1. Lecture 17 – Practice Exercise 3 SOLUTIONS
CMPT 120
Lecture 17 – Practice Exercise 3
SOLUTIONS

2. Goals for Today!
Practise designing a solution (algorithm) to a problem
Practise implementing a program (solution) described by an algorithm

3. Question 1 Homework – from a few lectures’ ago!
Problem Statement:
Given 3 numbers, find the largest one.
How to proceed:
Write an algorithm, i.e., steps, in pseudocode (not in Python) on the supplied piece of paper
Write your name
Submit at the end of the lecture
Possible solution:

4. Question 1 – Handout – Page 1 Homework – from a few lectures’ ago!
Problem Statement:
Given 3 numbers, find the largest one.

5. Question 2 Problem Statement: How to proceed:
Given 2 words, figure out if they are palindromes.
How to proceed:
Write an algorithm, i.e., steps, in pseudocode (not in Python) on the supplied piece of paper
Write your name
Submit at the end of the lecture
Possible solution :

6. Question 2 – Handout – Page 2
Problem Statement:
Given 2 words, figure out if they are palindromes.

7. Question 3 – Homework – from a few lectures’ ago!
Problem Statement:
Let’s create a function that returns the largest number out of 3 numbers
Requirements:
You cannot use the max( ) built-in function
You cannot use the word max to name your function
How to proceed:
Implement your algorithm in Python using Repl.It
No submission required
Possible solution:

8. Question 4 – Back to our Guessing Game
Remember our Guessing Game program from Lecture 7 (May 22), have a look at its version 4 on our course web site
List an input for which this Guessing Game version 4 works just fine!
input: three wrong numbers
input: two numbers then the correct number
List an input for which this Guessing Game version 4 does not work well (its behaviour does not make sense) !
input: the correct number first
input: a wrong number then the correct number

9. Question 4 – Back to our Guessing Game
Problem Statement:
Fix our Guessing Game version 4 (hence creating version 5)
This signifies that when you enter the input you listed in 2. on the previous slide, our Guessing Game version 5 will work just fine!
Possible solution:

10. Question 5 - Loops
Let’s convert the following Python code fragment such that it no longer uses a while loop but instead, it uses a for loop:
fruit = ["banana", "apple", "plum"]
index = 0
while index < len(fruit):
print(fruit[index])
index = index + 1
Solution:
for index in range(len(fruit)) :
  print(fruit[index])

11. Question 6 - Strange Calculator
Problem Statement:
Write a program that takes a string as an input, such as “ ”, “30 – 5”, “10 * 4”, 36 / 2”, compute the equation found in the string and output the equation and its result such as = 40
Requirements:
Note that the output, such as = 40, is no longer made of strings, but they are all integers
Your program cannot make use of functions such as eval( ), etc…
Please, feel free to send your solution to this question to the instructor for feedback.