I've got compilation error and I think it's because of including
math.h. Can you advise me something?

> I've got compilation error and I think it's because of including
> math.h. Can you advise me something?
I think your problem shouldn't be including <math.h>

as I quest , it might be this

int a;
double b;
....
b=sqrt(a); //compilation error here

because the parameter pass to sqrt is int , and sqrt in library here has
been overloaded for more than one argument type , but not for int. so
the compiler don't know which one to pick

it can be fix just by casting
int a;
double b;
....
b=sqrt((double)a); // can be compiled now

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anyway if you really can't include <math.h> , implement you own sqrt
(one method is using numerical method)