BR012arrBasics

#include <iostream>
#include <chrono>

//(?)(1)(2)(3)(4)(5)(?)()()()(?)
//[-1][0][1][2][3][4][10]

int main()
{
    int num{5};

    const int badSize{ num };

    const int arrSize{ 10 };

    int arr[arrSize]{1,2,3,4,5,6,7,8,9,10};

    int sum{ 0 };

    /*for (int i{ 0 }; i < arrSize; ++i)
    {
        std::cout << "Enter " << i + 1 << " element of arr\n";
        std::cin >> arr[i];
    }*/

    //0 .. MAX_RAND 32767

    //n % 3 -> [0 .. 1]
    //n % m -> [0 .. m-1]
    //n % 11 -> [0..10]
    /*srand(time(0));

    int start{ 10 };
    int stop{ 20 };

    (start + (rand() % (start - stop + 1)))*/

    /*int start{ 10 };
    int stop{ 20 };

    for (int i{ 0 }; i < arrSize; ++i)
    {
        arr[i] = start + (rand() % (start - stop + 1));
    }*/

    /*int a = 10;
    int b = 20;
    int tmp;

    tmp = a;
    a = b;
    b = tmp;*/






    for (int i{ 0}; i < arrSize; ++i) { std::cout << arr[i] << ' '; } std::cout << '\n';

    // [1][2][3][4][5][6][7][8][9][10]
    // [10][9][8][7][6][5][4][3][2][1]

    // [][][][][][][][][][]
    for (int head{ 0 }, tail{ arrSize - 1 }, tmp{0}; head < tail; ++head, --tail)
    {
        tmp = arr[head];
        arr[head] = arr[tail];
        arr[tail] = tmp;
    }
    std::cout << '\n';

    for (int i{ 0 }; i < arrSize; ++i) { std::cout << arr[i] << ' '; } std::cout << '\n';

    return 0;
}