overloading a function in a derived class

[afrei]

Assume the following situation:

class A
{
public:
A();
virtual ~A();

virtual void One();
virtual void One(int w);

virtual void Two();
};

class B : public A
{
public:
B();
virtual ~B();

void One(int w);
void Two(int w);
};

The function call:

B obj;
obj.One();
obj.Two();

results in an error:
function does not accept 0 parameter


The compiler doesn't find the appropirate function in the
base class A. Why??? Any ideas?
Just copying the base class functions to the derived class could not be a good solution, coz I had to edit the code of the derived class whenever I add or change a concerning function to the base class.

Many thanks for help.
Andrea

PS: I work with MS Visual C++ 6.0