cppCountEvenOddArr

#include <iostream>

void fillArr(int arr[], int arrSize, int begin, int end)
{
    for (int i{ 0 }; i < arrSize; ++i)
    {
        arr[i] = rand() % (end - begin) + begin;
    }
}

void printArr(int arr[], int arrSize)
{
    for (int i{ 0 }; i < arrSize; ++i)
    {
        std::cout << arr[i] << ' ';
    }

    std::cout << '\n';
}

bool isEven(int num)
{
    return num % 2 == 0;
}

bool isOdd(int num)
{
    return num % 2 != 0;
}

int countElements(int arr[], int arrSize, bool even = false)
{
    int count{ 0 };
    for (int i{ 0 }; i < arrSize; ++i)
    {
        if ((even and isEven(arr[i])) or (!even and isOdd(arr[i])) ) { ++count; }
    }
    return count;
}

int main()
{
    const int arrSize{ 10 };
    int arr[arrSize]{};

    std::cout << "Original arr content:\n";
    printArr(arr, arrSize);
    fillArr(arr, arrSize, 0, 10);
    std::cout << "Arr filled by random numbers:\n";
    printArr(arr, arrSize);
    std::cout << "There are " << countElements(arr, arrSize) << " elements\n";

    return 0;
}