I'm sorry if this has been asked and answered before, but I'm not sure I'm even using the correct term when searching for an answer.

How do I get Excel 2013 to understand numbering similar to how software versions are numbered or how IP addresses are numbered; using a period to separate positive integers?

For example, I have several rows of data. In the first row, I want 1.1, second row should be 1.2 etc where the tenth row is 1.10...as in "one dot ten"


Thanks for any assistance!

Eric