Floating-Point arithmetic in dlang - Difference to other languages

Basile B. b2.temp at gmx.com
Tue Dec 3 12:18:05 UTC 2019


On Tuesday, 3 December 2019 at 09:22:49 UTC, Jan Hönig wrote:
> Today i have stumbled on Hacker News into: 
> https://0.30000000000000004.com/
>
> I am learning D, that's why i have to ask.
>
> Why does
>
>     writefln("%.17f", .1+.2);
>
> not evaluate into: 0.30000000000000004, like C++
> but rather to: 0.29999999999999999
>
> Many other languages evaluate to 0.30000000000000004 as well.

D lang could have a very good sprintf replacement.


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