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CSC1015F 2018 test2-MEMO
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Course
Computer science1015 (CSC1015F)
257 Documents
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University of Cape Town
Academic year: 2018/2019
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University of Cape Town ~~ Department of Computer Science
Computer Science 1015F ~~ 2018
Class Test 2
Marks : 35
Time : 40 minutes
Instructions:
1. Answer all questions.
2. Write your answers in PEN.
3. All questions refer to version 3 of the Python programming language.
Question 1 [8]
Examine the Q1 module listed below and answer the following questions.
#Q1
print("--Welcome to the sandwich constructor--")
print(“(Other than bread) tell us what you want”)
ing = input("Another ingredient? Y/y/N/n")
while ing== 'Y' or 'y' or 'N' or 'n':
ing = input("What ingredient do you want?")
ing = “{:$^11}”.format(ing)
print("Okay, we'll add",ing)
#ing = input("Another ingredient? Y/y/N/n")
(a) Does the last line being commented out make the while loop an infinite loop? Why or why
not?
No [1] is infinite whether it’s commented out or not[1]
because strings (e.) “y” always evaluate to True [1] thus
the condition or <string> will always be True [1] [4]
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(b) What exactly would line 6, ing = “{:$^11}”.format(ing) do if ing =
“cheese”?
ing = “$$cheese$$$” [2] if perfect, else [1] if have at least 1 ‘$’ before and after ‘cheese’ [2]
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(c) What are the purposes of the break , continue statements?
Break exits immediately from a loop [1]
Continue immediately starts the next iteration of the loop [1]
[2]
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Question 2 [17]
(a) Write a function, ingredient_rev_up, that reverses the (approximately) first half of an
ingredient string character by character using the length of the ingredient string, and converts the
2 nd half into uppercase and then returns the reversed ingredient
Funky(5,5,9)
[4]
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7 5 1 [2]
All values are equal! [2]
Question 3 [10]
(a) What is the difference between primary and secondary storage? Give an example of each.
Primary storage: data not lost when PC switched off [1]
e. RAM [1]
Secondary storage: data accessible only when PC on [1]
e. HDD [1 [4]
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(b) Why are programming languages (e. Python) more suitable for writing programs than natural
(human) languages such as English?
Human languages ambiguous and imprecise [1]
Programming languages precise syntax and semantics[1]
[2]
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(c) Name two ways to convert a program from a high level language (e. Python) to machine
language. Give the differences (if any) between these two ways.
Compilation and interpretation [2]
Compilation: a program that translates a program one-shot.
Only reads the source code once. [1]
Interpretation: a program that analyses and executes
instruction by instruction as necessary. Need it every time
the program is to be run [1].
[4]
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Was this document helpful?
CSC1015F 2018 test2-MEMO
Course: Computer science1015 (CSC1015F)
257 Documents
Students shared 257 documents in this course
University: University of Cape Town
Was this document helpful?
University of Cape Town ~~ Department of Computer Science
Computer Science 1015F ~~ 2018
Class Test 2
Marks : 35
Time : 40 minutes
Instructions:
1. Answer all questions.
2. Write your answers in PEN.
3. All questions refer to version 3 of the Python programming language.
