A good answer might be:

The completed program is given below.

In completing the program, be sure that rate is correct. The user is supposed to enter percent interest, for example 6 for six percent. The program needs a decimal fraction such as 0.06 to work correctly.

import java.io.*;
class  dollarsAfterForty
{

  public static void main( String[] args ) throws IOException
  {
    double dollars = 1000.00 ;
    double rate;
    int    year =  1 ;     

    // get the interest rate from the user
    String rateChars;
    BufferedReader stdin = new BufferedReader( new InputStreamReader(System.in) );
    System.out.println("Enter the interest rate in percent:"); 
    rateChars = stdin.readLine(); 
    rate      = ( Double.valueOf( rateChars ) ).doubleValue();
    rate      = rate/100.0;
 
    while (  year <= 40 )
    {
      // add another year's interest
      dollars =  dollars + dollars*rate ; 

      // add in this year's contribution
      dollars = dollars + 1000 ;

      year    =  year + 1 ;
    }

    System.out.println("After 40 years at " + rate*100 
      + " percent interest you will have " + dollars + " dollars" );
  }

}

Here is an example of a user dialog with the program:

C:\users\default\JavaLessons\chap16>java dollarsAfterForty
Enter the interest rate in percent:
11
After 40 years at 11.0 percent interest you will have 646826.9337201559 dollars

C:\users\default\JavaLessons\chap16>java dollarsAfterForty
Enter the interest rate in percent:
12
After 40 years at 12.0 percent interest you will have 860142.3907860613 dollars

C:\users\default\JavaLessons\chap16>java dollarsAfterForty
Enter the interest rate in percent:
13
After 40 years at 13.0 percent interest you will have 1146485.7949682677 dollars

QUESTION 7:

In the above dialog, the user keeps trying interest rates until one is found where the account reaches the million dollar goal. In terms of computer programming, what is the user doing?