$30
CMPT 120-D400
Sample Final Exam Questions
`
Instructor: T. Donaldson CMPT 120-D400 Sample Final Exam, SFU Surrey Fall 2022
Question 1
a) (10 marks) Write a complete turtle graphics program that draws a straight line of length 300 pixels. It’s
one continuous line with no gaps. The first 10 pixels of the line are red, the next 10 pixels are green, and the
next 10 pixels are blue. This pattern repeats in the same way for each group of 10 pixels.
When done, the line will have this color pattern, where R=red, G=green, and B=blue:
R G B R G B R G B …
Each box represents a line segment 10 pixels long, and the letter is the color (don’t print the letters!).
Use turtle.color(name) to set the pen color, e.g. turtle.color('red').
Use correct syntax, correct and consistent indentation, and general good Python style in your answer. Your code
should not do any unnecessary work.
`
Instructor: T. Donaldson CMPT 120-D400 Sample Final Exam, SFU Surrey Fall 2022
b) (10 marks) Write a function called num_check(a, b, c) that works like this:
• If a, b, and c are all different, then it returns the string “all different”
• If a, b, and c are all the same, then it returns the string “all same”
• If neither of the above are true, then it returns the string “2 the same”
For example:
>>> num_check(4, 3, 10)
'all different'
>>> num_check(7, 7, 7)
'all same'
>>> num_check(4, 7, 4)
'2 the same'
Assume that the values passed into num_check are all numbers of the same type.
Use correct syntax, correct and consistent indentation, and general good Python style in your answer. Your code
should not do any unnecessary work.
`
Instructor: T. Donaldson CMPT 120-D400 Sample Final Exam, SFU Surrey Fall 2022
Question 2
a) (7 marks) Write a function called is_triangle(a, b, c) that returns True if a, b, and c can be the
lengths of the sides of a valid triangle, and False otherwise. You can assume that a, b, and c are numbers of the
same type.
a, b, and c form a valid triangle if they are each greater than 0, and if the expression 𝑠(𝑠 − 𝑎)(𝑠 − 𝑏)(𝑠 − 𝑐) is
also greater than 0. Here, s is the sum of a, b, and c, all divided by 2.
Use correct syntax, correct and consistent indentation, and general good Python style in your answer. Your code
should not do any unnecessary work.
`
Instructor: T. Donaldson CMPT 120-D400 Sample Final Exam, SFU Surrey Fall 2022
b) (13 marks) Write a complete program (it doesn't need to be in a function) that asks the user to enter the
lengths of the three sides of a triangle, and then prints the area of that triangle. Assume the user always types in
validly formatted Python floats.
If the numbers are not the lengths of the sides of a valid triangle, then print "not a valid triangle". You can use
is_triangle in your answer.
If the numbers are the lengths of the sides of a valid triangle, then print "they form a triangle of area <area>",
where <area> is replaced by the area of the triangle. Calculate the area using this formula:
𝐴𝑟𝑒𝑎 = √𝑠(𝑠 − 𝑎)(𝑠 − 𝑏)(𝑠 − 𝑐)
Here, s is the sum of a, b, and c, all divided by 2.
Hint Python’s square root function is in the math module.
Use correct syntax, correct and consistent indentation, and general good Python style in your answer. Your code
should not do any unnecessary work.
Here are four sample runs:
What is the 1st number? 8
What is the 2nd number? 4
What is the 3rd number? 5
the triangle has an area of 8.181534085976786
What is the 1st number? 8
What is the 2nd number? 8
What is the 3rd number? 8
the triangle has an area of 27.712812921102035
it's equilateral!
What is the 1st number? 0
What is the 2nd number? 9
What is the 3rd number? 5
not a valid triangle
What is the 1st number? 3
What is the 2nd number? 1
What is the 3rd number? 2
not a valid triangle
`
Instructor: T. Donaldson CMPT 120-D400 Sample Final Exam, SFU Surrey Fall 2022
`
Instructor: T. Donaldson CMPT 120-D400 Sample Final Exam, SFU Surrey Fall 2022
Question 3
A vote dictionary stores the names of candidates in an election, and how many votes they received. For
example:
{'Rick': 15, 'Morty': 3, 'Summer': 10, 'spoiled': 10}
This says Rick got 15 votes, Morty got 3, Summer got 10, and 10 other votes were spoiled (they were not filled
in, or couldn’t be read, etc.).
The key 'spoiled' may, or may not, appear in a vote dictionary. For example, these are both valid vote
dictionaries:
{'Alan': 10, 'Bo': 12, 'Cass': 13, 'spoiled': 200}
{'Alan': 10, 'Bo': 12, 'Cass': 13}
In the following questions assume that the passed-in variable vote is always a valid vote dictionary with at least
3 key/value pairs.
a) (5 marks) Write a function called get_num_votes_cast(votes) that returns the total number of votes for
all candidates. If 'spoiled' is a key in votes, then its value is not included in the total.
For example:
>>> get_num_votes_cast({'Rick': 15, 'Morty': 3, 'Summer': 10,
'spoiled': 10})
28
>>> get_num_votes_cast({'Rick': 15, 'Morty': 3, 'Summer': 10})
28
Make sure votes is not modified: it should have exactly the same contents after calling the function as before.
Use correct syntax, correct and consistent indentation, and general good Python style in your answer. Your code
should not do any unnecessary work.
`
Instructor: T. Donaldson CMPT 120-D400 Sample Final Exam, SFU Surrey Fall 2022
b) (10 marks) Write a function called get_winner_name(votes) that returns the name of the candidate who
received the most votes. For simplicity, assume that all candidates received a different number of votes.
If the special key 'spoiled' is in votes, then ignore it and do never return it as the winner.
Make sure votes is not modified: it should have exactly the same contents after calling the function as before.
For example:
>>> get_winner_name({'Rick': 15, 'Morty': 3, 'Summer': 10})
'Rick'
>>> get_winner_name({'Alan': 10, 'Bo': 12, 'Cass': 13, 'spoiled': 200})
'Cass'
Use correct syntax, correct and consistent indentation, and general good Python style in your answer. Your code
should not do any unnecessary work.