NAME
    xor - bitwise exclusive or of a set of integers

SYNOPSIS
    xor(x1, x2, ...)

TYPES
    x1, x2, ...	integer

    return	integer

DESCRIPTION
    Compute the bitwise exclusive or of a set of integers.

    For one argument xor(x1) returns x1.  For two arguments,
    xor(x1,x2) returns the bitwise exclusive or of x1 and x2.
    For each bit pair:

	0 0 xor returns 0
	0 1 xor returns 1
	1 0 xor returns 1
	1 1 xor returns 0

    For more than two arguments, xor(x1,x2,x3, ..., xn) returns:

	xor(...xor(xor(x1,x2), x3), ... xn)

EXAMPLE
    > print xor(2), xor(5, 3, -7, 2, 9)
    2 10

LIMITS
    The number of arguments is not to exceed 100.

LIBRARY
    NUMBER *qxor(NUMBER *x1, NUMBER *x2)

SEE ALSO
    XXX - fill in