cs3723 Homework #9,Due: 2pm, 4/24/08
Note: If you collaborated with your classmates or used their notes, please note which classmates you collab-
orated with. If you use an external source, besides the text book, lectures, notes provided by the instructor,
and your own intellect, please cite that source. Use quote marks if you are quoting material word-for-word
from any source (including the text book).
Simula (Chapter 11)
1. (a) What was the first Object-Oriented language?
(b) In what decade was it created?
(c) Who designed it?
(d) For what purpose was it designed?
2. (a) What features does Simula 67 have that Algol 60 did not have? (List
four.)
(b) What features of Algol 60 were left out of Simula 67? (List four.)
(c) What are coroutines?
3. (a) What is a class in Simula 67? What Algol 60 entity did it evolve from?
(b) What is an object in Simula 67? What implementation construct did it
evolve from?
(c) Where are objects allocated in Simula 67?
4. (a) Which of the “four basic object-oriented concepts” was missing from
Simula 67?
(b) What is a “prefixed” class? How are they declared? What process is
used to create an object of such a “prefix class?”
(c) In Simula 67, if B is a subclass of A, a is a variable of type ref(A) and
b is a variable of type ref(B), what can happen if a program assigns the
contents of a to b? (There are two possibilities. Describe them both and
under what circumstance each can happen.)
5. Do exercise 11.1on p.327ff in Mitchell. But note that there is a typo and the
first line of the code should read: ref(Point) r; instead of ref(Point) p;.
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