Say we had a Person object that has age, height, and weight and passes it into height_times_weight:

  
void height_times_weight(Person* person_ptr){
	Person person_obj = *person_ptr;
	int age = person_obj.age;
	...
}


int main(){
	Person person(1,2,3);
	height_times_weight(&person);
}

However, In C++ we could also do this:

  void height_times_weight(Person &person){
	int age = person.age;
	...
}

int main(){
	Person person(1,2,3);
	height_times_weight(person);
}

The two examples do exactly the same thing

Think of the Person &person in height_times_weigh() as automatically putting a & whenever we call it like how it is above.

This saves us from writing the & but also saves us from dereferencing it while in height_times_weight.