Type conversion in C ++

# Include <iostream>
Using namespace STD;
Int main (void)
{

Cout <"1111:" <typeid (1.1f). Name () <Endl;
Cout <"1111:" <typeid (1). Name () <Endl;
Cout <"1111:" <typeid ('C'). Name () <Endl;
Class base1
{
};

Class derive1: Public base1
{
};
Derive1 D1;
Base1 & b1 = D1;
Cout <"2222:" <typeid (B1). Name () <Endl; // output "class base1" because there is no polymorphism between derive1 and base1
// Add the parameter/GR during compilation
Class base2
{
Virtual void fun (void ){

}
};

Class derive2: Public base2
{

};
Derive2 D2;

Base2 & b2 = d2;
Base2 * P = & D2;
Cout <"3333:" <typeid (B2). Name () <Endl; // output "class derive2" because there is a polymorphism between derive1 and base1

class derive22: Public base2
{< BR >};
// after the forced conversion of the pointer fails, you can compare whether the pointer is zero, but there is no way to reference it, therefore, an exception is thrown after the conversion fails.
derive2 * PB1 = dynamic_cast (p);
cout <"333_1: " derive22 * master = dynamic_cast (P );
cout <"333_2:"

try {
derive2 & rb= dynamic_cast (B2);
cout <"4444:" <"true" }< br> catch (bad_cast)
{< br> cout <"5555:" <"false" }< br> try {
derive22 & Rb2 = dynamic_cast (B2);
cout <"6666: "<" true " } catch (...)
{< br> cout <"7777:" <"false" }< br> getchar ();
return 0;
}