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#include <iostream>
using namespace std;
 
class A
{
public:
    static std::string ClassName;
 
    virtual void print() { cout << ClassName << endl; }
};
 
class B
    : public A
{
};
 
class C
    : public B
{
};
 
string A::ClassName = "Klasa A";
string B::ClassName = "Klasa B";
string C::ClassName = "Klasa C";
 
int main() {
 
	A a;
	B b;
	C c;
	a.print();
	b.print();
	c.print();
	return 0;
}

prog.cpp:23:11: error: ISO C++ does not permit 'A::ClassName' to be defined as 'B::ClassName' [-fpermissive]
 string B::ClassName = "Klasa B";
           ^
prog.cpp:23:11: error: redefinition of 'std::string A::ClassName'
prog.cpp:22:8: note: 'std::string A::ClassName' previously declared here
 string A::ClassName = "Klasa A";
        ^
prog.cpp:24:11: error: ISO C++ does not permit 'A::ClassName' to be defined as 'C::ClassName' [-fpermissive]
 string C::ClassName = "Klasa C";
           ^
prog.cpp:24:11: error: redefinition of 'std::string A::ClassName'
prog.cpp:22:8: note: 'std::string A::ClassName' previously declared here
 string A::ClassName = "Klasa A";
        ^

Standard output is empty