This week's book giveaway is in the OCMJEA forum. We're giving away four copies of OCM Java EE 6 Enterprise Architect Exam Guide and have Paul Allen & Joseph Bambara on-line! See this thread for details.
Where that value comes from is platform-specific, but certainly "dot" is not a particularly useful result. I don't know why it would do that, but if your main concern it just getting a meaningful value, you could try something like this: