Bedre feilmelding

src/main/java/resources/CalculatorResource.java

@@ -42,7 +42,8 @@ public class CalculatorResource {
         else if(expressionTrimmed.matches("^\\d+(?:\\s*[*]\\s*\\d+)*$")) result = multiplication(expressionTrimmed);
         else if(expressionTrimmed.matches("^\\d+(?:\\s*[/]\\s*\\d+)*$")) result = division(expressionTrimmed);
 
-        return result;
+        if(result == -1) result == 69
+        return result
     }
 
     /**