Challenge 2: Comments & Running a Script — Solution

Save this as profile.rb, then run it from the command line with: ruby profile.rb

# profile.rb
# A short script that prints a name, a favorite number, and whether
# that number is even or odd.

=begin
This block comment documents the script's purpose:
it demonstrates both single-line comments (the # lines above and below)
and Ruby's dedicated =begin/=end block comment syntax, which PHP and
Python don't have a direct equivalent of.
=end

name = "Philip"          # a string holding the name
favorite_number = 7      # an integer to check

puts "Name: #{name}"
puts "Favorite number: #{favorite_number}"

if favorite_number.even?
  puts "#{favorite_number} is even"
else
  puts "#{favorite_number} is odd"   # .even? returns false, so this runs
end

=begin
Output:
Name: Philip
Favorite number: 7
7 is odd

Notes:
- ruby profile.rb runs the file directly from the command line, same as
  php profile.php or python profile.py — no separate compile step.
- .even? is a method call directly on the integer literal/variable, already
  previewing the "everything is an object" idea from the chapter.
- The =begin/=end block above the code is Ruby's dedicated block-comment
  syntax; PHP and Python instead reuse /* */ or triple-quoted strings for
  the same purpose.
=end