import java.io.*;
import java.util.*;

class DepositAccountMain8
// Version of DepositAccountMain7 with recursive
// supplementary static methods
{
 public static void main(String[] args) throws IOException
 {
  BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
  int sum = getPosInt(in,"","Initial Deposit: ");
  double interest = getDouble(in,"","Interest Rate%: ")/100;
  DepositAccountB acc = new DepositAccountB(sum,interest);
  char command;
  do {
      StringTokenizer line;
      String num;
      do {
          System.out.print("Command: ");
          line = new StringTokenizer(in.readLine());
         }
      while(!line.hasMoreTokens());
      command = line.nextToken().charAt(0);
      switch(command)
         {
         case 'b':
            System.out.println("Balance is "+acc.balance());
            break;
         case 'n':
            acc.update();
            System.out.println("Start month with "+acc.balance());
            break;
         case 'd':
            num=line.hasMoreTokens()?line.nextToken():"";
            sum=getPosInt(in,num,"Enter Amount: ");
            acc.deposit(sum);
            break;
         case 'w':
            num=line.hasMoreTokens()?line.nextToken():"";
            sum=getPosInt(in,num,"Enter amount: ");
            try {
                 acc.withdraw(sum);
                }
            catch(AccountException e)
                {
                 System.out.print("Withdrawal refused: ");
                 if(e.getMessage().equals("overdraw"))
                    System.out.println("would make account overdrawn");
                 else
                    System.out.println("previous withdrawal this month");
                }
            break;
         case 'q':
            break;
         default:
            System.out.println("Invalid command");
         }
     }
  while(command!='q');
 }

 private static int getPosInt(BufferedReader in,String str,String prompt)
 throws IOException
 // If str represents a positive number, return that number.
 // Otherwise, print prompt then read a string from in, and
 // repeat doing so until a positive number is read
 {
  int n=0;
  str=getNonNullString(in,str,prompt);
  try {
       n=Integer.parseInt(str);
       if(n<=0)
          System.out.println("Non-positive amount entered");
      }
  catch(NumberFormatException e)
      {
       System.out.println("Not a valid figure");
      }
  if(n>0)
     return n;
  else
     return getPosInt(in,"",prompt);
 }

 private static double getDouble(BufferedReader in,String str,String prompt)
 throws IOException
 // If str represents a floating point number, return that number.
 // Otherwise, print prompt then read a string from in, and
 // repeat doing so until a floating number is read
 {
  double x;
  str=getNonNullString(in,str,prompt);
  try {
       return Double.parseDouble(str);
      }
  catch(NumberFormatException e)
      {
       System.out.println("Not a valid figure");
       return getDouble(in,"",prompt);
      }
 }

 private static String getNonNullString(BufferedReader in,String str,String prompt)
 throws IOException
 {
  if(str.equals(""))
     {
      System.out.print(prompt);
      str=in.readLine();
      return getNonNullString(in,str,prompt);
     }
  else
     return str;
 }
}