I'm still trying to learn about computer languages, by targeting 'POSIX bc' to Parrot. Currently I'm checking whether I got the precedences of '+', '-', '*', '/' and '%' right. The harder things are still to come: variables and subroutines.
There is a funny thing I noticed about POSIX bc. POSIX bc has no unary '+', thus '+1' on a line by itself is a syntax error.
bernhard@ubuntu:~$ bc -s bc 1.06 Copyright 1991-1994, 1997, 1998, 2000 Free Software Foundation, Inc. This is free software with ABSOLUTELY NO WARRANTY. For details type `warranty'. 1 1 -1 -1 +1 (standard_in) 3: syntax error 0 0 quit bernhard@ubuntu:~$
