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Winter 97 Question #2
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Marek Krzeminski
Feb 22, 1998, 3:00:00 AM2/22/98
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Why is it that when you add 11001 to 11011 you get
-12 and not 20 ??
K Bains
Feb 22, 1998, 3:00:00 AM2/22/98
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In article <EorKF...@watserv3.uwaterloo.ca>, "Marek Krzeminski" <mmak...@novice.uwaterloo.ca> wrote:
>Why is it that when you add 11001 to 11011 you get
>-12 and not 20 ??
>
May I ??
It seems that you are adding singed 2's complement If that is the case then
you must:
1) Add the two binary numbers (11001 is -7 and 11011 is -5).
2) Ignore the carry (in this case being the 6th bit in the result).
3) If the result is negative, then you must convert to a signed decimal
notation.
-7 + (-5) = -12
11001 + 11011 = 110100
/\
Ignore the bit!
Jim Field
Feb 23, 1998, 3:00:00 AM2/23/98
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In article <EorKF...@watserv3.uwaterloo.ca>,
Marek Krzeminski <mmak...@novice.uwaterloo.ca> wrote:
>Why is it that when you add 11001 to 11011 you get
>-12 and not 20 ??
>
After that the numbers "wrap around". See the picture on page 21
of the notes.
J Field
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