Nicholas Nethercote wrote:
Hi,
There was recently a very long thread about the overflow behaviour of
signed integers in C. Apparently this is undefined according to the C
standard. I searched the standard on this matter, and while I did find
some paragraphs that described how unsigned integers must wrap around
upon overflow, I couldn't find anything explicit about signed integers.
Can someone point me to the relevant part(s) of the standard?
c99 6.5 para 5 (overflow is undefined) & 6.3.1.3 (conversions to unsigned type
obey modulo laws)
c++ 5 para 5 (overflow is undefined, unless otherwise stated) & 3.9.1 para 4
(unsigned types obey modulo laws)
I cannot find, in c99, a statement that all unsigned arithmetic obeys modulo
laws -- only that integral conversions to them do.
nathan
--
Nathan Sidwell :: http://www.codesourcery.com :: CodeSourcery LLC
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