Exercise

$(1)$ Write the full BankAccount class, knowing that:

BankAccount $($ account number : String, balance :

double $)$: constructor defines the account number and the

starting balance.

This method updates all the static member variables. The

accounts count should be incremented, and the balance should be

added to the total balances.

BankAccount$($BankAccount other$)$ is a copy constructor.

withdraw $($ amount : double $)$ : withdraws the specified

amount from the account.

If sufficient funds are available: the method updates the balance by

subtracting the amount, then sets last transaction type to

"Withdraw", and sets last transaction amount to the value of the

parameter amount'.

Otherwise, If the amount is not available, a warning message should

be displayed indicating that "the amount is not available".

This method updates the static variable 'total balances' by

subtracting the amount, if sufficient funds are available.