A set of snippets for the language C++

class_declarations.cpp

class Animal{
	public:
		int legs;
		string name;
		
		Animal(string name){
			this->name = name;
			this->legs = 4;
		}
};

int main(){
	// as an object ( in stack )
	Animal panda("Panda");
	cout << panda.name << " " << panda.legs << endl;
	
	// as an object pointer using new keyword ( in heap )
	Animal *turtle = new Animal("Turtle");
	cout << panda->name << " " << panda->legs << endl;
	delete turtle;
	
	// array of objects with constructor( stack )
	Animal zoo[3] = {Animal("Panda"),Animal("Lion"),Animal("Goat")};
	for( int i = 0; i < 3; i++ ){
		cout << zoo[i].name << " " << zoo[i].legs << endl;
	}
	
	// array of objects with constructor( heap )
	Animal *zoo[3];
	zoo[0] = new Animal;
	zoo[1] = new Animal("Lion",40);
	zoo[2] = new Animal("Goat")
	for( int i = 0; i < 3; i++ ){
		cout << zoo[i].name << " " << zoo[i].legs << endl;
	}
	
	// or ( cannot use constructor ) - declared and created simultaniously
	Animal *zoo;
	zoo = new Animal[3];	// important line
	for( int i = 0; i < 3; i++ ){
		cout << zoo[i].name << " " << zoo[i].legs << endl;
	}
	
	// or ( cannot use constructor ) - declared but not created
	Animal **zoo;
	zoo = new Animal*[3];	// important line ( only declared )
	zoo[0] = new Animal;	// created
	zoo[1] = new Animal("Lion",40);	// created
	zoo[2] = new Animal("Goat");	// created
	for( int i = 0; i < 3; i++ ){
		cout << zoo[i]->name << " " << zoo[i]->legs << endl;
	}
	
	return 0;
}

If constructor doesn't take any argument,
Animal sheep() // will throw error
Animal sheep // will work