C not operator applied to int? [duplicate]

Answer 1

The not (!) operator returns either 0 or 1, depending on whether the input is non-zero or 0 respectively.

If you are looking for a bitwise negation, try ~x.

Answer 2

The result of expression !x has type bool (in C++) and equal to false if x is not equal to 0 and true otherwise.

In your case !x will be equal to false because x == 5. Then this value (false) is converted to type int in the assignment statement and x becomes equal to 0.

Maybe you meant the operator ~? That is

x = ~x;

I was speaking about C++. In C the value of operator is either 0 or 1 corresponding to false and true in C++ and the result has type int.

Answer 3

! is a logical operator. !expr has value 0 if expr has value non-zero. You need bitwise ~ (NOT) operator.

x = ~x;