virt.cpp
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#include <iostream>
using namespace std;
class a {
public:
void print1()
{
cout << "1" << endl;
};
virtual void print2()
{
cout << "2" << endl;
};
};
class b : public a {
public:
void print1()
{
cout << "11" << endl;
};
void print2()
{
cout << "22" << endl;
};
};
void fun(a* p)
{
p->print1();
p->print2();
}
int main()
{
a aa;
b bb;
fun(&aa);
fun(&bb);
return 0;
}