Day 4: Class vs. Instance

using namespace std;
#include <iostream>

class Person {
public:
  int age;
  Person(int initialAge);
  void amIOld();
  void yearPasses();
};

Person::Person(int initialAge) {
  // Add some more code to run some checks on initialAge
  if (initialAge > 0) {
    age = initialAge;

  } else {
    age = 0;
    cout << "Age is not valid, setting age to 0." << endl;
  }
}

void Person::amIOld() {
  // Do some computations in here and print out the correct statement to the
  // console
  if (age < 13) {
    cout << "You are young." << endl;
  } else if (age >= 13 && age < 18) {
    cout << "You are a teenager." << endl;
  } else if (age >= 18) {
    cout << "You are old." << endl;
  }
}

void Person::yearPasses() {
  // Increment the age of the person in here
  age += 1;
}

int main(){
    int t;
	int age;
    cin >> t;
    for(int i=0; i < t; i++) {
    	cin >> age;
        Person p(age);
        p.amIOld();
        for(int j=0; j < 3; j++) {
        	p.yearPasses();
        }
        p.amIOld();

		cout << '\n';
    }

    return 0;
}