Bitwise negation operator ~
The ~ (bitwise negation) operator yields the bitwise complement of the operand. In the binary representation of the result, every bit has the opposite value of the same bit in the binary representation of the operand. The operand must have an integral type. The result has the same type as the operand but is not an lvalue.
Suppose x represents the decimal value 5.
The 16-bit binary representation of x is:
0000000000000101The expression ~x yields the following
result (represented here as a 16-bit binary number):
1111111111111010Note that the ~ character can be represented by the trigraph ??-.
The 16-bit binary representation of ~0 is:
1111111111111111
The bitwise negation operator has been extended
to handle complex types. With a complex type, the operator computes
the complex conjugate of the operand by reversing the sign of the
imaginary part. 
