Lesson 2.1 completed

add_up.rb

@@ -0,0 +1,18 @@
+# (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(num)
+    sum = num
+    while num > 0
+        # p "Before we substract: #{num}"
+        num = num - 1
+        sum += num
+        # p "After we subtract: #{num}"
+        # p sum
+    end
+    return sum 
+end
+puts add_up(5)
+puts add_up(2)
+puts add_up(6)

full_name.rb

@@ -0,0 +1,16 @@
+    # (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.
+
+full_name = []
+puts "What is your first name:?"
+first_name = gets.chomp
+puts "What is your middle name?"
+middle_name = gets.chomp
+puts "What is your last name?"
+last_name = gets.chomp
+full_name << gets
+
+puts 'Hello ' + first_name + ' ' + middle_name + ' ' + last_name
+
+

leap_year.rb

@@ -0,0 +1,19 @@
+# (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 'Give a starting year'
+start_year = gets.chomp.to_i
+puts 'Give an ending year'
+end_year = gets.chomp.to_i
+puts ''
+
+while start_year.to_i <= end_year.to_i
+	if start_year.to_i % 4 == 0
+		puts start_year
+end
+
+start_year = start_year.to_i + 1
+end

sorted_words.rb

@@ -0,0 +1,13 @@
+# (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. 
+
+sorted_words = []
+puts "Enter random words:\n(Hit enter to exit)"
+while (entry = gets.chomp)
+    break if entry.empty?
+    sorted_words.push entry
+end
+
+puts sorted_words.sort