Add 'lrthw-remnants/' from commit '2b0a814a1795c60baf29b95462921b0ec8c7d861'

git-subtree-dir: lrthw-remnants
git-subtree-mainline: f2380eef05
git-subtree-split: 2b0a814a17

lrthw-remnants/.gitignore

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+*~
+copied.txt
+.rbenv-version

lrthw-remnants/ex1.rb

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+puts "Hello World!"
+puts "Hello Again"
+puts "I like typing this."
+puts "This is fun."
+puts 'Yay! Printing.'
+puts "I'd much rather you 'not'."
+puts 'I "said" do not touch this.'

lrthw-remnants/ex10.rb

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+tabby_cat = "\tI'm tabbed in."
+persian_cat = "I'm split\non a line."
+backslash_cat = "I'm \\ a \\ cat."
+
+fat_cat = <<MY_HEREDOC
+I'll do a list:
+\t* Cat food
+\t* Fishies
+\t* Catnip\n\t* Grass
+MY_HEREDOC
+
+puts tabby_cat
+puts persian_cat
+puts backslash_cat
+puts fat_cat

lrthw-remnants/ex11.rb

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+print "How old are you? "
+age = gets.chomp
+print "How tall are you? "
+height = gets.chomp
+print "Howmuch do you weigh? "
+weight = gets.chomp
+
+puts "So, you're #{age} old, #{height} tall, and #{weight} heavy."

lrthw-remnants/ex12.rb

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+require 'open-uri'
+
+open("http://www.ruby-lang.org/en") do |f|
+  f.each_line {|line| p line}
+  puts f.base_uri         # <URI::HTTP:0x40e6ef2 URL:http://www.ruby-lang.org/en/>
+  puts f.content_type     # "text/html"
+  puts f.charset          # "iso-8859-1"
+  puts f.content_encoding # []
+  puts f.last_modified    # Thu Dec 05 02:45:02 UTC 2002
+end

lrthw-remnants/ex13.rb

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+first, second, third = ARGV
+
+puts "The script is called: #{$0}"
+puts "Your first variable is: #{first}"
+puts "Your second variable is: #{second}"
+puts "Your third variable is: #{third}"
+
+print "And your fourth is?: "
+puts "That's right, it's #{STDIN.gets.chomp}"

lrthw-remnants/ex14-ec.rb

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+user = ARGV.first
+prompt = '~: '
+
+puts "Hi #{user}, I'm the #{$0} script."
+puts "I'd like to ask you a few questions."
+puts "Do you like me #{user}?"
+print prompt
+likes = STDIN.gets.chomp
+
+puts "Where do you live #{user}?"
+print prompt
+lives = STDIN.gets.chomp
+
+puts "What kind of computer do you have?"
+print prompt
+computer = STDIN.gets.chomp
+
+puts "What's your favorite name for a dog?"
+print prompt
+dogname = STDIN.gets.chomp
+
+puts <<MESSAGE
+Alright, so you said #{likes} about liking me.
+You live in #{lives}.  Not sure where that is.
+And you have a #{computer} computer.  Nice.
+You also said that your favorite name for a
+dog is #{dogname}.  Works for me.
+MESSAGE

lrthw-remnants/ex14.rb

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+user = ARGV.first
+prompt = '> '
+
+puts "Hi #{user}, I'm the #{$0} script."
+puts "I'd like to ask you a few questions."
+puts "Do you like me #{user}?"
+print prompt
+likes = STDIN.gets.chomp()
+
+puts "Where do you live #{user}?"
+print prompt
+lives = STDIN.gets.chomp()
+
+puts "What kind of computer do you have?"
+print prompt
+computer = STDIN.gets.chomp()
+
+puts <<MESSAGE
+Alright, so you said #{likes} about liking me.
+You live in #{lives}.  Not sure where that is.
+And you have a #{computer} computer.  Nice.
+MESSAGE

lrthw-remnants/ex15-ec.rb

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+filename = ARGV.first
+
+prompt = "> "
+txt = File.new(filename)
+
+puts "Here's your file: #{filename}"
+puts txt.read
+
+puts "I'll also ask you to type it again:"
+print prompt
+file_again = STDIN.gets.chomp
+
+txt_again = File.new(file_again)
+
+puts txt_again.read
+
+txt.close
+txt_again.close

lrthw-remnants/ex15.rb

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+filename = ARGV.first
+
+prompt = "> "
+txt = File.open(filename)
+
+puts "Here's your file: #{filename}"
+puts txt.read()
+
+puts "I'll also ask you to type it again:"
+print prompt
+file_again = STDIN.gets.chomp()
+
+txt_again = File.open(file_again)
+
+puts txt_again.read()

lrthw-remnants/ex15_sample.txt

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+This is stuff I typed into a file.
+It is really cool stuff.
+Lots and lots of fun to have in here.

