adding exercises ex01.rb through ex21.rb

.rbenv-version

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+1.9.2-p290

ex01.rb

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+#!/usr/bin/env ruby
+
+puts "Hello World!"
+puts "Hello Again"
+puts "I like typing this."
+puts "This is fun."
+puts 'Yay! Pringing.'
+puts "I'd much rather you 'not'."
+puts 'I "said" do not touch this.'
+

ex02.rb

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+# A comment, this is so you can read you rprogram 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:
+# print "This won't run."
+
+puts "This will run."
+

ex03.rb

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+#!/usr/bin/env ruby
+
+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
+

ex03_5.rb

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+#!/usr/bin/env ruby
+
+puts "I will now count my chickens:"
+
+puts "Hens", 25.0 + 30.0 / 6.0
+puts "Roosters", 100.0 - 25.0 * 3.0 % 4.0
+
+puts "Now I will count the eggs:"
+
+puts 3.0 + 2.0 + 1.0 - 5.0 + 4.0 % 2.0 - 1.0 / 4.0 + 6.0
+
+puts "Is it true that 3 + 2 < 5 - 7?"
+
+puts 3.0 + 2.0 < 5.0 - 7.0
+
+puts "What is 3 + 2?", 3.0 + 2.0
+puts "What is 5 - 7?", 5.0 - 7.0
+
+puts "Oh, that's why it's False."
+
+puts "How about some more."
+
+puts "Is it greater?", 5.0 > -2.0
+puts "Is it greater or equal?", 5.0 >= -2.0
+puts "Is it less or equal?", 5.0 <= -2.0
+

ex04.rb

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+#!/usr/bin/env ruby
+
+cars = 100
+space_in_a_car = 4.0
+drivers = 30
+passengers = 90
+cars_not_driven = cars - drivers
+cars_driven = drivers - car_pool_capacity
+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."
+
+

ex05.rb

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+#!/usr/bin/env ruby
+
+my_name = 'Zed A. Shaw'
+my_age = 35 # not a lie
+my_height = 74 # inches
+my_weight = 180 # lbs
+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 right
+
+puts "If I add %d, %d, and %d I get %d." % [my_age, my_height, my_weight, my_age + my_height + my_weight]
+

ex06.rb

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+#!/usr/bin/env ruby
+
+# string inside string 1
+x = "There are #{10} types of people."
+binary = "binary"
+do_not = "don't"
+# string inside string 2
+y = "Those who know #{binary} and those who #{do_not}."
+
+puts x
+puts y
+
+# string inside string 3 and 4
+puts "I said: #{x}."
+puts "I also said: '#{y}'."
+
+hilarious = false
+
+#string inside string 5
+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
+
+

ex07.rb

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+#!/usr/bin/env ruby
+
+# These 3 lines print stuff
+puts "Mary had a little lamb."
+puts "Its fleece was white as %s." % 'snow'
+puts "And everywhere that Mary went."
+
+# This line prints a period . ten times
+puts "." * 10  #what'd that do?
+
+# These 
+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 puts instead of print here. change it to puts
+# and see what happens.
+
+# Print prints all of the lines in one big line 
+# Puts puts each line on a separate line 
+
+print end1 + end2 + end3 + end4 + end5 + end6
+print end7 + end8 + end9 + end10 + end11 + end12
+print "Bingdong Dillydong"
+
+# this just is polite use of the termina, try removing it
+puts
+

ex08.rb

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+#!/usr/bin/env ruby
+
+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 coudl type up right.",
+    "But it didn't sing.",
+    "So I said goodnight."
+]
+

ex09.rb

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+#!/usr/bin/env ruby
+
+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 three double-quotes.
+We'll be able to type as much as we like.
+Even 4 lines if we want, or 5 or 6.
+PARAGRAPH
+

ex10.rb

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+#!/usr/bin/env ruby
+
+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
+

ex11.rb

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+#!/usr/bin/env ruby
+
+print "How old are you? "
+age = gets.chomp()
+print "How tall are you? "
+height = gets.chomp()
+print "How much do you weigh? "
+weight = gets.chomp()
+
+puts "So, you're #{age} old, #{height} tall and #{weight} heavy."
+
+

ex12.rb

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+#!/usr/bin/env ruby
+
+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-885901"
+    puts f.content_encoding # []
+    puts f.last_modified    # Thu Dec 05 02:45:02 UTC 2002
+end
+

ex13.rb

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+#!/usr/bin/env ruby
+
+first, second, third, fourth  = 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}"
+puts "Your fourth variable is: #{fourth}"
+
+

ex13_3.rb

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+#!/usr/bin/env ruby
+
+#first, second, third, fourth  = 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}"
+#puts "Your fourth variable is: #{fourth}"
+
+puts "Enter your 1st variable: "
+first = gets.chomp()
+
+puts "Enter your 2nd variable: "
+second = gets.chomp()
+
+puts "Enter your 3rd variable: "
+third = gets.chomp()
+
+puts "Enter your 4th variable: "
+fourth = gets.chomp()
+
+puts "These are your variables #{first} #{second} #{third} #{fourth}"
+

ex14.rb

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+#!/usr/bin/env ruby
+
+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
+

ex15.rb

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+#!/usr/bin/env ruby
+
+# Take the first agrument at the command line and assign it to the variable "filename"
+filename = ARGV.first
+
+# Set the variable "prompt" to a carat
+prompt = "> "
+# We call the open method on the class File. The argument is the contents of the variable "filename".
+# I think what's happening here is that the class File is being called upon to open "filename" and assign it to the variable "txt"
+# That's not what's happening. When I "puts txt" I get this #<File:0x10016ac78>
+# It looks like txt is being assigned the location of the file or something like that
+txt = File.open(filename)
+
+# We're printing the contents of the variable "filename"
+puts "Here's your file: #{filename}"
+# We "call a function" on the variable "txt". So does that make "txt" a class? WTF? This is awesome but WTF?
+# We call the function "read" with no arguments on txt and we puts that to stdout
+puts txt.read()
+
+## Puts some text
+#puts "Type the filename again:"
+## Puts a prompt
+#print prompt
+## Take the user's input, chomp i.e. remove any new line or return or whatever at the end and assign it to the variable "file_again"
+#file_again = STDIN.gets.chomp()
+#
+## file_again is a variable containing the name of our file
+## We're going to assign a file object to txt_again?
+#txt_again = File.open(file_again)
+#
+## We read our file object and puts it to stdout
+#puts txt_again.read()
+

ex15_1.rb

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+#!/usr/bin/env ruby
+
+# Take the first agrument at the command line and assign it to the variable "filename"
+filename = ARGV.first
+
+print "I'm gonna let you finish but first I just wanna say this: "
+puts File.atime(filename)
+
+# We call the open method on the class File. The argument is the contents of the variable "filename".
+# I think what's happening here is that the class File is being called upon to open "filename" and assign it to the variable "txt"
+# That's not what's happening. When I "puts txt" I get this #<File:0x10016ac78>
+# It looks like txt is being assigned the location of the file or something like that
+txt = File.open(filename)
+
+# We're printing the contents of the variable "filename"
+puts "Below this line I'm gonna print the contents of this file here: #{filename}"
+# We "call a function" on the variable "txt". So does that make "txt" a class? WTF? This is awesome but WTF?
+# We call the function "read" with no arguments on txt and we puts that to stdout
+puts txt.read()
+
+txt.close()