Calculating Negative Binary Numbers

[Saint Nick]

I'm trying to convert 0000 0000 0100 0000 to negative, and I am coming up with 0111 1011 1101 0111 0000. Is that right?

I know you have to take the orignal, flip the bits, then add one, like this:

0000 0000 0100 0000
1111 1111 1011 1111
0000 0000 0000 0001

and i came up with 0111 1011 1101 0111 0000. Could someone double check this for me? I have another one I might have a question on, too.

 

[smack Down]

Clearly that is wrong. You failed at addition
You only add 1 to the flipped bits not the orginal + flipped + 1

 

[spidey07]

do your own homework.

And it depends on the binary system to how you do negative numbers. Without knowing this there is no answer.

 

[mugs]

How did you get from 16 bits to 20 bits?

 

[hypn0tik]

Read

 

[mugs]

Originally posted by: spidey07
do your own homework.

And it depends on the binary system to how you do negative numbers. Without knowing this there is no answer.

Two's complement based on his explanation

 

[MagnusTheBrewer]

Oh, ho, ho, ho. So, I see someone wants help with his machine language homework. Sorry, studying ML has damned you to hell already.

 

[TuxDave]

Original Number
0000 0000 0100 0000

Inverted Number
1111 1111 1011 1111

Plus 1
1111 1111 1100 0000 <-- 2's Complement of Original Number

 

[Kyteland]

1111 1111 1011 1111
0000 0000 0000 0001 +
---------------------------
1111 1111 1100 0000

 

[spidey07]

Originally posted by: mugs

Originally posted by: spidey07
do your own homework.

And it depends on the binary system to how you do negative numbers. Without knowing this there is no answer.

Two's complement based on his explanation

Quiet! I'm trying to make him learn something.

 

[Saint Nick]

Originally posted by: mugs
How did you get from 16 bits to 20 bits?

that 0000 on the end shouldn't be there... dunno why i typed that, actually :/

 

[Saint Nick]

Originally posted by: spidey07

Originally posted by: mugs

Originally posted by: spidey07
do your own homework.

And it depends on the binary system to how you do negative numbers. Without knowing this there is no answer.

Two's complement based on his explanation

Quiet! I'm trying to make him learn something.

Well I obviously am trying to learn here, but I do appreciate a little help every now and then. At least I didn't come in not showing any of my original work and just asking for the answer.

 

[cronic]

The easiest way to remeber 2's complement is to go to the first 1 in the number, keep it, and invert everything after it.

I find it amusing that any question pretaining to class work is frowned upon by some members. Forums have a wealth of knowledge to draw from and should be used for such. good look.

 

[FrustratedUser]

Search for 1-complement and 2-complement binary numbers

 

[TuxDave]

Originally posted by: cronic
The easiest way to remeber 2's complement is to go to the first 1 in the number, keep it, and invert everything after it.

I find it amusing that any question pretaining to class work is frowned upon by some members. Forums have a wealth of knowledge to draw from and should be used for such. good look.

0110 --Invert--> 1001 --Plus 1--> 1010 <-- 2's Complement

Your method:
0110 --> 0101?

Edit: Oh.. unless you're counting 1st from the right...

0110 --> 1010. Interesting.

 

[gsethi]

Originally posted by: pOwder
I'm trying to convert 0000 0000 0100 0000 to negative, and I am coming up with 0111 1011 1101 0111 0000. Is that right?

I know you have to take the orignal, flip the bits, then add one, like this:

0000 0000 0100 0000
1111 1111 1011 1111
0000 0000 0000 0001

and i came up with 0111 1011 1101 0111 0000. Could someone double check this for me? I have another one I might have a question on, too.

Pls Explain on how you got this:

1111 1111 1011 1111
0000 0000 0000 0001 +
--------------------------
0111 1011 1101 0111 0000 =
--------------------------

What kind of "tion" is that ? Definitely not addition and not subtraction or multiplication.

 

[her209]

is this big endian or little endian?