BV9112dDynArrNotes

#include <iostream>


int main()
{
    const int ySize{ 3 };
    const int xSize{ 3 };
    int arr2d[ySize][xSize]{ {1,2,3},{4,5,6},{7,8,9} };

    int arr[5]{ 1,2,3,4,5 };
    int* arrDyn{ new int[5] {1,2,3,4,5} };

    int** arr2dDyn{ new int* [ySize] };

    int* bigArr = new int[ySize * xSize]{18,28,38,48,58,68,78,88,98};

    for (int y{ 0 }; y < ySize; ++y)
    {
        arr2dDyn[y] = bigArr + (y * xSize);
    }

    //for (int y{ 0 }; y < ySize; ++y)
    //{
    //  arr2dDyn[y] = new int[xSize] {};
    //}

    //for (int y{ 0 }; y < ySize; ++y)
    //{
    //  delete[] arr2dDyn[y];
    //}




    for (int y{ 0 }; y < ySize; ++y)
    {
        for (int x{ 0 }; x < xSize; ++x)
        {
            std::cout << arr2dDyn[y][x] << ' ';
        }
        std::cout << '\n';
    }

    std::cout << '\n';


    delete[] bigArr;
    delete[] arr2dDyn;

    return 0;
    for (int x{ 0 }; x < xSize*ySize; ++x)
    {
        std::cout << *(((int*)arr2d) + x ) << ' ';
    }

    std::cout << '\n';

    //for (int x{ 0 }; x < 5; ++x)
    //{
    //  std::cout << *(arr + x) << ' ' << *(arrDyn +x)  << '\n';
    //}

//  int** arr2d = create2dArr<int>(ySize, xSize);
//  fill2dArr(arr2d, ySize, xSize);
//  print2dArr(arr2d, ySize, xSize);
//  std::cout << '\n';
//  deleteLine2dArr(arr2d, ySize,5);
//  std::cout << "New ySize is: " << ySize << "\n\n";
//  print2dArr(arr2d, ySize, xSize);
//  std::cout << '\n';
//  deleteLastLine2dArr(arr2d, ySize);
//  std::cout << "New ySize is: " << ySize << "\n\n";
//  print2dArr(arr2d, ySize, xSize);
//  std::cout << '\n';
//  deleteFirstLine2dArr(arr2d, ySize);
//  std::cout << "New ySize is: " << ySize << "\n\n";
//  print2dArr(arr2d, ySize, xSize);
//  std::cout << '\n';
//  delete2dArr(arr2d, ySize);
//
//  return 0;

    /*int ySize{ 10 };
    int xSize{ 8 };

    int** arr2d { new int* [ySize] };

    for (int y{ 0 }; y < ySize; ++y)
    {
        arr2d[y] = new int[xSize];
    }

    for (int y{ 0 }; y < ySize; ++y)
    {
        for (int x{ 0 }; x < xSize; ++x)
        {
            arr2d[y][x] = rand() % 10;
        }
    }

    for (int y{ 0 }; y < ySize; ++y)
    {
        for (int x{ 0 }; x < xSize; ++x)
        {
            std::cout << arr2d[y][x] << ' ';
        }
        std::cout << '\n';
    }
    std::cout << '\n';

    delete[] arr2d[ySize - 1];
    int** tmp = new int * [--ySize];
    for (int y{ 0 }; y < ySize; ++y)
    {
        tmp[y] = arr2d[y];
    }
    delete[] arr2d;
    arr2d = tmp;

    std::cout << "New ySize is: " << ySize << "\n\n";

    for (int y{ 0 }; y < ySize; ++y)
    {
        for (int x{ 0 }; x < xSize; ++x)
        {
            std::cout << arr2d[y][x] << ' ';
        }
        std::cout << '\n';
    }
    std::cout << '\n';

    for (int y{ 0 }; y < ySize; ++y)
    {
        delete[] arr2d[y];
    }
    delete[] arr2d;*/


    /*for (int y{ 0 }; y < ySize; ++y)
    {
        arr2dDyn[y] = new int[xSize];
    }*/

    //int arr2d[ySize][xSize]{ {12,23,34},{64,57,86} };

    //printArr((int*)arr2d, ySize * xSize);

    //return 0;

    //std::cout << (arr2dDyn[0] == nullptr) << '\n';
    //std::cout << (arr2dDyn[1] == nullptr) << '\n';
    //arr2dDyn[0] = new int[xSize] {1,2,3};
    //arr2dDyn[1] = new int[xSize] {4,5,6};

    //int* bigArr{ new int[ySize * xSize]{1,2,3,4,5,6} };

    //for (int y{ 0 }; y < ySize; ++y)
    //{
    //  for (int x{ 0 }; x < xSize; ++x)
    //  {
    //      arr2[y][x] = rand() % 10;
    //  }
    //  std::cout << '\n';
    //}

    //for (int y{ 0 }; y < ySize; ++y)
    //{
    //  for (int x{ 0 }; x < xSize; ++x)
    //  {
    //      std::cout << "Enter arr[" << y << "][" << x << "]\n";
    //      std::cin >> lineTo2dArr(bigArr, y, x, xSize);
    //  }
    //  std::cout << '\n';
    //}

    //for (int y{ 0 }; y < ySize; ++y)
    //{
    //  for (int x{ 0 }; x < xSize; ++x)
    //  {
    //      std::cout << lineTo2dArr(bigArr, y, x, xSize) << '\t';
    //  }
    //  std::cout << '\n';
    //}
    //for (int y{ 0 }; y < ySize; ++y)

    //{
    //  arr2dDyn[y] = bigArr + y * xSize;
    //}
    //printArr2dDyn(arr2dDyn, ySize, xSize);
    //delete[] arr2dDyn[0];
    //delete[] arr2dDyn[1];

    //delete[] bigArr;
    //for (int y{ 0 }; y < ySize; ++y)
    //{
    //  delete[] arr2dDyn[y];
    //}

    //delete[] arr2dDyn;

    ////int arr[xSize]{};
    //int* arrPtr{ new int[xSize] {1,2,3} };
    //
    //arrPtr[0] = 1;
    //arrPtr[1] = 2;
    //arrPtr[2] = 3;

    //*(arrPtr + 0) = 1;
    //*(arrPtr + 1) = 2;
    //*(arrPtr + 1) = 3;

    //delete[] arrPtr;
    //printArr2d(arr2d, ySize, xSize);

}