difference between const/nonconst function that return a pointer

[Assassinbeast]

hello.

Im reading c++ primer+ six edition by stephen prata, im at page 366.

I want to ask what is the difference between these two functions that return a pointer if the definition is the same:

const double* f1(double x);
double* f2(double x);

[vlad from moscow]

The qualifier const means that you may not modify the data refrenced to by the pointer.

[Assassinbeast]

ahh yes, i see... its just kinda confusing sometimes because he used pointers to point to pointerfunctions.

but thanks for help