address issue 24: floating point spelling

num2words/base.py

@@ -116,16 +116,15 @@ class Num2Word_Base(object):
 
         pre = int(value)
         post = abs(value - pre)
+        post *= 10**self.precision
 
         out = [self.to_cardinal(pre)]
         if self.precision:
             out.append(self.title(self.pointword))
 
         for i in range(self.precision):
-            post *= 10
-            curr = int(post)
-            out.append(str(self.to_cardinal(curr)))
-            post -= curr
+            curr = str(post)[i]
+            out.append(str(self.to_cardinal(int(curr))))
 
         return " ".join(out)
 

tests/test_en.py

@@ -21,3 +21,10 @@ class Num2WordsENTest(TestCase):
     def test_and_join_199(self):
         # ref https://github.com/savoirfairelinux/num2words/issues/8
         self.assertEqual(num2words(199), "one hundred and ninety-nine")
+
+    def test_cardinal_for_float_number(self):
+        # issue 24
+        self.assertEqual(num2words(12.50), "twelve point five zero")
+        self.assertEqual(num2words(12.51), "twelve point five one")
+        self.assertEqual(num2words(12.53), "twelve point five three")
+        self.assertEqual(num2words(12.59), "twelve point five nine")