Day4.cpp

using namespace std;
#include <iostream>

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

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

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

    }

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