C++ Programming - Functions

#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; 
}

#include<iostream.h> 
class PowerFinder
{
    public:
    void Power(int x = 1, int y = 1)
    {
        int P = 1, i = 1;
        while(++i <= y)
        {
            P *= x;
        }
        cout<< P << endl; 
    } 
};
int main()
{
    PowerFinder FP; 
    FP.Power(2, 6); 
    return 0;
}

#include<iostream.h>
void Tester(float xx, float yy = 5.0);
class IndiaBix
{
    float x; 
    float y; 
    public:
    void Tester(float xx, float yy = 5.0)
    {
        x = xx;
        y = yy;
        cout<< ++x % --y; 
    }
};
int main()
{
    IndiaBix objBix;
    objBix.Tester(5.0, 5.0);
    return 0; 
}

#include<iostream.h>
const double BixConstant(const int, const int = 0);
int main()
{
    const int c = 2 ;
    cout<< BixConstant(c, 10)<< " "; 
    cout<< BixConstant(c, 20)<< endl; 
    return 0;
}
const double BixConstant(const int x, const int y)
{
    return( (y + (y * x) * x % y) * 0.2);
}

#include<iostream.h> 
struct MyStructure
{
    class MyClass
    {
        public:
        void Display(int x, float y = 97.50, char ch = 'a')
        {
            cout<< x << " " << y << " " << ch;
        }
    }Cls; 
}Struc;
 
int main()
{
    Struc.Cls.Display(12, 'b');
    return 0; 
}