C++ program to implement the array of objects and pointer pointing to it:

Arrayofobj.cpp

#include<iostream>
#include<string>

using namespace std;

class student{
    string name;
    int rollno;

    public:
        void initialize(string n,int r);
        void display();
};

void student::initialize(string n,int r){
    name=n;
    rollno=r;
}

void student::display(){
    cout<<"Student Details : \n";
    cout<<"Roll No : "<<rollno<<endl;
    cout<<"Name : "<<name<<endl;;
}

int main()
{
    int n,i;
    string nam;
    int roll;
    cout<<"Enter the no of students...";
    cin>>n;

    student s[n];
    student *ptr,*p[n];
    cout<<"\nEnter the student details one by one..";
    for(i=0;i<n;i++){
        cout<<"\nEnter the roll no followed by name ";
        cin>>roll>>nam;
        s[i].initialize(nam,roll);
        p[i]=&s[i];
    }

    cout<<"\nDisplaying the Student database by using a single pointer to an array of objects";
    ptr=s;
    for(i=0;i<n;i++){
        ptr->display();
        ptr++;
    }
    cout<<"\nDisplaying the Student database by using array of pointers\n";
    for(i=0;i<n;i++){
        p[i]->display();
    }
    return 0;
}