C++ Function in Class

#include<iostream>
using namespace std;
class anik
{
public :
    int id;
    double cgpa;

    rob()
    {
        cout << "ID :: " << id << "\nCGPA :: " << cgpa << endl;
    }
};
int main()
{
    anik faria;

    faria.id = 18101073;
    faria.cgpa = 3.96;
    faria.rob();

    return 0;
}