where is the error if there is error- c++ example

examexamples.cpp

#include <iostream>

//#define TEST1 //yanlıs obje olusmaz
//#define TEST2 //yanlıs A da c dıe bısı yok
//#define TEST3 //yanlıs upcasting downcasting olayı
//#define TEST4 //calısıo
//#define TEST5 //yanlıs templatelık

class A
{
public:
A(): a(-1), b(-2){}
virtual void f1() = 0;
int a;
int b;
};

class B: public A
{
public:
B(): b(1), c(2) {}
void f1() { std::cout << a+b+c;}
int b;
int c;
};

#ifdef TEST5
template<class T>
class C:public B
{
void f1()
{a++;}
};
#endif


int main()
{

#ifdef TEST1
A v1;
v1.a = 10.0;

#endif

#ifdef TEST2
B v2;
A * aPtr;
aPtr = &v2;
aPtr->f1();
aPtr->c=12;

#endif

#ifdef TEST3
B v2;
A * aPtr = &v2;
B * bPtr ;
aPtr->f1();
bPtr = aPtr;
bPtr->f1();

#endif

#ifdef TEST4
B v2;
A & aRef = v2;
aRef.f1();

#endif

    return 0;
}