bin/maths in maths-0.0.2 vs bin/maths in maths-0.0.3

@@ -30,10 +30,14 @@
     puts
   else
     begin
       result = parser.parse(command)
       
-      if result.frac == 0
+      if result.nil?
+        output = "Undefined"
+      elsif !result.is_a?(Numeric)
+        output = result.to_s
+      elsif result.frac == 0
         output = result.to_i.to_s
       else
         output = result.to_s("F")
       end
       puts "= #{output}"
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