Exercises for Programmers

Solutions for Exercises for Programmers, by Brian Hogan

Plan

I'm going to implement the solution to each exercise in a handful of languages. Largely I hope to cover the exercises with Ruby and Go, and later Haskell, Python, Elm, Rust, or C.

Each exercise has a few "challenges" appended, elaborating on the original problem. I'm going to ignore this on the first run through, then revisit them subsequently.

Organization

Each exercise will have its own self-contained sub-directory within this repository including a README to document the problem and related details.

Within each exercise directory will be sub-directories enclosing solutions, one per language.

Running the Solutions

How to execute the implemented solutions will depend on each language, among other things.

Ruby

All solutions were written with Ruby 2.2.3 (MRI/CRuby). With a compatible Ruby installed they should all be executable in the usual fashion, by passing the file name to the interpreter.

$ ruby solution.rb

Additionally, all of the Ruby solutions have a "shebang" (#!) specified, so you may be able to execute them directly, depending.

$ ./solution.rb

Go

All solutions in Go are written against 1.5.2. They can be built or run as-is in the given directory, if you have the Go platform installed.

$ go build main.go
$ ./main

$ go run main.go

The Exercises

1. Saying Hello
2. Counting the Number of Characters
3. Printing Quotes
4. Mad Lib
5. Simple Math
6. Retirement Calculator
7. Area of a Rectangular Room
8. Pizza Party
9. Paint Calculator
10. Self-Checkout
11. Currency Conversion
12. Computing Simple Interest
13. Determining Compound Interest
14. Tax Calculator
15. Password Validation
16. Legal Driving Age
17. Blood Alcohol Calculator
18. Temperature Converter
19. BMI Calculator
20. Multistate Sales Tax Calculator
21. Numbers to Names
22. Comparing Numbers
23. Troubleshooting Car Issues
24. Anagram Checker
25. Password Strength Indicator
26. Months to Pay Off a Credit Card
27. Validating Inputs
28. Adding Numbers
29. Handling Bad Input
30. Multiplication Table
31. Karvonen Heart Rate
32. Guess the Number Game
33. Magic 8 Ball
34. Employee List Removal
35. Picking a Winner
36. Computing Statistics
37. Password Generator
38. Filtering Values
39. Sorting Records
40. Filtering Records
41. Name Sorter
42. Parsing a Data File
43. Website Generator
44. Product Search
45. Word Finder
46. Word Frequency Finder
47. Who’s in Space?
48. Grabbing the Weather
49. Flickr Photo Search
50. Movie Recommendations
51. Pushing Notes to Firebase
52. Creating Your Own Time Service
53. Todo List
54. URL Shortener
55. Text Sharing
56. Tracking Inventory
57. Trivia App