#include <string.h>

enum T {
  INT,
  DOUBLE,
  STRING
};

class A {
public:
  T t;
  int i;
  double d;
  char *s;

  A (enum T);
};

class B : public A {
public:
  B (int);
  B (double);
  B (const char *);
};

A::A (enum T t) {
  this->t = t;
}

B::B (int i) : A (INT) {
  this->i = i;
}

B::B (double d) : A (DOUBLE) {
  this->d = d;
}

B::B (const char *s) : A (STRING) {
  this->s = strdup (s);
}

int main () {
  A a1 = B (123);
  A a2 = B (1.23);
  A a3 = B ("foo");
  return 0;
}