Adding a positive number and a negative number

Steve Holden steve at
Sat Jan 31 01:35:40 CET 2009

Scott David Daniels wrote:
> Grant Edwards wrote:
>> On 2009-01-30, MRAB <google at> wrote:
>>> Eric Kang wrote:
>>>> In two's complement representation, can adding one positive
>>>> and one negative give you overflow?
>>> No.
>> AFAIK, in Python adding integers never gives you overlow
>> regardless of sign.
> Right, but he wants his homework answer.

And Python doesn't use pure two's complement notation when it promotes
regular integers to longs.

Steve Holden        +1 571 484 6266   +1 800 494 3119
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