#include<iostream>
using namespace std;

class animal {
private: // people don't write private here usually because it's the default for class
	string name;
	string type;
	int age;
public:
	friend ostream& operator<<(ostream& os, animal a);

	animal(){ // This is a default constructor
		name = "default name";
		type = "default type";
		age = 0;
	}

	animal(string n, string t, int a){ // this is called a constructor
		name = n;
		type = t;
		age = a;
	}

	void get_older(){
		age++;
	}

	string get_string(){
		return name + " " + type + " ";
	}	
};

ostream& operator<<(ostream& os, animal a){
	return os << a.name << " " << a.type << " " << a.age << " ";
}

int main(){
	animal a("Elsie", "Cat", 14);
	a.get_older();
	a.get_older();
	a.get_older();
	a.get_older();
	cout << a << endl;

	animal b;
	cout << b << endl;
	return 0;
}