There is no problem with the compiler distinguishing these two function definitions:
void func(double x){/*…*/}
int func(double x){/*…*/ return something_double;}

Question

Quizplus · Accepted Answer

The compiler cannot distinguish between these two function definitions since they have the same parameter type and return type. This will result in a redefinition error or compilation error.

There Is No Problem with the Compiler Distinguishing These Two