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.
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