## Homework help: looping problems

Hi,

My homework this week is to create a program that shows the return on an investment. It must ask the user to input the amount of the investment, the number of years, and the interest rate. (if a zero is entered, an error message must instruct the user that was an invalid input) I need the program to then print out the amount of the investment year by year, ie, my output should look like this. I've put in random numbers as an example:

Enter investment amount: 100

Enter number of years: 3

Enter interest rate (as a decimal): .05

Your investment at 5.0 percent is:

After year 1 \$105.00
After year 2 \$110.25
After year 3 \$115.76

And so on, depending on the number of years the user entered at the prompt. I'm having trouble with a) getting the output to print by year instead of as one lump sum, and b) how to define a number in the loop that I don't know yet. I want to use "final int MAX" for that, but I'm not sure how.

I'm also having a problem getting the "not enough information message" to display without the investment output statement printing out afterward. Should I use an else statement for the output? I keep getting problems when I try to do that.

Can anyone help me out with some advice? My code is below.

import java.text.*;
import java.util.*;
public class Investment {

public static void main(String[] args)
{
DecimalFormat df = new DecimalFormat();
df.setMaximumFractionDigits(2);
df.setMinimumFractionDigits(2);

double investment;
double growth;
double rate;
int years;

Scanner input = new Scanner(System.in);

System.out.print("Enter investment amount: ");
investment = input.nextDouble();

System.out.print("Enter number of years: ");
years = input.nextInt();

System.out.print("Enter interest rate (as a decimal): ");
rate = input.nextDouble();

if (investment <= 0||years <=0 ||rate<=0)
{
System.out.println("Not enough information - amount must be non-zero.");
}

growth = investment * rate * years;

System.out.println("Your investment at " + rate + " is " + df.format(growth));

}
}