pointer.cpp

#include <iostream>
using namespace std;

int main()
{
    int x = 10;
    // & returns the memory address of that variable.
    cout << &x << endl;

    // When used in a variable declaration, * denotes a pointer variable. For example:
    int *xptr = &x;
    // xptr now contains the address of x

    cout << xptr << endl;

    // To access the value of x, it uses the dereference operator
    cout << *xptr << endl;

    int y = 10;
    int &z = y;

    cout << &y << endl;
    cout << &z << endl;

    // z is a reference variable; y and z share the same memory address. Changing either of them changes both of them.

    int value = 42;
    int *ptrToValue = &value;
    int **ptrToPtr = &ptrToValue; // Pointer to a pointer

    cout << &value << endl;     // Memory address of value
    cout << ptrToValue << endl; // Memory address stored in ptrToValue (same as &value)
    cout << *ptrToPtr << endl;  // Value of ptrToValue (points to value)
    cout << **ptrToPtr << endl; // Value of valuerm
    return 0;
    
    #include <iostream>
using namespace std;

int main()
{
    int x = 10;
    // & returns the memory address of that variable.
    cout << &x << endl;

    // When used in a variable declaration, * denotes a pointer variable. For example:
    int *xptr = &x;
    // xptr now contains the address of x

    cout << xptr << endl;

    // To access the value of x, it uses the dereference operator
    cout << *xptr << endl;

    int y = 10;
    int &z = y;

    cout << &y << endl;
    cout << &z << endl;

    // z is a reference variable; y and z share the same memory address. Changing either of them changes both of them.

    int value = 42;
    int *ptrToValue = &value;
    int **ptrToPtr = &ptrToValue; // Pointer to a pointer

    cout << &value << endl;     // Memory address of value
    cout << ptrToValue << endl; // Memory address stored in ptrToValue (same as &value)
    cout << *ptrToPtr << endl;  // Value of ptrToValue (points to value)
    cout << **ptrToPtr << endl
         << endl; // Value of valuerm

    int arr[5] = {1, 2, 3, 4, 5};
    int *arrPtr = arr; // Pointer to the first element of the array

    cout << arr << endl;    // Memory address of the array (same as &arr[0])
    cout << arrPtr << endl; // Memory address stored in arrPtr (same as &arr[0])
    cout << arrPtr << endl << endl; // Memory address stored in arrPtr (same as &arr[0])

    // Using a pointer to iterate through the array
    for (int i = 0; i < 5; i++)
    {
        cout << *(arrPtr + i) << " "; // Dereference arrPtr to access elements
    }
    cout << endl;
    return 0;
}

}