I can't get the following code to loop? I'm trying to get continuous calculation until the variable amount = 0.
I will work out display params after I get the loop to work. I'm new to Java, but not coding. This is a simple program so there's probably a simple answer.
My thanks to anyone willing to teach me.
Thanks
DW

import java.text.*;

class Wk3
{
    public static void main (String[] arguments)    //create main
    {
        int term = 30;                              //init var for length of loan
        double amount = 200000;                        //init var for loan amt
        double pmt = 0;                             //init var for payment
        double rate = .0575;                        //init var for interest rate
        double rateMo = 0;                          //init var for monthly interest paid        
        {
            rate = (rate/12);                       //divide annual rate to get monthly rate
            term = (term * 12);                     //multiply years to get length in months            
            pmt= (amount * (rate)) / (1-Math.pow(1 + rate, - term));    //compute payment
            {
                if (amount > 0)                         //run if counter >0
                {
                    java.text.DecimalFormat dec = new java.text.DecimalFormat(",###.00");               //format next output to dollars.cents
                    System.out.println("\nThis months payment is $" + dec.format (pmt));                //display payment
                    System.out.println ("\nYour loan balance is $" + dec.format (amount));              //display loan amt
                    System.out.println("\nThis months interest is $" + dec.format (amount * (rate )));  //montly interest payment
                }
                amount -=  pmt;
            }
        }
    }
}

[nimaj]

Why aren't you using a while loop? while (amount != 0) { statements; }

[rockybalboa]

Thank you for giving me a hand,
I changed to a while loop and it loops ok, but it's not decrementing so it just keeps running.
Any ideas?

[sde]

can you post your while loop? it seems like the only way the amount variable would not decrement is if the payment was 0.

[rockybalboa]

After taking your advice and a little more searching I got the following code that runs and decrements great. Suddenly I realize that my algorithm isn't working. It's supposed to calculate the loan over 360 months (30 years), but my code runs the pricipal to zero in 189 months. And it looks like the reason is that it is calculating the interest wrong.
I'm about to lose my mind on this project.

import java.text.*;

class Wk3
{
    public static void main (String[] arguments)    //create main
    {
        int term = 30;                              //init var for length of loan
        double rate = .0575;                        //init var for interest rate
        double amount = 200000;                        //init var for loan amt
        double pmt = 0;
        
        rate = (rate/12);                       //divide annual rate to get monthly rate
        term = (term * 12);                     //multiply years to get length in months
        pmt= amount * ((rate) / (1-Math.pow(1 + rate, - term)));    //compute payment
        
        while (amount > 0 & term > 0 )                         //run if counter >0
                {
                    java.text.DecimalFormat dec = new java.text.DecimalFormat(",###.00");               //format next output to dollars.cents
                    System.out.println("\nThis months payment is $" + dec.format (pmt));                //display payment
                    System.out.println ("\nYour loan balance is $" + dec.format (amount));              //display loan amt
                    System.out.println("\nThis months interest is $" + dec.format (amount * (rate )));  //montly interest payment
                    System.out.println("\nThis months term is " + (term));
                    term --;
                    amount -=  pmt;
        }
    }
}

[Belisarius]

Arg, C style Java . . .

Anyways, stylistic comments aside, you're using "&" in your while loop. This doesn't do what you think it does. You want "&&", which is a boolean AND. "&" is a binary AND.