Array class using ExceptionHandling

#include <iostream>
#include <cstdlib>

using namespace std;

#define CAP 10
class Array{
    int arr[CAP];
    int size;
    public:
        Array(int=CAP);
        ~Array(){ }
        class InvalidSizeException{
            int size;
            public:
                InvalidSizeException(int size){
                    InvalidSizeException::size = size;
                }
                void display(){
                    cout << "InvalidSizeException" << endl;
                    cout << size << ": exceeds the capacity " << CAP << endl;
                }
        };
        class ArrayIndexOutOfBoundsException{
            int index;
            public:
                ArrayIndexOutOfBoundsException(int index){
                    ArrayIndexOutOfBoundsException::index = index;
                }
                void display(){
                    cout << "ArrayIndexOutOfBoundsException for index " << index
                        << endl;
                }
        };
        int& operator[](int);
};

Array::Array(int size){
    if(size <= 0 || size > CAP){
        throw InvalidSizeException(size);
    }
    else{
        Array::size = size;
    }
}

int& Array::operator[](int index){
    if(index < 0 || index >= size){
        throw ArrayIndexOutOfBoundsException(index);
    }
    return arr[index];
}

int main() {
    int size;
    try{
        cout << "Enter the size of the array: ";
        cin >> size;
        Array obj(size);
        cout << "Input elements in the array" << endl;
        for(int i = 0; i < size; i++){
            cout << "arr[" << i << "] = ";
            cin >> obj[i];
        }
        int index;
        cout << "Enter the index location: ";
        cin >> index;
        cout << "Element at " << index << " is " << obj[index];
    }
    catch(Array::InvalidSizeException i){
        i.display();
    }
    catch(Array::ArrayIndexOutOfBoundsException a){
        a.display();
    }
    return 0;
}