C++ dynamic_cast Casting Instances Dynamically

#include <iostream>
#include <string>

using namespace std;

class King/*from  ww w.j a v a2  s.  co  m*/
{
protected:
    string CrownName;
public:
    virtual string &MyName() { return CrownName; }
    virtual ~King(){}
};

class Prince : public King
{
public:
    string School;
};

void KingInfo(King *inst)
{
    cout << inst->MyName() << endl;
    Prince *asPrince = dynamic_cast<Prince *>(inst);

    if (asPrince != 0){
        cout << asPrince->School << endl;
    }
}

int main()
{
    Prince g;
    g.MyName() = "fdsa";
    g.School = "test test test";
    KingInfo(&g);
    King Henry;
    Henry.MyName() = "new name";
    KingInfo(&Henry);
    return 0;
}