# right and left shifts for -ve numbers

Ranch Hand
Posts: 86
Hi,
I know this is a lame question but I had lot of doubts in it.
Can any body explain taking a -ve number convert it to binary form and show the << and >> shifts of it.
Thanks in bunches,

Mukti Bajaj
Ranch Hand
Posts: 59
Hi,
http://www.hal-pc.org/%7Eclyndes/computer-arithmetic.html#COMPUTER-TWOS
The explanation given is very easy and will help you to clear you doubts.
HTPs
Mukti

Ranch Hand
Posts: 86
Hi mukthi,
Thankyou very much for the site . It is very explanative and very clear.Thankyou once again.

Ranch Hand
Posts: 86
Hi,
I got the site and understood fairly how to represent a negative number in binary form and left and right shift of postive numbers.
For example -13 binary is 1111 0011 and -13 >> 3 = 1111 1110.
I don't know how to interprete this as decimal number. Can anybody explain please?

Jane Griscti
Ranch Hand
Posts: 3141
Here's a link to some notes I have posted on Binary/Octal/Decimal/Hex converstions.
Hope they help.
------------------
Jane Griscti
Sun Certified Java 2 Programmer
[This message has been edited by Jane Griscti (edited February 12, 2001).]

Ranch Hand
Posts: 86
Hi Jane,
The site given by you is so good but I still have the doubt for -13>>3 1111 1110 which is equal to -2. Even in your sight there is anumber -16>>2 which is equal to -4. The only part I did not understood is the calc part to arrive at -2 from
1111 1110 or in the -16 example. Please try to explain.

Maja Grabovac
Greenhorn
Posts: 16
The way to find out the value of that number is -i = (~i)+1 which means in your case:
~1111 1110 +1 = 0000 0001(bin)+1(bin) = 0000 0010(bin) = 2 (dec)
Therefore the value is -2
If you want to present -i = (~i)+1
16(dec) = 0001 0000
~16 = 1110 1111
~16+1 = 1111 0000