大写小写问题

app/helpers/exercise_helper.rb

@@ -3,12 +3,11 @@ module ExerciseHelper
 
   # 单选
   def sigle_selection_standard_answer(params)
-    size = params.ord - 64
+    size = params.ord - 96
-    # 输入的为小写字母答案
     if size > 0
       answer = params.ord - 96
     else
-      answer = params.ord
+      answer = params.ord - 64
     end
   end