#define g(x,num) 1/3*(2 * x + (num / x))
#define f(x,num) x*x - num
#define var 1E-12 //(1E-12 = 10^-12)

double x;
int i;
double num;

double srt(double num) {
     x = num;


    for(i; abs(f(x,num)) > var ;i++) {


     x = g(x,num);
      printf ("x: %fn", x);

                        }
    printf ("counter %dn", i);
    return x;
}