lrthw-remnants/ex16-ec.rb

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+filename = ARGV.first
+script = $0
+
+puts <<EOF
+We're going to erase #{filename}.
+If you don't want that, hit CTRL-C (^C).
+If you do want that, hit RETURN.
+EOF
+
+print "? "
+STDIN.gets
+
+puts "Opening the file..."
+target = File.open(filename, 'w')
+
+puts "Truncating the file.  Goodbye!"
+target.truncate(target.size)
+
+puts "Now I'm going to ask you for three lines"
+
+print "line 1: "; line1 = STDIN.gets.chomp
+print "line 2: "; line2 = STDIN.gets.chomp
+print "line 3: "; line3 = STDIN.gets.chomp
+
+puts "I'm going to write these to the file."
+
+target.write("#{line1}\n#{line2}\n#{line3}\n")
+
+puts "And finally, we close it."
+target.close

lrthw-remnants/ex16.rb

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+filename = ARGV.first
+script = $0
+
+puts "We're going to erase #{filename}."
+puts "If you don't want that, hit CTRL-C (^C)."
+puts "If you do want that, hit RETURN."
+
+print "? "
+STDIN.gets
+
+puts "Opening the file..."
+target = File.open(filename, 'w')
+
+puts "Truncating the file.  Goodbye!"
+target.truncate(target.size)
+
+puts "Now I'm going to ask you for three lines"
+
+print "line 1: "; line1 = STDIN.gets.chomp()
+print "line 2: "; line2 = STDIN.gets.chomp()
+print "line 3: "; line3 = STDIN.gets.chomp()
+
+puts "I'm going to write these to the file."
+
+target.write(line1)
+target.write("\n")
+target.write(line2)
+target.write("\n")
+target.write(line3)
+target.write("\n")
+
+puts "And finally, we close it."
+target.close()

lrthw-remnants/ex17-ec.rb

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+File.open(ARGV.first) { |i| File.open(ARGV[1], 'w') { |o| o.write(i.read) }}

lrthw-remnants/ex17.rb

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+from_file, to_file = ARGV
+script = $0
+
+puts "Copying from #{from_file} to #{to_file}"
+
+# we could do these two on one line too, how?
+input = File.open(from_file)
+indata = input.read()
+
+puts "The input file is #{indata.length} bytes long"
+
+puts "Does the output file exist? #{File.exists? to_file}"
+puts "Ready, hit RETURN to continue, CTRL-C to abort."
+STDIN.gets
+
+output = File.open(to_file, 'w')
+output.write(indata)
+
+puts "Alright, all done."
+
+output.close()
+input.close()

lrthw-remnants/ex18.rb

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+# this one is like your scripts with argv
+def puts_two(*args)
+  arg1, arg2 = args
+  puts "arg1: #{arg1}, arg2: #{arg2}"
+end
+
+# ok, that *args is actually pointless, we can just do this
+def puts_two_again(arg1, arg2)
+  puts "arg1: #{arg1}, arg2: #{arg2}"
+end
+
+# this just takes one argument
+def puts_one(arg1)
+  puts "arg1: #{arg1}"
+end
+
+# this one takes no arguments
+def puts_none()
+  puts "I got nothin'."
+end
+
+puts_two("Zed", "Shaw")
+puts_two_again("Zed", "Shaw")
+puts_one("First!")
+puts_none()

