cppPointersBasics

#include <iostream>



int main()
{
    int num{ 42 }; //4
    int num1{ 33 };

    float val{ 42 }; // 4

    bool flag{}; // 1

    uint16_t word{ 1005 }; // 2

    double temp{ 36.675 };

    std::cout << "num is living at " << &num << " address\n";
    std::cout << "val is living at " << &val << " address\n";
    std::cout << "flag is living at " << &flag << " address\n";

    int address{ (int)&num };

    std::cout << " address = " << address << '\n';


    int* ptrNum{ &num }; //4
    float* ptrVal{ &val }; //4
    bool* ptrFlag{&flag}; //4
    uint16_t* ptrWord{ &word }; //4
    double* ptrTemp{ &temp };

    std::cout << "Size of ptrNum variable is " << sizeof(ptrNum) << '\n';
    std::cout << "Size of ptrVal variable is " << sizeof(ptrVal) << '\n';
    std::cout << "Size of ptrFlag variable is " << sizeof(ptrFlag) << '\n';
    std::cout << "Size of ptrWord variable is " << sizeof(ptrWord) << '\n';
    std::cout << "Size of ptrTemp variable is " << sizeof(ptrTemp) << '\n';


    std::cout << "ptrNum = " << ptrNum << '\n';
    std::cout << "ptrVal = " << ptrVal << '\n';
    std::cout << "ptrFlag = " << ptrFlag << '\n';

    //ptrNum = &num1;

    std::cout << "*ptrNum = " << *ptrNum << '\n';
    std::cout << "*ptrVal = " << *ptrVal << '\n';
    std::cout << "*ptrFlag = " << *ptrFlag << '\n';

    *ptrNum = 76;
    num = 333;
    std::cout << num << '\n';


    *ptrVal = 76;
    *ptrFlag = true;

    std::cout << "*ptrNum = " << *ptrNum << '\n';
    std::cout << "*ptrVal = " << *ptrVal << '\n';
    std::cout << "*ptrFlag = " << *ptrFlag << '\n';

    std::cout << "num = " << num << '\n';
    std::cout << "val = " << val << '\n';
    std::cout << "flag = " << flag << '\n';


    ptrNum = (int*)&val;
    ptrVal = (float*)&num;

    std::cout << "*ptrNum = " << *ptrNum << '\n';
    std::cout << "*ptrVal = " << *ptrVal << '\n';

    const int arrSize{ 10 };
    int arr[arrSize]{ 1,2,3,4,5,6,7,8,9,10 };
    int* begin{ arr };
    int* end{ arr + arrSize };


    while (begin != end)
    {
        std::cout << *begin++ << ' ';
    }
    std::cout << '\n';

    int size;

    std::cout << "Enter array size:\n";
    std::cin >> size;
    int* ptr{ new int[size] {1,2,3,4,5,6,7,8,9,10,11,12} };
    begin = ptr;
    end = ptr + size;

    while (begin != end)
    {
        std::cout << *begin++ << ' ';
    }
    std::cout << '\n';


    delete[] ptr;

    return 0;
}