C++ program to overload operator [ ]

/* C++ program to overload [] operator */

#include<iostream>
#include<stdlib.h>
using namespace std;

class overload
{
    private:int *p;
            int s;
    public: overload(int *,int);
            int & operator[](int);
            void showdata()const;
            ~overload();
};

overload :: overload(int *ptr=NULL,int s1=0)
{
    p=NULL;
    s=s1;
    if(s!=0)
    {
        p=new int[s];
        for(int i=0;i<s;i++)
            p[i]=ptr[i];
    }
    cout<<"\n Object created....";
}

int & overload :: operator[](int x)
{
    if(x>=s)
    {
        cout<<"\n Array is out of bounded";
        exit(0);
    }
    return(p[x]);
}

void overload :: showdata()const
{
    cout<<"\n The element of array:";
    for(int i=0;i<s;i++)
        cout<<"\n\t\t\t" <<p[i];
}

overload :: ~overload()
{
    delete[] p;
}

int main()
{
    int a[ ]={1,2,3,4,5};
    overload q(a,5);
    overload w;
    q.showdata();
    q[2]=6;
    q.showdata();
    q[8]=10;
    q.showdata();
    w.showdata();
    return(0);
}

Output