From: Chris <behmc@...>

Date: Tue, 18 Nov 1997 14:38:25 -0500

Date: Tue, 18 Nov 1997 14:38:25 -0500

>>>>Can someone give me the basics of binary addition and subtraction? I think >>>>I understand (and can do) binary addition, but subtraction is giving me >>>>fits. >>>> >>>>Thanks, >>>>*Chris >>> >>>I can give you a DA that I wrote that does it for you...(being a programmer >>>means being inventive). It also means that the battery on the 506L >>>scientific calculator went dead once too often...;-) >>> >>>Mel Patrick - theWabbitGuy - mel@... >>>http://www.intergate.bc.ca/business/mel >> >>Well, I need to know how to do it myself :) I've got a calculater (both on >>the comp and hand held) that will do binary addition/subtraction etc, but >>let's just say I want to know for my own edification. > >Okay, cept the calc I have shows you all the binary numbers. The one you >are adding, the one you are subtracting and what the result it. All at the >same time. You can change any single digit and recalc to see how it affects >the answer. Its a good little learning two tool... specially if you're >doing AND OR NOT and masking... > >Oh, yea, its free too... > >But if you want to know how to do it long hand, its the same as decimal. >Except you can't go over 1. When you borrow, its not 10's, its 1. So : > >10 decimal minus 8 decimal (and yea the answer is two) : > >0000000000001010 - 10 >0000000000001000 - 8 >----------------- >0000000000000010 - 2 > >On the other hand if you wanted to 10 - 12, you'd get an overflow condition >cause you're in the negative portion of the binary world. i.e. there's >nothing to borrow from. Thanks for the help, and now that I know more of what the DA does, yes I'd like that too :) Again, thanks, *Chris --- *Chris behmc@... "I told you I was sick" - Unknown tombstone Expand the Mind at The Quill Society - http://www.quill.net/ Visit my Homepage - http://www.geocities.com/Area51/Vault/3105/ (updated 10/1/97)