C++ Inharitance Problem For Driver Class

You should declare the methods you wish to override in the derived classes as virtual. There is no "default virtual" in C++ (I use C++98 so maybe it has been introduced recently).

#include <iostream>
using namespace std;
class Practice
{
protected:
int ID,Pay;
string Name;
public:
//New Syntax Of Default Constructor
Practice():ID(0),Pay(0),Name(""){}
//Here Is Prameterized Constructor
Practice(int I,int P,string N)
{
ID=I;
Pay=P;
Name=N;
}
~Practice()
{
}
void GetData()
{
cout<<"Employee Name:"<<Name<<"\n\nEmployee ID:"<<ID<<"\n\nEmployee Pay:"
<<Pay<<endl;
}
//Destructor
};
//Now Going To Create Second Class For Inharitance
class Pay_Roll:public Practice
{
private:
int Salary;
public:
//Create Constructor For Accessing The Base Class Value
Pay_Roll(int ID,int Pay,string Name,int S)
:Practice(ID,Pay,Name)
{
Salary=S;
}
~Pay_Roll()
{
}
//Now Used Constructor Foe Second Employee Data
// int Ids()
// {
// return ID;
// }
void GetData()
{
// stringstream SS;
cout<<"\n\nEmployee Name:"<<Name<<"\n\nEmployee ID:"
<<ID<<"\n\nEmployee Pay:"
<<Pay<<"\n\nEmployee Salary:"<<Salary
<<endl;
}
};
//Now Make Another Derived Class With Base Class
//class Show_Class:public Practice
//{
// public:
// TakeData(int s)
// :Practice(ID,Pay){};
//};
int main()
{
Practice Obj1(12,35000,"Muhammad Qasim");
Obj1.GetData();
Pay_Roll obj2(13,40000,"Muhammad Usman",50000);
obj2.GetData();
return 0;
}