damianesteban

# Write a Ruby program that tells you how many minutes there are in 
# a year (do not bother right now about leap years etc.)

def minutes_in_year
  puts "There are #{365 * 24 * 60} minutes in a year, in case you were curious."
end

minutes_in_year()

damianesteban

# Exercise 5:  The following program prints the value of the variable. Why?

my_string = 'Hello Ruby World' 

 
def my_string
  'Hello World' 
end
 

damianesteban

# Write a method called convert that takes one argument which is a temperature in degrees Fahrenheit. 
# This method should return the temperature in degrees Celsius.
# To format the output to say 2 decimal places, we can use the Kernel's format method. For example, 
# if x = 45.5678 then format("%.2f", x) will return the string 45.57.

def convert_c_f(fahrenheit_degrees)
  celsius = (fahrenheit_degrees.to_f - 32) / 1.8
  printf "#{fahrenheit_degrees} degrees Fahrenheit is %.2f degrees Celsius. ", celsius
end

damianesteban

# Exercise 1
# Write a program that processes the string s = "Welcome to the forum.\nHere you can learn Ruby.\nAlong with other members.\n" 
# a line at a time, using all that we have learned so far. The expected output is:
# >ruby tmp.rb
# Line 1: Welcome to the forum.
# Line 2: Here you can learn Ruby.
# Line 3: Along with other members.
# >Exit code: 0

string_to_slice = "Welcome to the forum.\nHere you can learn Ruby.\nAlong with other members.\n"

damianesteban

# Chapter Two - Class Hierarchies, Attributes and Class Variables
# Inheritance.  How to create a descendent class in Ruby.

# In this example the @name and @description variables are asssigned values in the initialize
# method when a new Thign object is created.
# INSTANCE VARIABLES SHOULD NOT BE ACCESSED DIRECTLY FROM THE "OUTSIDE WORLD" (OOP:  encapsulation)
# SO WHAT DO WE DO?
# To obtain the value of each variable, we need a 'get' accessor method such as get_name AND...
# To asign a new value you need a 'set' accessor method such as set_name
class Thing

damianesteban

x = 10
5.times do |x|
  puts "x inside the block #{x}"
end

puts "x outside the block: #{x}"

damianesteban

def mtdarry
 10.times do |num|
    puts num
  end
end

mtdarry

# output:
# 0

damianesteban

# Exercise3. Write a method leap_year?. It should accept a 
# year value from the user, check whether it's a leap year, and then 
# return true or false. With the help of this leap_year?() method 
# calculate and display the number of minutes in a leap year 
# (2000 and 2004) and the number of minutes in a non-leap year 
# (1900 and 2005). Note: Every year whose number is divisible by four 
# without a remainder is a leap year, excepting the full centuries, which,
# to be leap years, must be divisible by 400 without a remainder. If not 
# so divisible they are common years. 1900, therefore, is not a leap year.

damianesteban

def mtdarry
  10.times do |num|
    square = num * num
    return num, square if num > 5
  end
end

num, square = mtdarry
puts num
puts square

damianesteban

# Here is an interesting example of a method that returns an array:
# if you give return multiple parameters, the method returns them in an array
# The times method of the Integer class iterates block num times,
# passing in values from zero to num -1

def mtdarry
  10.times do |num|
    square = num * num
    return num, square if num > 5
  end