pointerLectureTranscript

#include "iostream"

void inc(int* ptr)
{
    std::cout << (*ptr)++ << '\n';
}

void swapVal(int a, int b)
{
    std::cout << "a = " << a << " b = " << b << '\n';
    int tmp{ a };
    a = b;
    b = tmp;
    std::cout << "a = " << a << " b = " << b << '\n';
}

void swapValPtr(int* a, int* b)
{
    std::cout << "a = " << *a << " b = " << *b << '\n';
    int tmp{ *a };
    *a = *b;
    *b = tmp;
    std::cout << "a = " << *a << " b = " << *b << '\n';
}

int* createArr(int size)
{
    //int arr[10];
    return new int[size];
}

void deleteArr(int* arr)
{
    delete[] arr;
}

void fillArr(int* ptr, int size, int start = 0, int stop = 10)
{
    for (auto elP{ ptr }; elP != (ptr + size); ++elP)
    {
        *elP = rand() % (stop - start + 1) + start;
    }
}

void printArr(int* ptr, int size)
{
    for (auto elP{ ptr }; elP != (ptr + size); ++elP)
    {
        std::cout << *elP << ' ';
    }
    std::cout << '\n';
}

int* foo(int* ptr)
{
    int val{ 333 };
    std::cout << *ptr << '\n'; // 333
    return ptr;
}

void boo()
{
    int arr[1000]{};
    for (int i{ 0 }; i < 1000; arr[i] = i++);
}

int main()
{

    int* ptr{new int[10]{ 1,2,3,4,5,6,7,8,9,10 }};
    int* delPtr = ptr;
    for (int i{ 0 }; i < 10; std::cout << *(ptr++) << ' ', ++i);

    delete[] delPtr;

    //int size{ 0 };
    //std::cout << "Enter size\n";
    //std::cin >> size;

    //int* ptr{ createArr(size) };
    //fillArr(ptr, size, 10,20);
    //printArr(ptr, size);
    //deleteArr(ptr);

    //int arr[5]; int* const arr = new int[5];
    //fillArr(arr, 5, 100, 150);
    //printArr(arr, 5);

    /*int* ptr{ new int{42} };
    std::cout << ptr << '\n';
    std::cout << *ptr << '\n';
    *ptr = 56;
    std::cout << *ptr << '\n';

    delete ptr;

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

    int size{ 0 };
    std::cout << "Enter size\n";
    std::cin >> size;

    ptr = new int[size]{ 1,2,3,4,5 };
    for (int i{ 0 }; i < size; std::cout << ptr[i++] << ' ');
    delete[] ptr;

    std::cout << "Enter size\n";
    std::cin >> size;

    ptr = new int[size] { 10, 20, 30, 40, 50 };
    for (int i{ 0 }; i < size; std::cout << ptr[i++] << ' ');
    delete[] ptr;

    double* ptrF{ new double{42.4} };
    delete[] ptrF;*/


    //std::cout << *ptrX << '\n';



    //const int* ptrArr[5];

    //for (int i{ 0 }; i < 5; *(ptrArr + i) = arr + i++);
    //for (int i{ 0 }; i < 5; std::cout << *(ptrArr + i++) << '\n');
    //std::cout << "##################\n";
    //for (int i{ 0 }; i < 5; ptrArr[i] = arr + i++);
    //for (int i{ 0 }; i < 5; std::cout << **(ptrArr + i++) << '\n');
    //for (int i{ 0 }; i < 5; std::cout << **(ptrArr + i++) << '\n');

    //*ptrArr[0] = 23; arr[i] <=> *(arr + i)



    //const int c{ 42 };
    //const int z{ 345 };
    //int x{ 33 };
    //int y{ 66 };

    //const int* ptrC{ &c };
    //int* const ptrX{ &x };
    //*ptrX = 99;
    //std::cout << *ptrX << '\n';
    //const int* const zhest{ &x };

    //std::cout << *ptrC << '\n';
    //ptrC = &z;
    //std::cout << *ptrC << '\n';



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

    printArr(arr, 5);

    int* tmpArr{ new int[10]{} };

    for (int i{ 0 }; i < 5; ++i)
    {
        tmpArr[i] = arr[i];
    }

    delete[] arr;
    arr = tmpArr;

    printArr(arr, 10);

    tmpArr = new int[4]{};

    for (int i{ 0 }; i <4; ++i)
    {
        tmpArr[i] = arr[i];
    }
    delete[] arr;
    arr = tmpArr;
    printArr(arr, 4);*/

    //int x{ 256 };
    //int* ptr = foo(&x);

    //std::cout << *ptr << '\n'; // 333
    //boo();
    //std::cout << *ptr << '\n'; // ????


    //int size{ 0 };
    //std::cout << "Enter size \n";
    //std::cin >> size;
    //int arr[10]{};

    //int* ptr = createArr(size);
    //fillArr(ptr, size);
    //printArr(ptr, size);
    //deleteArr(ptr);

    //fillArr(arr, 10);
    //printArr(arr, 10);

    //int x{ 42 };
    //int y{ 68 };

    //std::cout << "x = " << x << " y = " << y << '\n';
    //swapValPtr(&x, &y);
    //std::cout << "x = " << x << " y = " << y << '\n';

    //inc(&x);//
    //inc(&x);//
    //std::cout << x << '\n';//

    //int* ptrI{ nullptr };

    //int size{ 0 };
    //std::cout << "Enter size \n";
    //std::cin >> size;

    //ptrI = new int[size]{};


    //for (auto elP{ ptrI }; elP != (ptrI + 1000); ++elP)
    //{
    //  *elP = rand() % 10;
    //  std::cout << *elP << ' ';
    //}
    //std::cout << '\n';

    //delete[] ptrI;
}