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

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

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: https://repl.it/repls/TeemingMicroHandwritingrecognition

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

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 : https://repl.it/repls/HoneydewGrouchyMetrics

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

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: https://repl.it/repls/TeemingMicroHandwritingrecognition

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

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: https://repl.it/repls/HeavenlyBusyNet

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])

Question 6 - Strange Calculator Problem Statement: Write a program that takes a string as an input, such as “24 + 16”, “30 – 5”, “10 * 4”, 36 / 2”, compute the equation found in the string and output the equation and its result such as 24 + 16 = 40 Requirements: Note that the output, such as 24 + 16 = 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.