binary math question

[222]

Quote from http://en.wikipedia.org/wiki/Two's_complement

"Note that this is detected as an overflow condition since there was a carry into but not out of the most-significant bit."

Can anyone give an example where there is both a carry in and carry out of the MSB in a single addition of two signed binary numbers? More importantly, why does my example not qualify as a overflow as the article implies? Thank you.

 

[amdhunter]

42

EDIT: I meant 101010

or maybe OVER 10001100101000!!!!

 

[BrokenVisage]

288, depends on the parenthesis, multiplication is implied, etc..

 

[PottedMeat]

wait you want carry in & out?
what?

 1
 11
+11
---
110

oh they're just taking about the range of a signed 8bit number vs. unsigned

 

[222]

bump

 

[222]

bump

 

[222]

bump

 

[222]

bump

 

[FoBoT]

there is no bumping in OT

 

[gophins72]

quote from http://en.wikipedia.org/wiki/two's_complement

"note that this is detected as an overflow condition since there was a carry into but not out of the most-significant bit."

can anyone give an example where there is both a carry in and carry out of the msb in a single addition of two signed binary numbers? more importantly, why does my example not qualify as a overflow as the article implies? Thank you.

   0100          4
+  1100      + (-4)
-------------------
  10000          0
=  0000

Also, the first example in the link you provided has the same example you ask for with explanation, followed by an example of a violation.

 

[222]

^Thanks.