Сlass-фамилия и имя

#include <iostream>
#include <string>

using namespace std;
 class person{
public:
    string name;
    string surname;
    int age;
    person(string name_, string surname_, int n){
        name = name_;
        surname = surname_;
        age = n;
    }
    person(string name_, string surname_ ){
        name = name_;
        surname = surname_;
        age = 0;
    }
    void say_hello(){
        if(age == 0){
            cout <<"hello my name is " << name << " " << surname << endl;
        }
        else{
            cout <<"hello my name is " << name << " " << surname << ". I'm " << age << " years old."<< endl;
        }
    }

};


int main()
{
    person b = person("Roman", "Sayapin");
    person c = person("Michaile","Novikov",18);
    b.say_hello();
    c.say_hello();
}