||Bitwise exclusive or operator
exclusive-or-expr := exclusive-or-expr ^ and-expr | exclusive-or-expr xor and-expr
The bitwise exclusive or operator requires
integer or enumeration operands. It performs the usual arithmetic
conversions, then does an exclusive or operation
on pairs of bits in the operands, resulting in an integer.
The xor operator is interchangeable with the
unsigned bitmask = 0xFFF0;
bitmask = bitmask ^ 0x0F12; // bitmask becomes 0xF0E2.
expression, xor_eq, Chapter 3, <ciso646>