Vocabulary
kernel

Inputs and outputs

obj1	a generalized boolean
obj2	a generalized boolean
?	a generalized boolean

Word description
If exactly one input is false, outputs the other input. Otherwise outputs f.

Notes
This word implements boolean exclusive or, so applying it to integers will not yield useful results (all integers have a true value). Bitwise exclusive or is the bitxor word.

Definition

IN: kernel

: xor ( obj1 obj2 -- ? ) [ f swap ? ] when* ; inline