null [re: spec#]
a at a.a
Tue Nov 9 10:39:08 PST 2010
"Daniel Gibson" <metalcaedes at gmail.com> wrote in message
news:ibbp25$ls8$1 at digitalmars.com...
> Nick Sabalausky schrieb:
>> "so" <so at so.do> wrote in message news:op.vlv3iukp7dtt59 at so-pc...
>>>> There's no usage of an undeclared variable, but the right-hand-side of
>>>> second line uses 'i' before *the programmer* initializes it. Yes, the D
>>>> compiler chooses to automatically initialize it, but by doing so it
>>>> creates a bug every time the programmer intends 'i' to start out as
>>>> other than 0. And it's not easily noticed since 0 is a commonly-used
>>>> (Something like 0xDEADBEEF would at least be an improvement (albeit a
>>>> one) since at least that would stand out more and likely fail more
>>> So you want language force you to type either "int x=0;" or "int
>>> Fair enough and i agree it "might" be a bit better. But you are making
>>> it as it is something so much important.
>> I tend to get a bit fired up by it because Walter's reasoning on it being
>> *better* to automatically assume some init value baffles me.
> It gives deterministic results/errors.
> For example, when your code works when an int is initialized with 0 (but
> you didn't initialize it), it may work most of the time in C and fail
> randomly. In D it will always work. Same thing the other way round.
> Or if you do some calculation with an uninitialized int value.. I guess 0
> is one of the easiest values to spot: on multiplication it creates 0 and
> on addition it doesn't change to value so by looking at the unwanted
> result of a calculation you probably can see the error more easily than on
> some other value (or even a random value, that may create results that
> look about right).
Where are people getting the idea that I've said C's behavior is better than
D's? Once again, I'm not talking about D vs C (ie "int i;" leaves 'i' in an
undefined state), I'm talking about D vs C# (ie, "int i;" causes
compile-time errors when 'i' is read before being written to).
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