/*****************************************************************************
 * File: oop.decaf
 * Author: Keith Schwarz (htiek@cs.stanford.edu)
 *
 * Sample Decaf code showing off its object-oriented features.
 */

class Animal { // Animals make great inheritance examples! :-)
    string getName() {
        return "Some animal";
    }

    int getMass() {
        /////////////////////////////////////////////////////////////////////
        // There's no good implementation for this method.  Decaf does not //
        // support purely abstract methods, but it does allow you to have  //
        // a method that just falls off the end.  That's what we'll do     //
        // here.                                                           //
        /////////////////////////////////////////////////////////////////////
    }
}

class Dog extends Animal { // Inheritance!
    string getName() {
        return "Dog";
    }
    int getMass() {
        return 20;
    }
}

class Cat extends Animal {
    string getName() {
        return "Cat";
    }
    int getMass() {
        return 4;
    }
}

/* Utility function to print out a description of an animal. */
void PrintAnimal(Animal animal) {
    Print(animal.getName());
    Print(" has mass ");
    Print(animal.getMass());
    Print("kg\n");
}

int main() {
    PrintAnimal(new Dog);
    PrintAnimal(new Cat);
}