#include<iostream>
#include<string>
using namespace std;
class Student{
public:
    long long int Roll;
   std:: string name;
    float Marks;
    void GetData();
    void Display();
};
void Student::GetData()
{
    cout<<"Enter Roll : ";
    cin>>Roll;
    cout<<"Enter name : ";
    cin.getline(name,40);//getline(cin,name);
    cout<<"Enter Marks : ";
    cin>>Marks;
}
void Student::Display()
{
    GetData();
    cout<<"\nRoll is : "<<Roll<<endl;
    cout<<"name is : "<<name<<endl;
    cout<<"Marks is : "<<Marks<<endl;
    if(Marks<0)
        cout<<"invalid Marks!"<<endl;
}
int main()
{
    Student s;
    s.Display();
}