#include <iostream>
#include <string>
using namespace std;

class Student
{
private:
    int ID;
    string name;
    double grade;
public:
    Student()
{
    setID(0);
    setName(" ");
    setGrade(0);
}
void setID(int x)
{
    if(x<0)
        cout<<"Invalid value, please enter a positive ID!";
    else
        ID=x;
}
void setGrade(double x)
{
    while(x<0)
    {
        cout<<"Invalid value, please enter a positive grade!";
    }
        grade=x;
}
void setName(string a)
{
    if(a.size()>0)
        name=a;
    else
        cout<<"Invalid name";
}
int getID()
{
    return ID;
}
string getName()
{
    return name;
}
double getGrade()
{
    return grade;
}
void print()
{
    cout<<"the ID is: "<< ID<<endl;
    cout<<"the name is "<<name<<endl;
    cout<<"the grade is "<<grade<<endl;
}

void readinfo()
{
    int id;
    string name=" ";
    double g;
    cout<<"enter ID :";
    cin>>id;
    setID(id);
    cout<<"Enter name: ";
    cin>>name;
    setName(name);

    cout<<"Enter grade: ";
    cin>>g;
    setGrade(g);
}
};
int main()
{
    Student st[10];
    for(int i=0; i<10;i++)
    {
        st[i].readinfo();
        st[i].print();
    }
}