i have the number in eax

when i neg eax

say eax was 1,
it gives me 15

anyone know what to do?

so you have a 4 bit register

0001

two's complement negative of that is

1111

which is 15.


you could start by asking better questions.

This post was edited by irimi on Sep 18 2012 12:00pm

his question seems to be: "why don't i get '-1' on my screen?"
as Irimi said, its because you interpret the '-1' to be 15.

i understand how 2's complement works
but its a signed bit
1111 should read -1

registers don't really care about signs. as long as you have the bits correct, it's correct.

how the value in a register is interpreted depends on the program that's reading it.

This post was edited by irimi on Sep 18 2012 04:33pm

i emailed my profesor.

it probabably something stupid.

lolled