#include <iostream>

struct Car
{
  Car(int w) : wheels(w) {}
  int wheels;
};

struct Toyota : public Car
{
  // member initializer list can be used for base classes or member variables
  Toyota(int w, double p) : Car(w), price(p) {}
  double price;
};

int main(int argc, char** argv)
{
  Toyota prius(4, 25000);

  std::cout << "price: " << prius.price << std::endl;
  std::cout << "wheels: " << prius.wheels << std::endl;
  return 0;
}