C++ array container reverse_iterator rbegin rend

#include <iostream>
#include <uuid/uuid.h>
#include <time.h>
#include <array>
#include <iterator>
#include <ctime>
#include <random>
#include <algorithm>

using namespace std;

void random3();

int main()
{
    random3();
    return 0;
}

void random3()
{
    srand(time(nullptr));
    array<int, 100> arr;
    int len = arr.size();
    for (int i = 0; i < len; i++)
    {
        arr[i] = rand()%10000;
    }

    cout << "\n\nBefore sorting!" << endl;
    for (int i = 0; i < len; i++)
    {
        cout << arr[i] << "\t";
    }

    cout << endl<<endl;
    std::sort(arr.begin(), arr.end());
    cout<<"\nAftrer sort ascendingly output"<<endl;
    array<int,100>::iterator itr2=arr.begin();
    while(itr2!=arr.end())
    {
        cout<<*itr2<<"\t";
        ++itr2;
    }
    cout<<endl<<endl;
    cout << "\nAfter sort descendingly" << endl;
    array<int,100>::reverse_iterator itr=arr.rbegin();
    while(itr!=arr.rend())
    {
        cout<<*itr<<"\t";
        itr++;
    }
    cout<<endl<<endl;
}

Compile as below command

g++ -g -std=c++2a -I. h1.cpp -o h1 -luuid

Run ./h1