@                        Bitwise Exclusive OR operator (XOR)

 exp1 @ exp2            Bitwise exclusive OR
 exp1, exp2              any integral expression

    The @ operator performs a  bit-by-bit exclusive OR (aka XOR)  operation
    on exp1 and exp2.  (In an exclusive OR, a bit of the result is true  if
    either one  of the  corresponding bits  of exp1  or exp2  is true;  the
    result is false if  both corresponding bits are  true or both bits  are
    false.)  Example:

           i = 4080;            # i == 0x0FF0 == 0000111111110000 (base 2)
           j = 65280;           # j == 0xFF00 == 1111111100000000 (base 2)
           k = i @ k;           # k == 0xF0F0 == 1111000011110000 (base 2)