Type cast

#include <iostream>

using namespace std;

class type2 {
   public:
    int a, b;
    type2(int a, int b): a(a), b(b) { }
};

class type1 {
public:
    int ab;
    type1(int ab): ab(ab) { }
    type1(type2 t) {
        ab = t.a * t.b;
    }
};

int main() {
    type2 t2(3, 4);
    cout << t2.a << " " << t2.b << endl;
    cout << ((type1)t2).ab << endl;
    return 0;
}