1  /**

  2     This program computes the time required to double an investment.

  3  */

  4  public class DoubleInvestment

  5  {

  6     public static void main(String[] args)

  7     {  

  8        final double RATE = 5;

  9        final double INITIAL_BALANCE = 10000;

 10        final double TARGET = 2 * INITIAL_BALANCE;

 11        

 12        double balance = INITIAL_BALANCE;

 13        int year = 0;

 14  

 15        // Count the years required for the investment to double

 16  

 17        while (balance < TARGET)

 18        {  

 19           year++;

 20           double interest = balance * RATE / 100;

 21           balance = balance + interest;

 22        }

 23        

 24        System.out.println("The investment doubled after "

 25           + year + " years.");

 26     }

 27  }