// Example of a static (or class) method, and parameter passing.

/* Compute the value of a bank account after a specified period
   of time assuming that the initial balance and the annual interest
   rate are given, and the interest is compounded monthly. */

import java.util.*;

class BankAcc {

   public static final int numberOfMonths = 12;

   public static void main (String[] args)  {

   float balance, rate;
   int years;
   Scanner scan = new Scanner (System.in);

   System.out.print ("Enter initial balance: ");
   System.out.flush ();
   balance = scan.nextFloat();

   System.out.print ("Enter annual interest rate (in %): ");
   System.out.flush ();
   rate = scan.nextFloat();
   
   System.out.print ("Enter period of time (in years): ");
   System.out.flush ();
   years = scan.nextInt();

   float newBalance = computeValue(rate, balance, years);

   if (newBalance != 0) {
      System.out.print ("For initial balance of $" + balance + " and ");
      System.out.println ("annual interest of " + rate + "%, ");
      System.out.print ("the new balanace after " + years + " years will be $");
      System.out.println (newBalance);
     }
   else    
      System.out.println ();
   }

/* 
  Computes the value of an investment and return the balance after the 
  specified period, years. */

   public static float computeValue (float rate, float balance, int years) {

     if (years < 0 || rate < 0 || balance < 0) {
       System.out.println ("Incorrect input. Try again with correct input data.");
       return 0;
     }
     else {
     float b = (float) (balance * Math.pow(1 + rate/(numberOfMonths*100), numberOfMonths*years));
     return b;
     }
   }
}