Virtual Base Class ( Student, Marks, Behaviour, ECA & Result ) C++ Program

#include<conio.h>
#include<iostream.h>

class student
{
    public:
    int roll,id;
    char name[20],std[6];
    void getstudent()
    {
        cout<<"\n\tEnter Student Details \n";
        cout<<"\nEnter ID No :";cin>>id;
        cout<<"\nEnter STD : ";cin>>std;
        cout<<"\nEnter Name : ";cin>>name;
    }
};