Object Declaration and Variable Access

#include<iostream>
using namespace std;


class Device
{
public:
    int id;

    void setvalue(int d)
    {
        id = d;
    }

    void displayValue()
    {
        cout<<"Device ID: "<<id;
    }
};

int main()
{
    Device d;
    d.setvalue(101);
    d.displayValue();
    return 0;
}