Why is not working

Question

#include <iostream>
using namespace std;
class person :
{
Protected :
int id ;
int name;
int age;
public:
void store();
void display();
};
class football_player :
{
Protected:
Int Salary;
Int Numberofmatches;

public:
void store();
void display();
int salary (Numberofmatches)
{
Salary = Numberofmatches * 2 +100
}
};
Class basketball_player:
{
Protected:
Int Numberofcores;
public:
void store();
void display();
};
int main() {
person obj1;
obj.id;
obj.name;
obj.age;
return 0;
}

Answer 1

you created the object
obj1
Not obj
So to access class members
Use obj1.id;
Net obj.id

Answer 2

Bye the way code has many basics error

Answer 3

Where are the mistakes?