one's complement

[Paul]

basically i have these two numbers in binary:

11010111 and 10001000

i did this: 11010111 - 10001000 and got: 01001111

now i need to CONVERT 10001000 to one's complement and repeat the 'subtraction' by doing one's-comp addition.

how do i do that?! i think converting 10001000 will give me 01110111 but after that i'm stumped. i also need to perform a side-check in nine's complement.

i need the answer within 2 hours of this post....

[Paul]

dammit. i just searched google again but this time i said "one's complement subtraction" instead of addition. i found this: http://courses.cs.vt.edu/~csonline/Numb ... omplement/ and its all sorted out!

now i gotta do the nine's comp check.

[refractor]

Nine's complement is the same technique but you just perform it on decimal instead of binary.

[Paul]

http://mathforum.org/library/drmath/view/55949.html

tada. coursework done. now i gotta print and hand in before 4. then i have to do systematic programming cwk for friday, write my presentation for the oral exam and revise everything for exams next week.

[refractor]

My girlfriend has third-year pharmacology exams next week, too. Good luck in the exams

[Paul]

bah, never wish someone good luck in exams. its like a jinx. besides, i shouldnt need luck, if i've revised properly but i havent, so uh... crap.

at least my tarantino box set arrived yesterday.... at my house... miles away. pfft.

[BurningSheep]

Ah everyone making exams... except for the lucky bastards who had an exam period just before their vacation instead of immediately after :\

I have an exam on the theory of computation this friday. Number representations is a part of it aswell, albeit a very small part since every representation with a base higher than 1 is considered in the same class (because there's a constant factor between a number in one base and any other, bla bla bla). I'm so gonna fail it =[ hmm, what am i doing here... better go back to studying!