Day 4.cpp

#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;

class Person {
public:
    int age;

    Person(int initialAge);

    void amIOld();

    void yearPasses();
};

Person::Person(int initialAge) 
{
    if (initialAge > 0) age = initialAge;
    else 
    {
        age=0;
        cout << "Age is not valid, setting age to 0." << endl;
    }
}

void Person::amIOld() 
{
    
    if (age < 13) 
    cout << "You are young." << endl;
    else if (age < 18) 
    cout << "You are a teenager." << endl;
    else 
    cout << "You are old." << endl;
}

void Person::yearPasses() 
{
    age++;
}

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 <<endl;
    }

    return 0;

}