Performs a bitwise NOT (negation) on an expression.
result = ~ expression
All unary operators, such as the ~ operator, evaluate expressions as follows:
The operator is applied to the resulting number.
The ~ operator looks at the binary representation of the values of the expression and does a bitwise negation operation on it. The result of this operation behaves as follows:
0101 (expression) ---- 1010 (result)
Any digit that is a 1 in the expression becomes a 0 in the result. Any digit that is a 0 in the expression becomes a 1 in the result.