«

xz wrote:
>> Given:
>> #include <cmath>
>> const double eps = 0.0001; // your treshold
>> double d = 10.00005; // your number
>>
>> The algorithm would be:
>> 1. Round d to nearest integer.
>> 2. Check if nearest integer is within treshold.
>>
>> double near = std::floor(d+0.5);
>> if (std::abs(d - near) < eps) {
>
> I guess you meant fabs(...), right?

No. std::abs is overloaded for built-in types. fabs() has the signature:
double fabs(double);

So in this case you can use both.

--
Thomas

On Apr 23, 9:59*pm, "Thomas J. Gritzan" <phygon_antis...@gmx.de>
wrote:
> xz wrote:
> >> Given:
> >> #include <cmath>
> >> const double eps = 0.0001; // your treshold
> >> double d = 10.00005; // your number
>
> >> The algorithm would be:
> >> * *1. Round d to nearest integer.
> >> * *2. Check if nearest integer is within treshold.
>
> >> double near = std::floor(d+0.5);
> >> if (std::abs(d - near) < eps) {
>
> > I guess you meant fabs(...), right?
>
> No. std::abs is overloaded for built-in types. fabs() has the signature:
> * *double fabs(double);
>
> So in this case you can use both.

Thanks!

>
> --
> Thomas