Ruby collections lesson (Lesson 2.1)

add_up.rb

@@ -0,0 +1,17 @@
+#  (3) Write a program with a function add_up(i) .  It is to be passed a positive integer, and it will add all the numbers from 1 to that integer and return the sum.  Call the function three times within the program, and each time print out the return value.  Call the program add_up.rb.
+
+
+def add_up(i)
+    array = (1..i).to_a
+    sum = 0
+    array.each { |a| sum+=a }
+    return sum
+
+end
+
+puts "Enter +Integer to sum"
+upper_boundary = gets.chomp.to_i
+3.times do |i|
+    sum = add_up(upper_boundary)
+    puts sum
+end

full_name.rb

@@ -0,0 +1,28 @@
+# (1) Write a program which asks for a person's first name, then middle, then last.  It should store each of these parts in an array. Finally, it should greet the person using their full name.  Call the program full_name.rb.
+
+person_detail = {"f_name"=>  "", "m_name"=>  "", "l_name"=>  ""}
+
+def get_int
+    input = gets.chomp # this returns a string  
+    input_str = input.to_s # this converts a string to an integer 
+    # puts input_str
+    return input_str
+end
+
+puts "Enter your First Name"
+first_name = get_int
+# print "first name: ", first_name
+person_detail['f_name'] = first_name
+
+puts "Enter your Middle Name"
+middle_name = get_int
+# print "middle name: ", middle_name
+person_detail['m_name'] = middle_name
+
+puts "Enter your Last Name"
+last_name = get_int
+# print "last name: ", last_name
+person_detail['l_name'] = last_name
+
+
+puts "Greetings #{person_detail['f_name']} #{person_detail['m_name']} #{person_detail['l_name']}!"

leap_year.rb

@@ -0,0 +1,15 @@
+#  (4) Write a program, leap_year.rb.  It will ask the user for a starting year and an ending year, and it will then print out all the leap years between them, including the starting or ending year if those are leap years. The rules for leap years are: A leap year is divisible by 4, except for years that are divisible by 100 -- those aren't leap years -- except for years that are divisible by 400, which ARE leap years.
+
+puts "Starting year to find leap year"
+start_year = gets.chomp.to_i
+puts "Ending year to find leap year"
+end_year = gets.chomp.to_i
+
+array = (start_year..end_year).to_a
+array.each do |i|
+  if i % 400 == 0
+  	 puts i.to_s + ' is leap year'
+    elsif i % 4==0 && i % 100 != 0 
+      puts i.to_s + ' is leap year'
+  end
+end

sorted_words.rb

@@ -0,0 +1,34 @@
+# (2) Write a program called sorted_words.rb.  It should prompt the user for words and add each to an array.  The user should be able to add as many words as they like, until they just hit enter to return a blank word. Then sort the array using the sort method and print it out. 
+
+def bubble_sort(array)
+    array_length = array.size
+    return array if array_length <= 1
+
+    loop do
+      # we need to create a variable that will be checked so that we don't run into an infinite loop scenario.
+      swapped = false
+
+      # subtract one because Ruby arrays are zero-index based
+      (array_length-1).times do |i|
+        if array[i] > array[i+1]
+          array[i], array[i+1] = array[i+1], array[i]
+          swapped = true
+        end
+      end
+
+      break if not swapped
+    end
+
+    array
+  end
+
+array = []
+
+loop do
+    puts "Enter words to add each to an array for sorting, Double hit [Enter] to quit"
+    answer = gets.chomp.downcase
+    break if answer == ''
+    array.push(answer)
+end
+
+  p bubble_sort(array)