The proper reason why it cannot be LaTeX is that the file starts with typesettable letters (int), and LaTeX doesn't allow typesettable letters before \begin{document}. Actually it is plain TeX.

What has changed since 2005: rot13-encryption of the plain TeX part (so it is no longer obvious which poem it prints), and the long initial string of the C/C++ part is made more compact, especially the #define q line.

In reply to Re^3: Christmas felicitations, 2006 update by Anonymous Monk
in thread Christmas felicitations, 2006 update by Anonymous Monk

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