Environment::RemoveFish(const Position & pos)
// pre: there is a fish at pos (IsEmpty(pos) is false)
// post: fish removed from pos; IsEmpty(pos) is true
{
	if (IsEmpty(pos))
	{
		cerr << "error - attempt to remove nonexistent fish at:"
		     << pos << endl;
		return;
	}
	Fish undefinedFish;
	myWorld[pos.Row()][pos.Col()] = undefinedFish;
	myFishCount--;
}

void Fish::Breed(environemnt & env)
// pre: this fish is stored in env at Location();
//	    this fish is old enough  to breed
// post: the neighoring empty positions of thhis fish have been
//		 filled with new fish, each with age 0 and the same
//		 probability of dying as this fish
{
	Neighborhood nbrs = EmptyNeighbors(env, myPos);
	for (int k = 0; k < nbrs.Size(); k++)
		env.AddFish(nbrs.Select(k), 0, myProbDie, myProbBreed);
}

void Fish::Act(Environment & env)
// pre: this fish is stored in env at Location()
// post: this fish has moved, bred, or died
{
	RandGen r;
	
	if(r.RandReal() < myProbDie)
	{
		env.RemoveFish(myPos);
		return;
	}
	mmyAge++;
	if(myAge == 3)
	{
		Breed(env);
	}
	else
		Move(env);
}

int main ()
{
	cout << "Ap-A Exam Question #3" << endl;

	return 0;
}