//SavingsAccount.java

import java.util.Scanner;

/**
 * Class of savings accounts.
 */
public class SavingsAccount
{
    private double balance;
    private static double interestRate = 0;
    private static int numberOfAccounts = 0;

    public SavingsAccount()
    {
        balance = 0;
        numberOfAccounts++;
    }

    /**
     * Sets the interest rate for all accounts.
     */
    public static void setInterestRate
    (
        double newRate
    )
    {
        interestRate = newRate;
    }

    public static double getInterestRate()
    {
        return interestRate;
    }

    public static int getNumberOfAccounts()
    {
        return numberOfAccounts;
    }

    public void deposit
    (
        double amount
    )
    {
        balance = balance + amount;
    }

    public double withdraw
    (
        double amount
    )
    {
        if (balance >= amount)
            balance = balance - amount;
        else
            amount = 0;
        return amount;
    }

    public void addInterest()
    {
        double interest = balance * interestRate; //balance * getInterestRate()
        balance = balance + interest;
    }

    public double getBalance()
    {
        return balance;
    }

    public static void showBalance
    (
        SavingsAccount account
    )
    {
        System.out.print(account.getBalance());
    }
}