lrthw-remnants/ex19.rb

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+def cheese_and_crackers(cheese_count, boxes_of_crackers)
+  puts "You have #{cheese_count} cheeses!"
+  puts "You have #{boxes_of_crackers} boxes of crackers!"
+  puts "Man that's enough for a party!"
+  puts "Get a blanket."
+  puts # a blank line
+end
+
+puts "We can just give the function numbers directly:"
+cheese_and_crackers(20, 30)
+
+puts "OR, we can use variables from our script:"
+amount_of_cheese = 10
+amount_of_crackers = 50
+cheese_and_crackers(amount_of_cheese, amount_of_crackers)
+
+puts "We can even do math inside too:"
+cheese_and_crackers(10 + 20, 5 + 6)
+
+puts "And we can combine the two, variables and math:"
+cheese_and_crackers(amount_of_cheese + 100, amount_of_crackers + 1000)

lrthw-remnants/ex2.rb

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+# A comment, this is so you can read your program later.
+# Anything after the # is ignored by Ruby.
+
+puts "I could have code like this." # and the comment after is ignored.
+
+# You can also use a comment to "disable" or comment out a piece of code:
+# puts "This won't run."
+
+puts "This will run."

lrthw-remnants/ex20.rb

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+input_file = ARGV.first
+
+def print_all(f)
+  puts f.read
+end
+
+def rewind(f)
+  f.seek(0, IO::SEEK_SET)
+end
+
+def print_a_line(line_count, f)
+  puts "#{line_count} #{f.readline}"
+end
+
+current_file = File.open(input_file)
+
+puts "First let's print the whole file:"
+puts # a blank line
+
+print_all(current_file)
+
+puts "Now let's rewind, kind of like a tape."
+
+rewind(current_file)
+
+puts "Let's print three lines:"
+
+current_line = 1
+print_a_line(current_line, current_file)
+
+current_line += 1
+print_a_line(current_line, current_file)
+
+current_line += 1
+print_a_line(current_line, current_file)

lrthw-remnants/ex21.rb

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+def add(a, b)
+  puts "ADDING #{a} + #{b}"
+  a + b
+end
+
+def subtract(a, b)
+  puts "SUBTRACTING #{a} - #{b}"
+  a - b
+end
+
+def multiply(a, b)
+  puts "MULTIPLYING #{a} * #{b}"
+  a * b
+end
+
+def divide(a, b)
+  puts "DIVIDING #{a} / #{b}"
+  a / b
+end
+
+puts "Let's do some math with just functions!"
+
+age = add(30, 5)
+height = subtract(78, 4)
+weight = multiply(90, 2)
+iq = divide(100, 2)
+
+puts "Age: #{age}, Height: #{height}, Weight: #{weight}, IQ: #{iq}"
+
+# A puzzle for the extra credit, type it in anyway.
+puts "Here is a puzzle."
+
+what = add(age, subtract(height, multiply(weight, divide(iq, 2))))
+
+puts "That becomes: #{what} Can you do it by hand?"

lrthw-remnants/ex24.rb

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+puts "Let's practice everything."
+puts "You\'d need to know \'bout escapes with \\ that do \n newlines and \t tabs."
+
+poem = <<MULTI_LINE_STRING
+
+\tThe lovely world
+with logic so firmly planted
+cannot discern \n the needs of love
+nor comprehend passion from intuition
+and requires an explanation
+\n\t\twhere there is none.
+
+MULTI_LINE_STRING
+
+puts "--------------"
+puts poem
+puts "--------------"
+
+five = 10 - 2 + 3 - 6
+puts "This should be five: #{five}"
+
+def secret_formula(started)
+  jelly_beans = started * 500
+  jars = jelly_beans / 1000
+  crates = jars / 100
+  return jelly_beans, jars, crates
+end
+
+start_point = 10000
+beans, jars, crates = secret_formula(start_point)
+
+puts "With a starting point of: #{start_point}"
+puts "We'd have #{beans} beans, #{jars} jars, and #{crates} crates."
+
+start_point = start_point / 10
+
+puts "We can also do that this way:"
+puts "We'd have %s beans, %s jars, and %s crates." % secret_formula(start_point)

