C-language bit inversion problem

1 in particular, the decimal number is first converted into binary source code,

Bitwise take the last one plus one, then "press right", get the decimal result,

If the first digit is 1 (refers to the first bit in the original code that is converted to binary), it indicates a negative number so you want to precede the result with a minus sign-.

Example:

int x=20;

printf ("%d\n", ~x);

The result is-21

Solution process:

X=20,
Convert to Binary 00010100
Take anti 11101011 get ~x
Then bitwise take the last one plus one (00010101), then "press right" to get the decimal result,

C-language bit inversion problem