What will happen if a class is not having any name?

#include<iostream.h> 
class CuriousTab
{
    int x; 
    public:
    CuriousTab(short ss)
    {
        cout<< "Short" << endl;
    }
    CuriousTab(int xx)
    {
        cout<< "Int" << endl;
    }
    CuriousTab(char ch)
    {
        cout<< "Char" << endl;
    }
    ~CuriousTab() 
    {
        cout<< "Final";
    }
};
int main()
{
    CuriousTab *ptr = new CuriousTab('B');
    return 0; 
}

#include<iostream.h> 
class CuriousTab
{
    int x, y; 
    public:
    CuriousTab(int xx = 0, int yy = 0)
    {
        x = xx; 
        y = yy;
    }
    void Display()
    {
        cout<< x << " " << y;
    }
    CuriousTab operator +(CuriousTab z)
    {
        CuriousTab objTemp;
        objTemp.x = x + z.x;
        objTemp.y = y + z.y;
        return objTemp; 
    }
};
int main()
{
    CuriousTab objCuriousTab1(90, 80); 
    CuriousTab objCuriousTab2(10, 20); 
    CuriousTab objSum; 
    CuriousTab &objRef = objSum; 
    objRef = objCuriousTab1 + objCuriousTab2; 
    objRef.Display(); 
    return 0; 
}

#include<iostream.h> 
class CuriousTabBase
{
    protected:
    int x, y; 
    public:
    CuriousTabBase(int xx = 0, int yy = 0)
    {
        x = xx;
        y = yy; 
    } 
    void Show()
    {
        cout<< x * this->y << endl;
    }
};
class CuriousTabDerived
{
    private:
        CuriousTabBase objBase; 
    public:
    CuriousTabDerived(int xx, int yy) : objBase(xx, yy)
    {
        objBase.Show();
    } 
    ~CuriousTabDerived()
    { }
};
int main()
{
    CuriousTabDerived objDev(10, 20); 
    return 0;
}

#include<iostream.h> 
class Number
{
    int Num; 
    public:
    Number(int x = 0)
    {
        Num = x;
    }
    void Display(void)
    {
        cout<< Num;
    }
    void Modify(); 
};
void Number::Modify()
{
    int Dec;
    Dec = Num % 13; 
    Num = Num / 13; 
    
         if(Num  > 0 ) Modify()   ; 
         if(Dec == 10) cout<< "A" ; 
    else if(Dec == 11) cout<< "B" ; 
    else if(Dec == 12) cout<< "C" ; 
    else if(Dec == 13) cout<< "D" ;
    else               cout<< Dec ;
}
int main()
{
    Number objNum(130);
    objNum.Modify();
    return 0; 
}

#include<iostream.h> 
class CuriousTab
{
    int x, y; 
    public:
    CuriousTab(int &xx, int &yy)
    {
        x = xx;
        y = yy;
        Display();
    }
    void Display()
    {
        cout<< x << " " << y;
    }
};
int main()
{
    int x1 = 10; 
    int &p = x1;
    int y1 = 20; 
    int &q = y1; 
    CuriousTab objCuriousTab(p, q); 
    return 0; 
}