private data member is accessed and no error

[pankajkumar911]

Here in below code, the private data member is accessed directly using dot operator IN COPY CONSTRUCTOR and the program runs without error.
Please explain....

#include <cstdlib>
#include <iostream>
using namespace std;

class array {
	int *p;
	int size;
public:
	array(int sz)
	{
		p = new int[sz];
		size = sz;
	}
	~array() { delete [] p; }
// copy constructor
	array(const array &a);
	void put(int i, int j) 
	{
		if(i>=0 && i<size) p[i] = j;
	}
	int get(int i)
	{
		return p[i];
	}
};

// Copy Constructor

array::array(const array &a) {
	int i;
	p = new int[a.size];
	for(i=0; i<a.size; i++) p[i] = a.p[i];
}

int main()
{
	array num(10);
	int i;
	for(i=0; i<10; i++) 
		num.put(i, i);
	for(i=9; i>=0; i--) 
		cout << num.get(i);
	cout << "\n";
	
	array x(num); // invokes copy constructor
	
	for(i=0; i<10; i++) 
		cout << x.get(i);
	
	return 0;
}

[booradley60]

The copy constructor is a member of the class. Therefore, it has access to the private members of the class.