float init 0 request
Basile B.
b2.temp at gmx.com
Tue Aug 25 16:33:01 UTC 2026
On Friday, 14 August 2026 at 06:38:02 UTC, Walter Bright wrote:
> Floats are default initialized to NaN so people will be coerced
> to explicitly code what they want the initialized value to be.
>
> I've seen enough code where the programmer forgot to initialize
> a float, it was defaulted to 0, and the wrong result was not
> detected.
>
> ```d
> float f; // code reviewer: did the programmer intend it to
> be 0?
> float g = 0; // code reviewer: yes, the programmer likely meant
> to initialize it to 0
> ```
>
> It's similar to pointers being default initialized to null.
> Trying to use a null pointer will result in a seg fault.
>
> Most people decry this, but it's actually a great feature. If
> there's a bug in the code, it's better to find it sooner rather
> than after you ship.
I have followed the topic since the beginning and I see something
that's never been noted: an inconsistency is boolean evaluation.
```d
void main()
{
int a;
assert(!a); // ok
float b;
assert(!b); // fails
}
```
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