lib/models/glimmer/calculator/command/equals.rb in glimmer-cs-calculator-1.0.0 vs lib/models/glimmer/calculator/command/equals.rb in glimmer-cs-calculator-1.0.1

@@ -3,14 +3,14 @@
     class Command
       class Equals < Command
         keywords '=', "\r"
 
         def execute
-          if operation
+          if number1 && number2 && operation
             self.result = operation.calculate.to_s
             self.number1 = self.result
           else
-            self.result = last_result
+            self.result = last_result || '0'
           end
         end
       end
     end
   end