example to show the difference between dynamic cast and c style cast.

ClassHierarchy.cpp

class BaseA
{
public:
    virtual void foo()=0;
};

class BaseB
{
public:
    virtual void bar(int a)=0;
};

class Child: public BaseA, public BaseB
{
public:
    void foo()
    {
        cout<<"i'm foo in Child!"<<endl;
    };
    void bar(int a)
    {
        cout<<"i'm bar in Child!"<<endl;
    };
};

Main.cpp

int main() {

    BaseB* b = new Child();
    BaseA* a = (BaseA*)b;
    BaseA* a2 = dynamic_cast<BaseA*> (b);
    // This is actually calling bar(),
    // and will cause Runtime check failure about ESP if the foo and bar have different signature.
    a->foo(); 
    a2->foo();
}