//CS5-HMC-Sp.,00-HW5-1
//A. Khakpour, Fall 98

class Bank
{
   public static void main (String args[])
   {
      Bank_Account checking = new Bank_Account(100);
      Bank_Account saving   = new Bank_Account(150);

      checking.debit(20);
      checking.credit(30);
      saving.debit(10);
      saving.credit(15);

      checking.print();
      saving.print();
   }
}

class Bank_Account
{
   private double value;
   private double balance;
   public Bank_Account(double initial_val)
   {
      balance = initial_val;
   }
   public void debit(double value)
   {
      balance -= value;
   }
   public void credit(double value)
   {
      balance += value;
   }
   private double current_balance()
   {
      return balance;
   }
   public void print()
   {
      System.out.println("balance " + current_balance());
   }
}