CGAL users discussion list

[Bernd Gaertner <>]

 wrote:
> Hi,
>
> thank you very very much for your help, it worked perfectly.
>
> However, the double points that I want to check the collinearity are 
> "alleatory" (i.e., I don´t know them in advance). There is any easy way to 
> convert them to a rational type number?

There is an operator>> that reads a decimal floating-point literal such
as "1.4" into a rational number of type CGAL::Gmpq; the conversion is
lossless (see the doc of CGAL::Gmpq). As pointed out by Sylvain, if
you have already read "1.4" into a double value, it's too late to
recover the decimal value 1.4 exactly.

Bernd Gaertner.