Union

#include <iostream>using namespace std;union U {    private: // Access control too!      int i;      float f;    public:      U(int a);      U(float b);      ~U();      int read_int();      float read_float();    };    U::U(int a) { i = a; }    U::U(float b) { f = b;}    U::~U() { cout << "U::~U()\n"; }    int U::read_int() { return i; }    float U::read_float() { return f; }    int main() {      U X(12), Y(1.9F);      cout << X.read_int() << endl;      cout << Y.read_float() << endl;    }