Lab: Program Execution

Objectives

By the end of this exercise a student should be able to:

• Read programs to determine their flow
• Comment programs to document their flow
• Reason about the results that a program will return

Instructions, Reading

• Fork this exercise on Github, and clone it to your system
• Run bundle install to ensure that you have all needed ruby gems needed for this program
• Follow along and comment the code in lib/triangle.rb and lib/triangle/valid_triangle.rb
• (optional) follow along and comment the tests in spec/valid_triangle_spec.rb. Try out the tests by running rspec spec/valid_triangle_spec.rb

Instructions, Writing (Your Turn)

• In lib/is_prime.rb write a method (we will go more into these soon) that returns true or false if a number is prime.
• Do not use gets or puts.
• Test your results by running rspec spec/is_prime_spec.rb

Additional Resources

• Prime Numbers, Wikipedia
• In Depth, How Ruby Executes Your Code