/**
 * This class represents a single bank account
 */
public class BankAccount{

    // Instance variables    
    private final double INTEREST_RATE = 0.03;    
    private double balance;
    private String ownerName;
    private int accountNumber;
   
    
    /**
     * Constructs a new bank account
     * @param theName The name of the owner of the account
     * @param theAccountNum The account number
     * @param initialBalance The initial balance
     */
    public BankAccount(String theName, int theAccountNum, double initialBalance){           
        balance = initialBalance;
        ownerName = theName;
        accountNumber = theAccountNum;
    }

    /**
     * Constructs a new bank account with initial balance of $0
     * @param theName The name of the owner of the account
     * @param theAccountNum The account number
     */
    public BankAccount(String theName, int theAccountNum){
        balance = 0.0;
        ownerName = theName;
        accountNumber = theAccountNum;    
    }
    
    /**
     * Returns the account number
     * @return The account id number
     */
    public int getAccountNumber(){
        return accountNumber;
    }
    
    /**
     * Returns the name of the account owner
     * @return The name of the owner of the account
     */
    public String getOwnerName(){
        return ownerName;
    }
    
    /**
     * Returns the current balance
     * @return The current balance of the account
     */
    public double getBalance(){
        return balance;
    }
   
    /**
     * Adds interest to the account
     * @return The balance after interest has been added
     */
    public double addInterest(){
        double interest = balance * INTEREST_RATE;
        balance = balance + interest;
        return balance;
    }
    
    
    /**
     * Deposits money into the account
     * @param amount The amount of money to be deposited
     * @return The current balance after the deposit
     */
    public double deposit(double amount){
       balance = balance + amount;
       return balance;        
    }
    
    
    /**
     * Withdraws money from the account
     * @param amount The amount of money to be withdrawn
     * @return The current balance after the withdrawal
     */
    public double withdrawal(double amount){
        balance = balance - amount;
        return balance;
    }
 
    
    /**
     * Returns a String representation of the bank account
     * @return A string representing the state of the bank account
     */
    public String toString(){
        return "[current balance=" + balance + "]";
    }
}