Bitwise NOT operation tool

!" (Logical NOT) is a logical operator. "Logical NOT" refers to the inverse of the original value. For example, "!!0" evaluates to 1 (the number being tested is 0, which is true, so the expression's value is 1). "!!1" evaluates to 0 (the number being tested is non-zero, which is false, so the expression's value is 0).