//Copyright (c) 2002 Art Gittleman
//This example is provided WITHOUT ANY WARRANTY 
//either expressed or implied.

/* Modifies the BankAccount class to include a class variable 
 * to store the total number of successful Deposit, Withdraw, 
 * and GetBalance operations by any Acct object.
 */

public class Acct {
  private double balance;               // instance variable  
  private static int transactions = 0;  // class variable                                                             
  public Acct()   {
    balance = 0;
  }

  public Acct(double initialAmount) {
    balance = initialAmount;
  }

    // Increments transactions
  public void Deposit(double amount) {  // instance method 
    balance += amount;
    transactions++;
  }

    /* Only increments transactins if the
     * withdrawal is successful.
     */
  public double Withdraw(double amount) {
    if (balance >= amount){
      balance -= amount;
      transactions++;
      return balance;
    }
    else
      return -1.0;
  } 
  public double GetBalance() { 
    transactions++;  
    return balance;
  }
  public static int GetTransactionCount() {   // class method
    return transactions;
  }
}