Data commit

Task/Number-names/Ruby/number-names.rb

@@ -0,0 +1,60 @@
+SMALL = %w(zero one two three four five six seven eight nine ten
+           eleven twelve thirteen fourteen fifteen sixteen seventeen
+           eighteen nineteen)
+
+TENS = %w(wrong wrong twenty thirty forty fifty sixty seventy
+          eighty ninety)
+
+BIG = [nil, "thousand"] +
+      %w( m b tr quadr quint sext sept oct non dec).map{ |p| "#{p}illion" }
+
+def wordify number
+  case
+  when number < 0
+    "negative #{wordify -number}"
+
+  when number < 20
+    SMALL[number]
+
+  when number < 100
+    div, mod = number.divmod(10)
+    TENS[div] + (mod==0 ? "" : "-#{wordify mod}")
+
+  when number < 1000
+    div, mod = number.divmod(100)
+    "#{SMALL[div]} hundred" + (mod==0 ? "" : " and #{wordify mod}")
+
+  else
+    # separate into 3-digit chunks
+    chunks = []
+    div = number
+    while div != 0
+      div, mod = div.divmod(1000)
+      chunks << mod                 # will store smallest to largest
+    end
+
+    raise ArgumentError, "Integer value too large." if chunks.size > BIG.size
+
+    chunks.map{ |c| wordify c }.
+           zip(BIG).    # zip pairs up corresponding elements from the two arrays
+           find_all { |c| c[0] != 'zero' }.
+           map{ |c| c.join ' '}.    # join ["forty", "thousand"]
+           reverse.
+           join(', ').              # join chunks
+           strip
+  end
+end
+
+data = [-1123, 0, 1, 20, 123, 200, 220, 1245, 2000, 2200, 2220, 467889,
+        23_000_467, 23_234_467, 2_235_654_234, 12_123_234_543_543_456,
+        987_654_321_098_765_432_109_876_543_210_987_654,
+        123890812938219038290489327894327894723897432]
+
+data.each do |n|
+  print "#{n}: "
+  begin
+    puts "'#{wordify n}'"
+  rescue => e
+    puts "Error: #{e}"
+  end
+end