Whatapalaver solutions

ch09-writing-your-own-methods/ask.rb

@@ -1,3 +1,9 @@
 def ask question
-  # your code here
-end
+  while true
+    puts question
+    reply = gets.chomp.downcase
+    return true if reply == 'yes'
+    return false if reply == 'no'
+    puts 'Answer yes or no'
+  end
+end

ch09-writing-your-own-methods/old_school_roman_numerals.rb

@@ -1,3 +1,13 @@
 def old_roman_numeral num
-  # your code here
-end
+
+  roman_array = []
+  roman_array << 'M' * (num / 1000)
+  roman_array << 'D' * (num % 1000 / 500)
+  roman_array << 'C' * (num % 500 / 100)
+  roman_array << 'L' * (num % 100 / 50)
+  roman_array << 'X' * (num % 50 / 10)
+  roman_array << 'V' * (num % 10 / 5)
+  roman_array << 'I' * (num % 5 / 1)
+  return roman_array.join
+
+end

ch09-writing-your-own-methods/roman_numerals.rb

@@ -1,3 +1,26 @@
 def roman_numeral num
-  # your code here
-end
+  values = [
+    [1000, 'M'],
+    [900, 'CM'],
+    [500, 'D'],
+    [400, 'CD'],
+    [100, 'C'],
+    [50, 'L'],
+    [40, 'XL'],
+    [10, 'X'],
+    [9, 'IX'],
+    [5, 'V'],
+    [4, 'IV'],
+    [1, 'I']
+  ]
+  new_roman_array = ""
+
+  values.each do |number, roman|
+    while num >= number
+      new_roman_array << roman
+      num -= number
+    end
+  end
+
+  new_roman_array
+end