How to export a C++ class from a dll?

I have a class which has two overloaded functions. How do I export it from a dll and also how to use it by other C++ classes? My class looks like this:

#define DECLDIREXP __declspec(dllexport) 

#define DECLDIRIMP __declspec(dllimport)


class DECLDIREXP xyz 

{

public: 
          void printing();
          void printing(int a);
};  

using namespace std; 

void xyz::printing()
{
        cout<<"hello i donot take any argument";
}


void xyz::printing(int a)
{
        cout<<"hello i take "<< a <<"as argument";
}