/**
???A?bank?account?has?a?balance?that?can?be?changed?by
?
???deposits?and?withdrawals.
*/


public?class?BankAccount
{??
???
/**
??????Constructs?a?bank?account?with?a?zero?balance.
???*/


???public?BankAccount（）
???{
???
??????balance?=?0;

???}



???/**
??????Constructs?a?bank?account?with?a?given?balance.

??????@param?initialBalance?the?initial?balance
???*/


???public?BankAccount（double?initialBalance）
???{
???
??????balance?=?initialBalance;

???}



???/**
??????Deposits?money?into?the?bank?account.

??????@param?amount?the?amount?to?deposit
???*/