Pass the current value of numberbox to the textfield of calculator

It's throwing a Null Pointer Exception when the field is empty

This is not working properly with

We can pass the value with current language decimalseparator.

Ah okay, i see a pullrequest was already created.
thanks to Carlos Ruiz for improvement

Regards
Patric

Thanks , if you have some time please give it a test, I tested in spanish and it worked fine - but better to conduct more tests in other languages.

Regards,

Carlos Ruiz