What am I doing wrong here - canFind with iota is not working

[John Colvin via Digitalmars-d]

On Thursday, 26 February 2015 at 10:55:43 UTC, Kingsley wrote:
> float oneDegree = (PI / 180.0);
> float first = -(oneDegree * 10.0);
> float second = (oneDegree * 10.0);
> float step = 0.000001;
> float[] r = iota(first,second,step).array;
>
> writeln(r);
>
> float item = 0.174531;
> writeln(r.canFind(item));
>
>
> // returns false for canFind - even though that float is in the 
> array ???

Never check floating point numbers for equality, unless you've 
really thought about how the floating point arithmetic for this 
specific problem will go. Pretty much the only place it's useful 
to do is in unit tests for maths libraries.