wrong rounding

[John Colvin via Digitalmars-d]

On Monday, 1 June 2015 at 21:44:57 UTC, Steven Schveighoffer 
wrote:
> On 6/1/15 5:29 PM, Oleg B wrote:
>> Hello. I found unexpected (for me) behavior of rounding double 
>> values at
>> casting to ulong:
>>
>> $ cat roundtest.d
>> import std.stdio;
>>
>> void main()
>> {
>>     double a = 10, b = 0.01;
>>
>>     writeln( "int:   ", cast(int)(a/b) );
>>     writeln( "uint:  ", cast(uint)(a/b) );
>>     writeln( "long:  ", cast(long)(a/b) );
>>     writeln( "ulong: ", cast(ulong)(a/b) );
>> }
>>
>> $ rdmd roundtest.d
>> int:   1000
>> uint:  1000
>> long:  1000
>> ulong: 999   <----- WTF?? -------
>
> These are NOT roundings. They are truncations.
>
> Note that for floating point 0.01 is not representable exactly. 
> This is the reason you get the error. On other systems, you may 
> not get errors for this one case, but you could get errors for 
> other. Please read about floating point error: 
> http://en.wikipedia.org/wiki/Floating_point#Accuracy_problems
>
> -Steve

Nonetheless, surely in this case the values should be the same 
regardless of the integer target type, no?