EBNF to C++

[FlashDrive]

Hello out there,

I'd like to know how I could get best from EBNF
number=[-]{cypherNotZero}cypher
to C++. I would be very glad if someone could answer this question. =)

FlashDrive

At the moment, I'm programming an AI in german and I got the german language into an EBNF form ( see http://en.wikipedia.org/wiki/EBNF ), but I want to PROGRAM it. ^^