Treci koren

#include <iostream>
#include <cmath>

using namespace std;

int main()
{
   float c,E = 0.0000001,Xi = 10 ,Xii = 0,dX;

   cout<<"Unesite c:"<<endl;
   cin>>c;

   dX = fabs(Xii-Xi);

   while ( dX > E ) {
        Xii = Xi - ((Xi*Xi*Xi-c)/(3*Xi*Xi));
        dX = fabs(Xii-Xi);
        Xi = Xii;
   }

   cout<<Xii;

    return 0;
}