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UNIVERSITY EXAMINATIONS UNIVERSITEITSEKSAMENS
UNlSAI~
INF1511 October/November 2019
Visual Programming I
Duration 2 Hours 70 Marks
EXAMINERS
FIRST MRSPMGOUWS
SECOND DRVZMZAZI
Closed book exammation
This examination question paper remains the property of the University of South Africa and may not be
removed from the exammatton venue
This exarrunatton question paper consists of 5 pages
Instructions
• Answer all the questions in the answer book
• Answers m pencil will not be marked.
• The marks are provided m brackets next to the questions
• Good luck!
Duration 2 hours
Marks 70
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2
INF1S11
OCTOBER/NOVEMBER 2019
Question 1 Multiple-choice questions [10]
.
INSTRUCTION· Select the correct OPTION
Question Options Answers
a) Comments m Python begin with a 1 #
2 II
3 *
4 &&&
b) What format code rs used to display 1 %a
ASCII code? 2 %s
3 %1
4 %c
c) The function which returns the data 1 datatype()
type of an object rs 2 type_()
3 obJect_O
4 data()
d) An example of an immutable 1 lists
sequence m Python rs 2 integers
3 stnngs
4 floats
e) The index value of the last element m 1 z
a hst rs 2 -1
3 0
4 1
f) rs a special method that rs 1 1mt
automatically invoked right after a 2 pnnt
new mstance of a class rs created 3 str
4 class
g) Which file access mode option 1 a+
opens a file for reading and 2 A
appends contents to the end of the 3 a
file? 4 r+
h) What will be the content of file 1 Tea Coffee Espresso
snackorder txt after the following 2 T eaCoffeeEsoresso
code has been executed? 3 TEA COFFEE ESPRESSO
4 Tea
f open (" snackordertxt", "w+")
=
Coffee
lst~['Tea', 'Coffee', 'Espresso' l
Espresso
f w£Ltelines(lst)
f close ()
1) A class that implements only the 1 data descriptor
_get_ method for an object rs 2 getter class
called a 3 fetch class
4 non-data-descriptor
J) What rs the output of 1 Tea
pr1nt(snack.get("Tea"))? 2 Tea 1
3 TEA
snack={ "Tea" .1,"Coffee" 2, 4 1
"Espresso" 3}
-
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INF1511
OCTOBER/NOVEMBER 2019
Question 2 Programming (30]
a) Use an if ... else statement and write a program that asks the user for mput of the time
m hours (1 to 24} for the day If the time value rs greater than 6 and less than 18, then
the program must output a comment 'Have a Happy Day',else the comment must be
'Rest Well' Please name the program and provide at least one code comment (5)
b) Write a function thedifference Wnte a program that outputs the difference between
the first and the second input numerical values The input values must be requested
from the user The values must be passed to the function, and the difference value rs
returned The output should reflect both the input and output values Please name
the program and provide at least one code comment (10)
c) Ask the user for a random number and assign the value to a variable named starting
Then using a for loop and write a program that asks the user for input of 5 numbers
Each of these numbers must be added to the m1t1al value of the variable starting. The
output must be the mmal and final value of the variable starting. Please name the
program and provide at least one code comment (5)
d) Write a program that will ask the user to input words as two strings, and will assign the
strings to variables word1 and word2 The program must jom the strings word1 and
word2 with the Jom function with a space between the strings The output must be
displayed m caprtal letters Please name the program and provide at least one code
comment ( 10)
Question 3 Object Orientation [10)
a) Consider the following code to define a class Identify the class object and a class
attribute (2)
class student:
studentnum =0
studentorder = ''
deli veryto = ''
print (student.deliveryto)
b) Given the class definition above, explain how an instance of the class rs created You
may use a coded example to clarify (2)
c) Motivate one benefit of usmg classes m programming (1)
d) Explam why garbage collecnon rs required m programmmg You may use a coded
example to clarify (1)
e) A class may have two types of methods, namely class methods and static methods
Briefly explain a difference between these two types of methods You may use a coded
example to clarify ( 4)
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