Equality and complement operator

Question

Why x = 0 ?? Here 👇👇
Or how is the complement of 0 gives -1 ???

https://code.sololearn.com/clyjS6Sy2UNC/?ref=app

Answer 1

Well in C for any integer n, bitwise complement of n will be -(n+1). To understand this, you should have the knowledge of 2's complement.
It works like this
First it converts the given decimal number to its corresponding binary value.That is in case of 0 it converts it to 0000 0000 (to 8 bit binary number).
Then it converts it to the ones complement , 1111 1111
that is the 2's complement representation of -1
So -1 == ~0 outputs 1(true)
x = 1 - 1

Answer 2

i got it thanks 🌺