what is use of declaring C++ class without name

class{public: int x;} xaaa1, xbbb1, xccc1;
class{public: int y;} xaaa2, xbbb2, xccc2;

int main()
{
    xaaa1.x = 1;
    xaaa2.y = 2;
    xbbb2.y = 3;
    cout<< "xaaa1.x = "<< xaaa1.x<< ";  xaaa2.y = "<<  xaaa2.y
        << "; xbbb2.y = "<<  xbbb2.y<< "; xaaa1.x +  xaaa2.y + xbbb2.y = "
        << xaaa1.x +  xaaa2.y + xbbb2.y<< endl;

class bazz{} a;
int main()
{
    bazz b;
    bazz;
    int;