cube root in c++

Hello everyone,
I want to achieve this cube root function, my code is as follows:

#include
#include
#include
using namespace std;
class MyMath
{
public:

unsigned long int Square(int target,int k);

unsigned long int Factorial(int n);

double SquareRoot(double n);

double CubeRoot(double n);

};

unsigned long int MyMath::Square(int target,int k)
{
unsigned long int result=1;
for (int i=1;i<=k;i++) result*=target;

return result;
}

unsigned long int MyMath::Factorial(int n)
{
if(n==1) return 1;
else return Factorial(n-1)*n;
}

double MyMath::SquareRoot(double n)
{
return sqrt((double)n);
}

double MyMath::CubeRoot(double n)
{
/*return pow((double)n,3);*/
/*
For example, enter 27 the cube root of the result returned after 3.
*/
}

int main()
{
MyMath mm;
int n;
cout<<"please input a integer number:";

cin>>n;

cout<

//cout<
return 0;
}

Regards

Ken.

Thank you. :)