#include "stdafx.h"
#include <iostream>
#include <string.h>

using namespace std;

/*
typedef int * intp;

// intp *D;
// D[i] = new int[4];
*/

int main()
{
	int n;
	cout << "How many elements?";
	cin >> n;

	int *A;
	// A[2] = 56; // accessing a location in memory that is not yours

	A = new int[n];
	if (A == NULL) {
		cout << "Out of mem!" << endl;
		exit(0);
	}
	A[2] = 56; // accessing a location in memory that is yours now

	// ...

	delete [] A;		// return the memory to the operating system

	// allocate 1D array using the C syntax
	int *B;
	B = (int *) malloc(n * sizeof(int));
	if (B == NULL) {
		cout << "Not enought mem" << endl;
		exit(0);
	}
	B[23] = 6;
	//...
	free(B);


	// allocate 2D array using C++ syntax
	int *C;
	C = new int[10*5];
	// C[2][3] = 67;
	C[2 * 5 + 3] = 67;
	delete[] C;

	// version 2
	int **D;
	D = new int *[5];
	for (int i = 0; i < 5; i++) {
		D[i] = new int[4];
		//.. D[i] == NULL?
	}
	D[2][3] = 67;

	for (int i = 0; i < 5; i++) {
		delete [] D[i];
	}
	delete[] D;



	return 0;
}