"Missing number, treated as zero." in LaTex [closed]

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I want to get the Roman number开发者_Python百科 of 2. So I use $\Roman{2}$ inside text. But then I got an error

Missing number, treated as zero.

How can I fix it?

Thanks and regards!

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I would suggest to use that snippet:

\makeatletter
\newcommand{\rmnum}[1]{\romannumeral #1}
\newcommand{\Rmnum}[1]{\expandafter\@slowromancap\romannumeral #1@}
\makeatother

now you can call:

\Rmnum{2} % II
\rmnum{2} % ii

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I think you mean \Roman not \Rome. Anyway, \Roman prints the value of a counter as a roman numeral, so you can't use it with "2".

Short answer - use \romannumeral 2.

Long answer - define commands as described here.