Why does printf("%d", ~0) output -1? [duplicate]

Question

Why does printf("%d", ~0); yield a value of -1? Shouldn't it be 1 since the ~ operator converts each 1-bit into a 0-bit and vice versa?

From what I understand is 0000 will be negated to 1111.

Answer 1

~ is a bitwise complement operator . 00000000 is flipped to 11111111.

If you take 2'scomplement of 1(00000001) what you get is 11111111 which is to represent -1 in binary.

Therefore the output is -1.