Addition [of integers]

description:: This is one of the most well-known Forth one-liners. In the short form, it looks like following: : + BEGIN DUP WHILE 2DUP AND 2* >R XOR R> REPEAT DROP ;
explanation:: > From: Wil Baden <neilbawd@earthlink.net> : + ( x y -- x+y ) BEGIN DUP WHILE 2DUP AND 2* \ Calculate bit carries. >R XOR R> \ Calculate bit sums. REPEAT DROP ;