Answer:
The answer is below
Explanation:
There are cases where the use of a NULL value would be appropriate in a computer programming situation. These cases can be summarily described below:
The first case is in a situation where the value of the attribute of a certain element is known to exist, but the value can not be found
The second case is in a situation where the value of the attribute of a certain element is not known whether it exists or not.
Answer:
The answer to the above questions is given in explanation section:
Explanation:
abstraction hides the details about a specific piece of information.
The suitable match for this is Data
Because the word "Piece of information " can only be referred to data not to process.
Now look at the second
abstraction hides the details about a specific process
The suitable match here is procedural.
because specific process can only be referred to procedure not to data.
Answer:D is the answer to this one
Answer:
c. Book and Periodical are subclasses of LoanableItem
Explanation:
Books are kept in library in a periodical manner. Both classes are not superior, they are subclasses of LoanableItem. Library uses common guide which makes it easy to find a book.
