doubt

[Aashish]

can anyone tell that why the value of ~0 is -1 and ~4 is -5?
and why right shift is not making any change in (~0)>>1....

[anoop chaurasiya]

let us use 8 bit numbers...

0=(00000000)2
~0=(11111111)2

1=(00000001)2

-1=2's complement of 1=(11111110+1)2=(11111111)2=~0

similarly ~4=-5,

>> is actually the arithmetic right shift operator(means rights shifting shifts the bit pattern to the right and extends the rightmost bit ie. if right most bit is 0, a 0 is produced on the left, if it is 1,a 1 is produced).

i think u need to google a bit to get the notion of 2's complement form and arithmetic right shifting.

On Tue, Mar 15, 2011 at 2:12 PM, Aashish <aashish...@gmail.com> wrote:

can anyone tell that why the value of ~0 is -1 and ~4 is -5?
and why right shift is not making any change in (~0)>>1....

--
Anoop Chaurasiya
CSE (2008-2012)
NIT DGP