what means '-' in microsoft dynamics nav 2009

Question

I am using microsoft dynamics navision 2009 and I see sometimes this sign: '-'

what means '-' in microsoft dynamics navision 2009?

For example this:

 IF FORMAT("Outbound Whse. Handling Time") <> '' THEN BEGIN
    LocTxtHandlTime := '-' + FORMAT("Outbound Whse. Handling Time");
  END ELSE BEGIN
    LocTxtHandlTime := '';
  END;

Thank you

Answer 1

The magic sign '-' is a string - in quotes. For example '' is an empty string and 'Apple' is a string Apple . In programming the quotes are necessary. Read some intro book.