Die original idea was to replace the "x" with the right year. Since 2009 (C++09) didn't happen, it is C++11 now. Geeky would be hex: C++0B

If you wanted to write a year in hex, using the value mod 100 seems a weird way to do it. The hex year is 0x07DB, so if anything it would be C++DB. Or perhaps the first 3-4 hex digits of the Unix time would make sense - C++4E46.

0B is an invalid octal literal, to get a hex literal you'd just append B, yielding C++0xB ;)

Octal 013 would be more appropriate.