create and initialise array

[mw]

On Thursday, 20 June 2019 at 07:57:25 UTC, KnightMare wrote:
> On Thursday, 20 June 2019 at 01:32:04 UTC, matheus wrote:
>>>
>> import std.stdio;
>> import std.array;
>>
>> void main(){
>>     auto s = uninitializedArray!(float[])(100);
>>     s[] = 0.0f;
>>     writeln(s[0]);
>> }

Even with this, user has to write two statement, why we can't 
just have:

   auto s = new float[100](0);


> another version:
> auto arr = new double[ 10 ];
> writeln( arr[5] ); // NaN
> arr.length += 10;
> writeln( arr[15] ); // NaN
>
> imo NaN is useless, weird and unusual coz integrals and 
> pointers are "all bits zeroes" but float and chars are "all 
> bits ones". WTF? its strange that bool.init is false in such 
> case.
> .init = "all zeroes" can be faster initialize any block of 
> memory.


I have the same question, why float/double are init to NaN, 
instead of 0? as other post-C++ language does? e.g Java, C# ...

What's the reason for this design decision?