Didn't see anyone mentioned these two pearls: C (K&R) program that calculates PI number by measuring circle that is its code: https://en.wikipedia.org/wiki/Int

Didn't see anyone mentioned these two pearls: C (K&R) program that calculates PI number by measuring circle that is its code: https://en.wikipedia.org/wiki/International_Obfuscated_C_Code_Contest#Pi https://en.wikipedia.org/wiki/International_Obfuscated_C_Cod... Perl one-liner that checks if a number is prime: perl -lne '(1x$_) =~ /^1?$|^(11+?)\1+$/ || print "$_ is prime"'