diff --git a/input_resolver.cpp b/input_resolver.cpp
index c35320c..b95e481 100644
--- a/input_resolver.cpp
+++ b/input_resolver.cpp
@@ -80,6 +80,10 @@ Command resolveCommand()
         {
             operation = c;
         }
+        else
+        {
+            operation = '+';
+        }
     }
 
     return {shouldQuit, operation, validation_result.next_arg(), shouldPrint};