On Tue, 2013-01-01 at 11:41 -0700, Joe Pfeiffer wrote:
> Looking into it a bit more, I can't find a place where the C99 standard
> requires *any* warnings. In particular:
>
> Annex I
> (informative)
> Common warnings
> 1 An implementation may generate warnings in many situations, none of which
> are
> specified as part of this International Standard. The following are a few
> of the more
> common situations.
>
> (a list of warnings follows)
>
> A search doesn't turn up the string "warn" anywhere in the standard
> except in this annex.
But it probably has quite a few occurrences of 'diagnostic', the C++
standard does; and it states that a 'diagnostic message' shall be issued
if a program breaks the rules of the language except where the standard
explicitly states no diagnostic is required.
With regard to the original question of assigning a negative value to an
unsigned integer, this seems to be allowed and defined behaviour. The
section on integral conversions has:
If the destination type is unsigned, the resulting value is the
least unsigned integer congruent to the source integer (modulo 2
n where n is the number of bits used to represent the unsigned
type). [Note: In a two’s complement representation, this
conversion is conceptual and there is no change in the bit
pattern (if there is no truncation). ]
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Tixy
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