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pushing learn to program examples
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‎pre-course/learn_to_program/01-chapter_2_numbers/REPL examples.rb‎

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# Learn to Program - Second Edition
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# Examples from book
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# Sam Gerber
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# Chapter 2 - Numbers
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puts 1 + 2 # => 3
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# 2.4 Simple Arithmetic
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puts 1.0 + 2.0 # => 3.0
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puts 2.0 * 3.0 # => 6.0
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puts 5.0 - 8.0 # => -3.0
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puts 9.0 / 2.0 # => 4.5
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puts 1 + 2 # => 3
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puts 2 * 3 # => 6
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puts 5 - 8 # => -3
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puts 9 / 2 # => 4
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puts 5 * (12-8) + -15 # =>5
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puts 98 + (59872 / (13*8)) * -51 # =>-29227

‎pre-course/learn_to_program/01-chapter_2_numbers/examples.rb‎

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‎pre-course/learn_to_program/02-chapter_3_letters/REPL_examples.rb‎

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# Learn to Program - Second Edition
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# Examples from book
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# Sam Gerber
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# Chapter 3 - letters
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puts 'Hello, world!'# =>Hello, world!
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puts '' # =>
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puts 'Good-bye.' # =>Good-bye.
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# 3.1 String Arithmetic
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puts 'I like' + 'apple pie' # =>I likeapple pie
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puts 'I like ' + 'apple pie' # =>I like apple pie
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puts 'I like' + ' apple pie' # =>I like apple pie
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puts 'blink ' * 4 # => blink blink blink blink
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# 3.2 12 vs. '12'
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puts 12 + 12 # =>24
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puts '12' + '12' # =>1212
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puts '12 + 12' # =>12 + 12
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puts 2 * 5 # =>10
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puts '2' * 5 # =>22222
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puts '2 * 5' # =>2 * 5
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# 3.3 Problems
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puts '12' + 12 # => ...no implicit conversion of Fixnum into String
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puts '2' * '5' # => ...no implicit conversion of String into Integer
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#Escape characters
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puts 'You\'re swell!' # =>You're swell!
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puts 'backslash at the end of a string: \\' # =>backslash at the end of a string: \
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puts 'up\\down' # =>up\down
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puts 'up\down' # =>up\down
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‎pre-course/learn_to_program/03-chapter_4_variables_and_assignment/REPL_examples.rb‎

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# Learn to Program - Second Edition
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# Examples from book
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# Sam Gerber
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# Chapter 4 - Variables and Assignment
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puts '...you can say that again...' # =>...you can say that again...
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puts '...you can say that again...' # =>...you can say that again...
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my_string = '...you can say that again...'
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puts my_string # =>...you can say that again...
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puts my_string # =>...you can say that again...
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name = 'Anya Christina Emmanuella Jenkins Harris'
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puts 'My name is ' + name + '.'
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puts 'Wow! ' + name
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puts 'is a really long name!'
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# =>My name is Anya Christina Emmanuella Jenkins Harris.
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# =>Wow! Anya Christina Emmanuella Jenkins Harris
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# =>is a really long name!
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composer = 'Mozart'
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puts composer + ' was "da bomb" in his day.'
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composer = 'Beethoven'
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puts 'But I prefer ' + composer + ', personally.'
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# =>Mozart was "da bomb" in his day.
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# =>But I prefer Beethoven, personally.
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my_own_var = 'just another ' + 'string'
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puts my_own_var
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my_own_var = 5 * (1+2)
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puts my_own_var
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# =>just another string
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# =>15
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var1 = 8
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var2 = var1
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puts var1
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puts var2
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puts ''
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var1 = 'eight'
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puts var1
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puts var2
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# =>8
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# =>8
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# =>
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# =>eight
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# =>8

‎pre-course/learn_to_program/04-chapter_5_mixing_it_up/00-full_name_greeting.rb‎

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# Learn to Program - Second Edition
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# Exercise from Chapter 5 - Mixing It Up
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# Sam Gerber
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# Write a program that asks for a person's first name, then middle, and then
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# last. Finally, it should greet the person using their full name.
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def full_name_greeting
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puts 'Please type your first name.'
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first_name = gets.chomp
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puts 'Please type your middle name.'
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middle_name = gets.chomp
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puts 'Please type your last name.'
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last_name = gets.chomp
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puts "Hello, #{first_name} #{middle_name} #{last_name}!"
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end
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full_name_greeting

‎pre-course/learn_to_program/04-chapter_5_mixing_it_up/01-bigger_better_favorite_number.rb‎

