In a ____, all rows from the table on the left (the table listed first in the query) will be included regardless of whether they match rows from the table on the right (the table listed second in the query).
A. left inner join
B. left outer join
C. right inner join
D. right outer join
Answer: B
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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.
A method that returns a special error code can sometimes cause problems. The caller might ignore the error code or treat the error code as a valid return value. In this case it is better to throw an exception instead. The following class maintains an account balance and returns a special error code. ``` { private double balance; public Account() { balance = 0; } public Account(double initialDeposit) { balance = initialDeposit; } public double getBalance() { return balance; } // returns new balance or -1 if error public double deposit(double amount) { if (amount > 0) balance += amount; else return -1; // Code indicating error return balance; } // returns new balance or -1 if invalid amount public double withdraw(double amount) { if ((amount > balance) || (amount < 0)) return -1; else balance -= amount; return balance; } } ``` This solution throws a NegativeAmount and InsufficientBalance exception. It is worth pointing out to the students the problems that would occur if negative account balances were desirable.
The three events handled by pygame are ______, _______ and _______.
Fill in the blank(s) with the appropriate word(s).
A ________ is a group of related classes in the Framework Class Library.
a) classpace b) directory c) namespace d) cluster
Why is green often used as a background color for chromakey effects?
What will be an ideal response?