C++ Programming - Functions - Discussion

#include<iostream.h>
void Tester(int xx, int yy = 5);
class IndiaBix
{
    int x; 
    int y; 
    public:
    void Tester(int xx, int yy = 5)
    {
        x = xx;
        y = yy;
        cout<< ++x % --y; 
    }
};
int main()
{
    IndiaBix objBix;
    objBix.Tester(5, 5);
    return 0; 
}