#include <iostream>
#include <string>

using namespace std;

class Person1T{
    public:
        Person1T(){
             cout << "In person 1 constructor " << endl;
             return;
        }

        int Age(void) const {
           return age;
        }

    private:
        string name="none";
        int age=-1;
};

class Person2T{
     public:
        Person2T() {
             name = "none";
             age = -1;
             cout << "In person 2 constructor " << endl;
             return;
        }

        int Age(void) const {
           return age;
        }
     private:
         string name;
         int age;
};

class Person3T{
     public:
        Person3T():
           name("none"), age(-1) {
           cout << "In person 3 constructor " << endl;
           return;
        }

        int Age(void) const {
           return age;
        }

     private:
         string name;
         int age;
};

class Person4T{
     public:
        Person4T( string n="none", int a=-1 ):
           name(n), age(a) {
           cout << "In person 4 constructor " << endl;
           return;
        }

        int Age(void) const {
           return age;
        }

     private:
         string name;
         int age;
};

class Person4AT{
     public:
        Person4AT( string n, int a=-1 ):
           name(n), age(a) {
           cout << "In person 4 constructor " << endl;
           return;
        }

        int Age(void) const {
           return age;
        }

     private:
         string name;
         int age;
};

class Person5T{
     public:
        Person5T( string n, int a ): name(n), age(a) {
           cout << "In person 5 constructor " << endl;
           return;
        }

        int Age(void) const {
           return age;
        }

     private:
         string name;
         int age;
};

class Person6T{
     public:
        Person6T()= default;
        Person6T( string n, int a ):
           name(n), age(a) {
           cout << "In person 6 constructor " << endl;
           return;
        }

        int Age(void) const {
           return age;
        }
     private:
         string name="none";
         int age = -3;
};

class Person7T{
     public:
        Person7T() = delete;
        Person7T( string n="none", int a=-1 ):
           name(n), age(a) {
           cout << "In person 4 constructor " << endl;
           return;
        }

        int Age(void) const {
           return age;
        }

     private:
         string name;
         int age;
};

class Person7AT{
     public:
        Person7AT() = delete;
        int Age(void) const {
           return age;
        }

     private:
         string name;
         int age;
};

class Person8T{
     public:
        int Age(void) const {
           return age;
        }

     private:
         Person8T() {
            cout << "Hello World " << endl;
         }
         string name;
         int age;
};

int main() {
 
    Person1T a;
    Person2T b;
    Person3T c;
    Person4T d;
    //Person5T e;
    //Person5T e[100];
    //vector<Person5T> v;
    Person6T f;
    // Person7T g;
     //Person7AT h;
     //Person8T i;
    

    Person4T x{"hello",4};
    Person5T y{"world",5};
    Person5T z("hi", 7);

    cout << a.Age() << " " << b.Age() << " "
         << c.Age() << " " << d.Age() << " "  
         << f.Age()<< endl;
    return 0;
}