twoArrCopy

#include <iostream>

int main()
{
    const int bigSize{ 10 };
    const int smallSize{ bigSize / 2 };

    int bigArr[bigSize];
    int smallA[smallSize];
    int smallB[smallSize];

    for (int method{ 2 }; method; --method) //2 - A, 1 - B
    {
        // fill and output bigArr
        std::cout << "bigArr: ";
        for (int bigIdx{ 0 }; bigIdx < bigSize; ++bigIdx)
        {
            bigArr[bigIdx] = rand() % 10;
            std::cout << bigArr[bigIdx] << ' ';
        }
        std::cout << '\n';

        // copy from bigArr to two smallA and smallB array
        // there are two methods to copy - A and B
        if (method == 2)
        {
            // method A
            for (int smallIdx{ 0 }; smallIdx < bigSize; ++smallIdx)
            {

                (smallIdx < smallSize ? smallA[smallIdx] : smallB[smallIdx - smallSize]) = bigArr[smallIdx];
            }

        }
        else
        {
            // method B
            for (int smallIdx{ 0 }; smallIdx < smallSize; ++smallIdx)
            {
                smallA[smallIdx] = bigArr[smallIdx];
                smallB[smallIdx] = bigArr[smallSize + smallIdx];
            }
        }

        std::cout << "smallA: ";
        for (int smallIdx{ 0 }; smallIdx < smallSize; ++smallIdx)
        {
            std::cout << smallA[smallIdx] << ' ';
        }
        std::cout << '\n';

        std::cout << "smallB: ";
        for (int smallIdx{ 0 }; smallIdx < smallSize; ++smallIdx)
        {
            std::cout << smallB[smallIdx] << ' ';
        }
        std::cout << '\n';

    }

    return 0;
}