lrthw-remnants/ex3.rb

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+puts "I will now count my chickens:"
+
+puts "Hens", 25 + 30 / 6
+puts "Roosters", 100 - 25 * 3 % 4
+
+puts "Now I will count the eggs:"
+
+puts 3 + 2 + 1 - 5 + 4 % 2 - 1 / 4 + 6
+
+puts "Is it true that 3 + 2 < 5 - 7?"
+
+puts 3 + 2 < 5 - 7
+
+puts "What is 3 + 2?", 3 + 2
+puts "What is 5 - 7?", 5 - 7
+
+puts "Oh, that's why it's false."
+
+puts "How about some more."
+
+puts "Is it greater?", 5 > -2
+puts "Is it greater or equal?", 5 >= -2
+puts "Is it less or equal?", 5 <= -2

lrthw-remnants/ex4.rb

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+cars = 100
+space_in_a_car = 4.0
+drivers = 30
+passengers = 90
+cars_not_driven = cars - drivers
+cars_driven = drivers
+carpool_capacity = cars_driven * space_in_a_car
+average_passengers_per_car = passengers / cars_driven
+
+puts "There are #{cars} cars available."
+puts "There are only #{drivers} drivers available."
+puts "There will be #{cars_not_driven} empty cars today."
+puts "We can transport #{carpool_capacity} people today."
+puts "We have #{passengers} passengers to carpool today."
+puts "We need to put about #{average_passengers_per_car} in each car."

lrthw-remnants/ex5.rb

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+my_name = 'Zed A. Shaw'
+my_age = 35
+my_height = 74
+my_weight = 180
+my_eyes = 'Blue'
+my_teeth = 'White'
+my_hair = 'Brown'
+
+puts "Let's talk about %s." % my_name
+puts "He's %d inches tall." % my_height
+puts "He's %d pounds heavy." % my_weight
+puts "Actually that's not too heavy."
+puts "He's got %s eyes and %s hair." % [my_eyes, my_hair]
+puts "His teeth are usually %s depending on the coffee." % my_teeth
+
+# this line is tricky, try to get it exactly right
+puts "If I add %d, %d, and %d I get %d." % [
+    my_age, my_height, my_weight, my_age + my_height + my_weight]

lrthw-remnants/ex6.rb

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+x = "There are #{10} types of people."
+binary = "binary"
+do_not = "don't"
+y = "Those who know #{binary} and those who #{do_not}."
+
+puts x
+puts y
+
+puts "I said: #{x}"
+puts "I also said: '#{y}'."
+
+hilarious = false
+joke_evaluation = "Isn't that joke so funny?! #{hilarious}"
+
+puts joke_evaluation
+
+w = "This is the left side of..."
+e = "a string with a right side."
+
+puts w + e

lrthw-remnants/ex7.rb

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+puts "Mary had a little lamb."
+puts "Its fleece was white as %s." % 'snow'
+puts "And everywhere that Mary went."
+puts "." * 10  # what'd that do?
+
+end1 = "C"
+end2 = "h"
+end3 = "e"
+end4 = "e"
+end5 = "s"
+end6 = "e"
+end7 = "B"
+end8 = "u"
+end9 = "r"
+end10 = "g"
+end11 = "e"
+end12 = "r"
+
+# notice how we are using print instead of puts here.  change it to puts
+# and see what happens.
+print end1 + end2 + end3 + end4 + end5 + end6
+print end7 + end8 + end9 + end10 + end11 + end12
+
+# this just is polite use of the terminal, try removing it
+puts

lrthw-remnants/ex8.rb

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+formatter = "%s %s %s %s"
+
+puts formatter % [1, 2, 3, 4]
+puts formatter % ["one", "two", "three", "four"]
+puts formatter % [true, false, false, true]
+puts formatter % [formatter, formatter, formatter, formatter]
+puts formatter % [
+    "I had this thing.",
+    "That you could type up right.",
+    "But it didn't sing.",
+    "So I said goodnight."
+]

lrthw-remnants/ex9.rb

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+# Here's some new strange stuff, remember type it exactly.
+
+days = "Mon Tue Wed Thu Fri Sat Sun"
+months = "Jan\nFeb\nMar\nApr\nMay\nJun\nJul\nAug"
+
+puts "Here are the days: ", days
+puts "Here are the months: ", months
+
+puts <<PARAGRAPH
+There's something going on here.
+With the PARAGRAPH thing
+We'll be able to type as much as we like.
+Even 4 lines if we want, or 5, or 6.
+PARAGRAPH

lrthw-remnants/test.txt

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+To all the people out there.
+I say I don't like my hair.
+I need to shave it off.