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# Learn to Program - Second Edition
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# Exercise from Chapter 5 - Mixing It Up
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# Sam Gerber
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# Write a program that asks for a person's favorite number.
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# Have your program add 1 to the number, and then
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# suggest the result as a bigger and better favorite number.
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def bigger_better_favorite_number
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puts 'Please type your favorite number.'
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favorite_number = gets.chomp.to_i
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bigger_better_number = favorite_number + 1
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puts "Here's a bigger and better favorite number: #{bigger_better_number}!"
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end
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bigger_better_favorite_number

‎pre-course/learn_to_program/04-chapter_5_mixing_it_up/REPL_examples.rb‎

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# Learn to Program - Second Edition
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# Examples from book
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# Sam Gerber
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# Chapter 5 - Mixing It Up
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var1 = 2
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var2 = '5'
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puts var1 + var2
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# =>...String can't be coerced into Fixnum
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# 5.1 Conversions
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var1 = 2
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var2 = '5'
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puts var1.to_s + var2
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# =>25
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var1 = 2
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var2 = '5'
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puts var1.to_s + var2
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puts var1 + var2.to_i
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# =>25
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# =>7
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puts '15'.to_f # =>15.0
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puts '99.999'.to_f # =>99.999
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puts '99.999'.to_i # =>99
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puts '' # =>
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puts '5 is my favorite number!'.to_i # =>5
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puts 'Who asked you about 5...'.to_i # =>0
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puts 'Your momma did!'.to_f # =>0.0
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puts '' # =>
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puts 'stringy'.to_s # =>stringy
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puts 3.to_i # =>3
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# 5.2 Another Look at puts
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puts 20
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puts 20.to_s
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puts '20'
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# =>20
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# =>20
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# =>20
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# 5.3 The gets Method
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puts gets
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# <=Is there an echo in here?
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# =>Is there an echo in here?
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# 5.4 Did It Work?
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# 5.5 The chomp Method
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puts 'Hello there, and what\'s your name\?'
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name = gets
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puts 'Your name is ' + name + '? What a lovely name!'
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puts 'Pleased to meet you, ' + name + '. :)'
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# =>Hello there, and what's your name?
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# <=Chris
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# =>Your name is Chris
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# =>? What a lovely name!
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# =>Pleased to meet you, Chris
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# =>. :)
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puts 'Hello there, and what\'s your name\?'
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name = gets.chomp
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puts 'Your name is ' + name + '? What a lovely name!'
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puts 'Pleased to meet you, ' + name + '. :)'
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# =>Hello there, and what's your name?
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# <=Chris
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# =>Your name is Chris? What a lovely name!
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# =>Pleased to meet you, Chris. :)
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# 5.7 Mind Your Variables
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my_birth_month = 'August'
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my_birth_day = 3
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puts my_birth_month + my_birth_day
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# =>...no implicit conversion of Fixnum into String

‎pre-course/learn_to_program/05-chapter_6_more_about_methods/00-angry_boss.rb‎

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# Learn to Program - Second Edition
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# Exercise from Chapter 6 - More About Methods
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# Sam Gerber
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# Write an angry boss program that rudely asks what you want.
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# Whatever you answer, the angry boss should yell it back to you and then
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# fire you. For example, if you type in 'I want a raise', it should yell back
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# like this:
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# =>WHADDAYA MEAN "I WANT A RAISE"?!? YOU'RE FIRED!!
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class Boss
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attr_reader :mood
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def initialize(name = 'Pointy-Haired Boss')
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@name = name
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@mood = :angry
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end
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def manage_employee
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puts "What do you want?"
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employee_request = gets.chomp
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if @mood == :angry
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puts "WHADDAYA MEAN \"#{employee_request.upcase}\"?!? YOU'RE FIRED!!"
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end
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end
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end
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Boss.new.manage_employee
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# =>What do you want?
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# <=I would like a raise, sir
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# =>WHADDAYA MEAN "I WOULD LIKE A RAISE, SIR?!? YOU'RE FIRED!!

‎pre-course/learn_to_program/05-chapter_6_more_about_methods/01-Table_of_Contents.rb‎

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# Learn to Program - Second Edition
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# Exercise from Chapter 6 - More About Methods
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# Sam Gerber
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# Here's something for you to do in order to play around
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# more with center, ljust, and rjust: write a program that will display a
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# table of contents so that it looks like this:
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Chapter = Struct.new(:number, :title, :page_number)
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chapters = [Chapter.new(1, "Getting Started", 1),
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Chapter.new(2, "Numbers", 9),
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Chapter.new(3, "Letters", 13)
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]
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line_width = 60
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puts("Table of Contents".center(line_width))
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chapters.each do |chapter|
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puts ("Chapter #{chapter.number.to_s.rjust(2)}: #{chapter.title}").ljust(line_width - 7) + ("page#{chapter.page_number.to_s.rjust(3)}")
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end
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# => Table of Contents
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# =>Chapter 1: Getting Started page 1
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# =>Chapter 2: Numbers page 9
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# =>Chapter 3: Letters page 13

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