A function that returns a special error code is usually better accomplished throwing an exception instead. The following class maintains an account balance.

class Account

{

private:

double balance;

public:

Account()

{

balance = 0;

}

Account( double initialDeposit)

{

balance = initialDeposit;

}

double getBalance()

{

return balance;

}

// returns new balance or -1 if error

double deposit( double amount)

{

if (amount > 0)

balance += amount;

else

return -1;

return balance;

// Code indicating error

}

// returns new balance or -1 if invalid amount

double withdraw( double amount)

{

if ((amount > balance) || (amount < 0))

return -1;

else

balance -= amount;

return balance;

}

};

Rewrite the class so that it throws appropriate exceptions instead of returning -1 as an error code. Write test code that attempts to withdraw and deposit invalid amounts and catches the exceptions that are thrown.