Best Abuse of the C Preprocessor: <harvard!xait!pallio!dg> David Goodenough	David Goodenough	anonymous organization	541 Commonwealth Ave,	Newton, MA 02159	USAJudges' comments:    Compile and run.  Try:	echo "to C or not to C" | dg    Some C preprocessors get confused about single quotes in certain cases.    In particular, the following source line:   Cb12(ase(bco(acp(bi(acp(bcp(acp(bpl(aqu(bqu(A))))))))))))))))))))))))))))))    may need to be changed to:   Cb12(ase(bco(acp(bi(acp(bcp(acp(bpl('A'))))))))))))))))))))))))))))    if your C preprocessor botches single quotes in cpp expansions.    Systems that have index() and don't strchr() (e.g., BSD) should    compile with without -Dindex=strchr.Selected notes from the author:    If my preprocessor could hack it, I could write this as one single    line rather than 4, but when I do that I get a complaint "defines    nested too deeply".    Spoiler: (rot13 to read)    Guvf vf nabgure ebg13 wbo (oryvrir vg be abg) - gur #qrsvarf ner n    abiry jnl bs nqqvat gbxraf: '#qrsvar o12(k) 12 k' zrnaf gung ng    fbzr cbvag va gur fbhepr n 12 vf sbyybjrq ol gur pbzcerffrq arfgrq    qrsvarf. Gur o12 trgf gur cerivbhf pbzcerffvba nf na nethzrag, naq    cercraqf gur 12, guhf znxvat nabgure fgrc va gur erperngvba bs gur    fbhepr. Gur nkk() qrsvarf qb gur fnzr, ohg nqq gbxraf nsgre.    Nf sbe gur ebg13 nytbevguz, vg eryvrf ba vaqrk() gb svaq vs gur    punenpgre vf va gur frg N-Mn-m. y[] vf na neenl gung trgf svyyrq    jvgu:    "abcdefghijklmmmmnopqrstuvwxyzzzzABCDEFGHIJKLMMMMNOPQRSTUVWXYZZZZ"    Vs vaqrk() fnlf gur pune vf va gur nycunorg, gura kbe gur bssfrg    jvgu 16 gb genafyngr, naq bhgchg, bgurejvfr cnff vg hapunatrq.