"Daniel Gibson" <metalcae...@gmail.com> wrote in message news:ibbp25$ls...@digitalmars.com... > Nick Sabalausky schrieb: >> "so" <s...@so.do> wrote in message news:op.vlv3iukp7dt...@so-pc... >>>> There's no usage of an undeclared variable, but the right-hand-side of >>>> the >>>> second line uses 'i' before *the programmer* initializes it. Yes, the D >>>> compiler chooses to automatically initialize it, but by doing so it >>>> silently >>>> creates a bug every time the programmer intends 'i' to start out as >>>> anything >>>> other than 0. And it's not easily noticed since 0 is a commonly-used >>>> value. >>>> (Something like 0xDEADBEEF would at least be an improvement (albeit a >>>> small >>>> one) since at least that would stand out more and likely fail more >>>> spectacularly.) >>> So you want language force you to type either "int x=0;" or "int >>> x=void;". >>> 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).