it's "robison.c" from the 1989 IOCCC https://github.com/c00kiemon5ter/ioccc-obfuscated-c-contest/blob/04a21846149c768e1d856f947ac2527c00cafd96/1989/robison.c h

it's "robison.c" from the 1989 IOCCC https://github.com/c00kiemon5ter/ioccc-obfuscated-c-contest/blob/04a21846149c768e1d856f947ac2527c00cafd96/1989/robison.c https://github.com/c00kiemon5ter/ioccc-obfuscated-c-contest/... https://github.com/c00kiemon5ter/ioccc-obfuscated-c-contest/blob/04a21846149c768e1d856f947ac2527c00cafd96/1989/robison.hint https://github.com/c00kiemon5ter/ioccc-obfuscated-c-contest/... --- This program is a handy picoAPL interpreter written in C--. It outputs the evaluation of an APL expression from standard input. Functions are limited to dyadic +,-,x, and unary -; numerals must be binary. Parentheses may be used for grouping. For example: 101x111-100 prints: 1111