This isn't possible ... octal is only three bits long, and there are 8 bits in a byte. Given a shift and a mask, you can address each bit in a byte using a maximum of one octal number ... maybe that's what you mean? Take care, Sina -----Original Message----- From: programmingblind-bounce@xxxxxxxxxxxxx [mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Dale Leavens Sent: Wednesday, February 20, 2008 4:01 PM To: programmingblind@xxxxxxxxxxxxx Subject: Re: what is Hex? You use two octal numbers, one for the upper and one for the lower nibble of a byte. Frankly I have never really used octal notation for anything serious. There may well be other uses. ----- Original Message ----- From: <yarringt@xxxxxxxxxxxxx> To: <programmingblind@xxxxxxxxxxxxx> Sent: Wednesday, February 20, 2008 1:37 PM Subject: Re: what is Hex? > I'm confused. I get using a hex number to represent the upper and > lower nibble of a byte, but how could you use an octal number to > represent the upper and lower nibble, or a 4-bit register value? > -Debbie > > Dale Leavens wrote: >> Close, >> >> Hex (hexadecimal) is base 16 and it is used because of the >> architecture of computers where a byte is made up of 8 bits. Rather >> than represent the position of 1s and 0s as an 8 bit binary number >> you can represent the contents of the byte with a Hexadecimal number. >> Octal (base 8) was and is sometimes also used to represent the upper >> or lower nibble of a byte or the value of a 4 bit register. >> >> Hope this informs. >> . > > __________ > View the list's information and change your settings at > //www.freelists.org/list/programmingblind > > > > > -- > No virus found in this incoming message. > Checked by AVG Free Edition. Version: 7.5.516 / Virus Database: > 269.20.8/1289 - Release Date: 2/20/2008 10:26 AM > > __________ View the list's information and change your settings at //www.freelists.org/list/programmingblind __________ View the list's information and change your settings at //www.freelists.org/list/programmingblind