Запись случайных чисел в массив

#include <random>
...
std::tr1::mt19937 eng;
std::tr1::poisson_distribution<double>poisson(5.0);
std::cout << poisson(eng) << std::endl;

#include "stdafx.h"
#include <iostream>
#include <random>
 
int _tmain(int argc, _TCHAR* argv[])
{
    std::tr1::mt19937 eng;
    std::tr1::poisson_distribution<double>poisson(5.0);
    int n;
    std::cout << "Enter n:";
    std::cin >> n;
 
    double *A = new double[];
 
    for (int i = 0; i < n; i++)
        std::cout << poisson(eng) << "\n";
 
    delete []A;
 
//  system("pause");
    return 0;
}

#include "stdafx.h"
#include <iostream>
#include <random>
 
int _tmain(int argc, _TCHAR* argv[])
{
    std::tr1::mt19937 eng;
    std::tr1::poisson_distribution<double>poisson(5.0);
    int n;
    std::cout << "Enter n:";
    std::cin >> n;
 
    double *A = new double[];
 
    for (int i = 0; i < n; i++)
//      std::cout << poisson(eng) << "\n";
        A[i] = poisson(eng);
 
    for (int i = 0; i < n; i++)
        std::cout << A[i] << "\n";
 
    delete []A;
 
//  system("pause");
    return 0;
}

double *A = new double[n];

#include <iostream>
 
int main(){
    int * a = new int[];
    *a = 13;
    std::cout << *a << std::endl;
    return 0;
}