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

#include<iostream.h> 
class Base
{
    public:
    int S, A, M; 
    Base(int x, int y)
    {
        S = y - y;
        A = x + x; 
        M = x * x;
    }
    Base(int, int y = 'A', int z = 'B')
    {
        S = y;
        A = y + 1 - 1; 
        M = z - 1;
    }
    void Display(void)
    {
        cout<< S << " " << A << " " << M << endl;
    }
};
class Derived : public Base
{
    int x, y, z; 
    public:
    Derived(int xx = 65, int yy = 66, int zz = 67): Base(x)
    {
        x = xx; 
        y = yy;
        z = zz;
    }
    void Display(int n)
    {
        if(n)
            Base::Display(); 
        else
            cout<< x << " " << y << " " << z << endl; 
    }
};
int main()
{
    Derived objDev; 
    objDev.Display(-1); 
    return 0;
}

#include<iostream.h>
int CuriousTabFunction(int a, int b = 3, int c = 3)
{
    cout<< ++a * ++b * --c ; 
    return 0;
}
int main()
{
    CuriousTabFunction(5, 0, 0); 
    return 0;
}

#include<iostream.h> 
class CuriousTab
{
    int x; 
    float y; 
    public:
    void Function()
    {
        x = 4; 
        y = 2.50; delete this;
    }
    void Display()
    {
        cout<< x << " " << y;
    } 
}; 
int main()
{
    CuriousTab *pCuriousTab = new CuriousTab();
    pCuriousTab->Function(); 
    pCuriousTab->Function(); 
    pCuriousTab->Display(); 
    return 0; 
}

#include<iostream.h>
#include<string.h> 
class CuriousTab
{
    char str[50]; 
    char tmp[50]; 
    public:
    CuriousTab(char *s)
    {
        strcpy(str, s);
    }
    int CuriousTabFunction()
    {
        int i = 0, j = 0; 
        while(*(str + i))
        {
            if(*(str + i++) == ' ')
                *(tmp + j++) = *(str + i);
        }
        *(tmp + j) = 0; 
        return strlen(tmp); 
    }
};
int main()
{
    char txt[] = "Welcome to CuriousTab.com!";
    CuriousTab objCuriousTab(txt); 
    cout<< objCuriousTab.CuriousTabFunction();
    return 0;
}

#include<iostream.h>
#include<string.h> 
class CuriousTab
{
    char txtMsg[50]; 
    public:
    CuriousTab(char *str = NULL)
    {
    if(str != NULL)
       strcpy(txtMsg, str);
    }
    int CuriousTabFunction(char ch);
};
int CuriousTab::CuriousTabFunction(char ch)
{
    static int i = 0;
    if(txtMsg[i++] == ch)
        return strlen((txtMsg + i)) - i;
    else
        return CuriousTabFunction(ch);
}
int main()
{
    CuriousTab objCuriousTab("Welcome to CuriousTab.com!");
    cout<< objCuriousTab.CuriousTabFunction('t');
    return 0;
}

#include<iostream.h> 
class CuriousTabData
{
    int x, y, z; 
    public:
    CuriousTabData(int xx, int yy, int zz)
    {
        x = ++xx;
        y = ++yy;
        z = ++zz;
    }
    void Show()
    {
        cout<< "" << x++ << " " << y++ << " " << z++;
    } 
}; 
int main()
{
    CuriousTabData objData(1, 2, 3);
    objData.Show();
    return 0; 
}

class CuriousTab
{
    public:
    static void MyFunction();
};
int main()
{
    void(*ptr)() = &CuriousTab::MyFunction;
    return 0; 
}