Ruby

BMI Calculator.rb

#BMIcalculator
puts "Calculate Your Body Mass Index (BMI)"
puts "************************************"
#greetings
puts "What is your name ?"
name = gets.chomp
  if name ==""
    puts  "Hello Stranger!"
  else
    puts "Hello #{name}"
  end

puts "How heavy are you (kg)?"
x = gets.to_f
puts "How tall are you (cm)?"
y = gets.to_f

#bmi calculation
bmi = x/((y/100)*(y/100))

puts "Your BMI is #{bmi}"

if bmi < 18.5
  puts "Underweight"
elsif bmi < 25
  puts "Perfect"
elsif bmi <= 30
  puts "Overweight"
else
  puts "Obese"
end

cat.rb

class Pet
  attr_reader :color, :breed
  attr_accessor :name

  def initialize(color, breed)
    @color = color
    @breed = breed
    @hungry = true
  end

  def feed(food)
    puts "Mmmm, " + food + "!"
    @hungry = false
  end

  def hungry?
    if @hungry
      puts "I'm hungry!"
    else
      puts "I'm full!"
    end
  @hungry
  end
end

class Cat < Pet
  def speak
    puts "Meow!"
  end
end

class Dog < Pet
  def speak
    puts "Woof"
  end
end

#Kitty
kitty = Cat.new("grey", "Persian")
puts "Let's inspect our new cat:"
puts kitty.inspect
puts "What class does our new cat belong to?"
puts kitty.class
puts "Is our new cat object?"
puts kitty.is_a?(Object)
puts "What color is our cat"
puts kitty.color
puts "Let's give our new cat a name"
kitty.name = "Betsy"
puts kitty.name
puts "Is our cat hungry now?"
kitty.hungry?
puts "Let's feed our cat"
kitty.feed("tuna")
puts "Is our cat hungry now?"
kitty.hungry?
puts "Our cat can make noise"
kitty.speak

#Doggy
doggy = Dog.new("black", "Doberman")
puts "Let's inspect our new dog:"
puts doggy.inspect
puts "What class does our new dog belong to?"
puts doggy.class
puts "Is our new dog object?"
puts doggy.is_a?(Object)
puts "What breed is our dog"
puts doggy.breed
puts "Let's name our dog"
doggy.name = "Arnold"
puts doggy.name
puts "Is our dog hungry now?"
doggy.hungry?
puts "Let's feed our dog"
doggy.feed(kitty.name)
puts "Is our dog hungry now?"
doggy.hungry?
puts "Our dog can make noise"
doggy.speak

fav_foods.rb

def fav_foods
  food_array = []
  3.times do
    puts "Name a favorite food."
    food_array << gets.chomp
  end
  p food_array
  puts "Your favorite foods are #{food_array.join(", ")}."
  food_array.each do |food|
    puts "I like #{food} too!"
  end
end

fav_foods

program.rb

def greeting
  puts "Please enter your name:"
  name = gets.chomp
  puts "Hello" + " " + name
end

greeting

program2.rb

if (5 + 5 == 10)
  puts "this is true"
else
  puts "this is false"
end

program3.rb

def choose
  puts "Do you like programing ? Yes, no, or maybe please."
  choise = gets.chomp
  case choise.downcase
  when "yes"
    puts "That\'s great!"
  when "no"
    puts "That\'s too bad!"
  when "maybe"
    puts "Glad you are giving it a chance!"
  else
    puts "I have no idea what that means."
  end
end

choose

program4.rb

number = 0
while (number <= 10) do
  p "the number is now #{number}"
  number +=1
end