Explain pointer to the constant and constant pointer ?

Total Post:157

Points:785
 2076  View(s)
Ratings:
Rate this:
  1. Post:157

    Points:785
    Explain pointer to the constant and constant pointer ?

    Pointer to constant does not allow to change the value at the address pointed by pointer ( *ptr).

    1. const int *ptr = 3;
    2. int const *ptr; // 1 and 2 both are having same meaning.

    *ptr = 5; // not allowed

    Constant pointer does not allow to change the address to which pointer is pointing.
    int i = 10;
    int * const ptr = &i;
    int j =80;

    ptr = &j; // not allowed.


    constant pointer to constant data
    int i = 9;
    const int * const ptr = &i;
    int j =90;

    *ptr =10; // not allowed
    ptr = &j; // not allowed.


Answer