inheritence problem

hi i have a problem with this example that i copy online and is not working can someone help me

Code:

---

#include<stdio.h>
#include<conio.h>
#include<iostream>
using namespace std;
class person
{
   
  public:
           
            int age;
          person(int age){ this -> age =age;}
 
};

class basketballplayer:public person
{
            public:
            int point;
            int steal;
            basketballplayer(int point, int steal, int age):person(age)
            {
              this -> point = point;
              this -> steal = steal;
           
            };
           
   
};

main()
{
      basketballplayer tony; //why  is this not working
      tony.age=11;
   
    getch();
}

---

You have declared tony as a bb player, but you have not instantiated tony.

what is instantiated tony

The basketballplayer constructor requires 3 arguments, but you have supplied none.
I'd also suggest properly indenting the code, making the member variables private.
And finally making main return int, or the code will not compile.

Example:
basketballplayer tony(100, 100, 10000);