cpp-pointers


  Source:
  https://foxhop.net/f3aadc3e-2f95-11f1-98f8-e86a64d24d78/cpp-pointers
  Snapshot: 2026-10-16T08:39:44Z
  Generator: Remarkbox d747782

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cpp Pointers

if p is a pointer

&p

    the memory address of p

*p

    the content that p points to

p

    the content of p (or the address that p points to)

Dynamic memory allocation or alias

Useful but dangerous...

    int *p, *q; // create two pointers, named p and q

    p = new int; // 

    *p = 100;

    q = p;

    *q = 200;

    q = new int;

    *q = *p;

    delete p; // give memory that p occupied back to operating system

    p = NULL; // set p to memory address 0  

    delete q; // give memory that q occupied back to operating system

    q = NULL; // set q to memory address 0

Dynamic Allocation for arrays

    int size = 5;         // create an integer
    int *A;               // create an array of pointers

    A = new int[ size ];  // Ask for a certain size for your array

    A[0] = 10;            // Give values to Array
    A[1] = 20;
    A[2] = 30;
    A[3] = 40; 
    A[4] = 50; 

    //       8    32   32       36       40
    cout << &A << A << A + 0 << A + 1 << A + 2

    //       10      28      30
    cout << A[0] << A[1] << A[2] 

    //       10      10       28        30
    cout << *A << *A + 0 << A + 1 << * A + 2

    delete []A;
    A = NULL;

------------------------------------------------------------------------

Source:
https://foxhop.net/f3aadc3e-2f95-11f1-98f8-e86a64d24d78/cpp-pointers
Snapshot: 2026-10-16T08:39:44Z
Generator: Remarkbox d747782