Java debuggung

Hey guys this is my first post and I kind of need the answer ASAP, as it is due by midnight tonight (yes I know, way to procrastinate right?). I am taking an online Java programming class and I have been struggling but I actually fully debugged this program... or so I thought. When I went to run it, it allows me to enter all my info, but after the last calculation, I get this error message(also pictured below):
"Exception in thread "main" java.lang.ArithmeticException: / by zero
at bert.Bert.main(Bert.java:40)
BUILD FAILED (total time: 18 seconds)"
Can anyone help please?? I have my code attached as 2 images, but in case you'd rather view it in text, here is my code:

package bert;
import java.io.*;

public class Bert {

public static void main(String[] args) throws IOException{
BufferedReader dataIn = new BufferedReader (new InputStreamReader(System.in));
//Declaring Variables
int price, downpayment, tradeIn, months,loanAmt=0, interest =0;
double annualInterest, payment;
String custName, inputPrice,inputDownPayment,inputTradeIn,inputMonths, inputAnnualInterest;
//Get Input from User
System.out.println("What is your name?");
custName = dataIn.readLine();
System.out.print("What is the price of the car?");
inputPrice = dataIn.readLine();
System.out.print("What is the downpayment?");
inputDownPayment = dataIn.readLine();
System.out.print("What is the trade-in value?");
inputTradeIn = dataIn.readLine();
System.out.print("For how many months is the loan?");
inputMonths = dataIn.readLine();
System.out.print("What is the decimal interest rate?");
inputAnnualInterest = dataIn.readLine();
//Conversions
price = Integer.parseInt(inputPrice);
downpayment = Integer.parseInt(inputDownPayment);
tradeIn = Integer.parseInt(inputTradeIn);
months = Integer.parseInt(inputMonths);
annualInterest =Double.parseDouble(inputAnnualInterest);
//Calculations
payment=loanAmt/((1/interest)-(1/(interest*Math.round(1+ months))));
//Output
System.out.print("The monthly payment for " + custName + " is $");
System.out.println((int)payment);
}
/**
* @param args the command line arguments
*/

// TODO code application logic here
}

Quote:

---

"Exception in thread "main" java.lang.ArithmeticException: / by zero
at bert.Bert.main(Bert.java:40)

---

What variable has the zero value when line 40 is executed?
Can the code test for the zero and not try to divide by it?

Note: The images are too fuzzy when enlarged. Can you copy and paste line 40 here along with the preceding statements that show the values of all the variables used in line 40.
Be sure to wrap the code in code tags. Use the # button above the input box:

Code:

---

int x  = 3;

---

Sorry about the photos! Here is my code with numbered lines.

Code:

---

14 public static void main(String[] args) throws IOException{
15    BufferedReader dataIn = new BufferedReader (new InputStreamReader(System.in));
16    //Declaring Variables
17    int price, downpayment, tradeIn, months,loanAmt=0, interest =0;
18    double annualInterest, payment;
19    String custName, inputPrice,inputDownPayment,inputTradeIn,inputMonths, inputAnnualInterest;
20    //Get Input from User
21    System.out.println("What is your name?");
22    custName = dataIn.readLine();
23    System.out.print("What is the price of the car?");
24    inputPrice = dataIn.readLine();
25    System.out.print("What is the downpayment?");
26    inputDownPayment = dataIn.readLine();
27    System.out.print("What is the trade-in value?");
28    inputTradeIn = dataIn.readLine();
29    System.out.print("For how many months is the loan?");
30    inputMonths = dataIn.readLine();
31    System.out.print("What is the decimal interest rate?");
32    inputAnnualInterest = dataIn.readLine();
33    //Conversions
34    price = Integer.parseInt(inputPrice);
35    downpayment = Integer.parseInt(inputDownPayment);
36    tradeIn = Integer.parseInt(inputTradeIn);
37    months = Integer.parseInt(inputMonths);
38    annualInterest =Double.parseDouble(inputAnnualInterest);
39    //Calculations
40    payment=loanAmt/((1/interest)-(1/(interest*Math.round(1+ months))));
41    //Output
42    System.out.print("The monthly payment for " + custName + " is $");
43    System.out.println((int)payment);
44 }

---

When posting code, please use code tags as per Norm's post #2. Go Advanced, select the formatted code and click '#'.

Cheers!

Code:

---

payment=loanAmt/((1/interest)-(1/(interest*Math.round(1+ months))));

---

You use interest here which is set to 0 in line 17, but here

Code:

---

annualInterest =Double.parseDouble(inputAnnualInterest);

---

you set annualInterest!

PS loadAmt is set to 0 in line 17 but never updated!

What variable has the zero value when line 40 is executed?

Thanks so much!! I am very very new to Java and have much to learn. Thank you for your help!