Overflow of byte

[Robert Ziel]

hi,
can someone explain to me when a byte flows over
it turns negative .. ???
thanks,
Robert

[Dirk Schreckmann]

Robert,
A byte is an 8 bit integer data type. The possible range of the value of a byte is -128 to 127. Let's consider adding one to the bit representation of the maximum value of 127:

  0 1 1 1  1 1 1 1  --   127
+ 0 0 0 0  0 0 0 1  --     1
------------------
  1 1 1 1  1 1 1 0  --  -128

Now, mosey on over to The JavaRanch Campfire and learn all about Cat and Mouse Games with Bits!
Good Luck.

[Corey McGlone]

Dirk, it looks like your binary addition could use a little help.

  01111111  |   127
+ 00000001  |  +  1
----------- | ------
  10000000  |  -128

Just wanted to clear that up.
Corey

[Dirk Schreckmann]

Hey, it was early in the morning. You should have seen the first draft - it was worse.
Thanks Corey.

[Robert Ziel]

Thanks guys,
this clears it up...
Robert