class Pet
 string name
 int age
 
 void eat()
	print name + " eats"
 end eat
 
 void makeNoise()
	print name + " yips"
 end makeNoise
 
end class

class Dog inherits Pet
 string breed
 Dog * friend
 Cat * enemy
end class

void main()
 Pet * p = new Pet
 p.name = "Petty"
 p.eat()
 
 Dog * d = new Dog
 d.name = "Fido"
 d.breed = "Pugweiloodle"
 d.eat()
end main

----------------------------
class Pet
 // other stuff
 
 void eat()
	print name + " eats"
 end eat
 
 void makeNoise()
	print name + " yips"
 end makeNoise
 
end class

class Cat inherits Pet

 void makeNoise()
	print name + " goes miaow"
 end makeNoise
 
 void eat(Budgie * b)
  	print name + " eats " + b.name
 end eat
 
end class

void main()
 Dog * d = new Dog
 d.name = "Fido"
 d.breed = "Pugweiloodle"
 d.makeNoise()
 
 Cat * c = new Cat
 c.name = "Muffy"
 c.makeNoise()
 c.eat()
 
 Budgie * b = new Budgie
 c.eat(b)
end main
----------------------------
void main()
 Pet * p
 String user = prompt "dog, cat, or budgie?"
 if (user == "dog") then
	p = new Dog
 else if (user == "cat") then
	p = new Cat
 else 
	p = new Budgie
 end if

 p.name = prompt "what name?"
 p.age = prompt "how old"
 p.eat()
 p.sleep()
 p.makeNoise() // which method called?

 p.breed = "mutt" // error, not all Pets have breed
 p.eat(new Budgie) // error not all Pets eat budgies
 p.fly()  // error not all pets can fly

 Pet * p2 = new Budgie
 p2.name = "Mr. Furious"
 p2.fly() // error even if we KNOW it is pointing at a budgie, we can only do Pet things 

----------------------------
// not actually pseudocode, just a design outline
// of multiple levels of inheritance
class Animal {
	void eat()
	void move()
	void sleep()
}

class Lizard inherits Animal{
   void layEggs()
}

class Mammal inherits Animal {
     void gestate()
}

class Chameleon inherits Lizard {
   void changeColor() 
}

class Cheetah inherits Mammal {
	// move faster
	 void move()
}

class Sloth inherits Mammal {
   // move slower
   void move()
   void hangUpsideDown()
}

----------------------------
class Bird
  int eggs
  
  void chirp() 
  	print "chirp"
  end chirp
  
  void fly() 
  	print "fly by flapping"
  end fly
end Bird

class Sparrow inherits Bird
	void chirp()
		print "chirp chirp chirp"
	end chirp
end Sparrow

class Albatross inherits Bird
	void fly()
		print "fly by gliding"
	end fly
end Albatross

class Penguin inherits Bird
	void fly()
		print "can't fly"
	end fly

	void swim()
		print "glides through the water"
	end fly
end Penguin	

void main() 
	Bird * birdlist[3]
	birdlist[0] = new Sparrow
	birdlist[1] = new Albatross
	birdlist[2] = new Penguin
	
	for(int i = 0; i < birdlist.size; i = i + 1) 
		birdlist[i].chirp()
		birdlist[i].fly()
	end for
end main