Difference between const void * a and void * const a, and constvoid

Difference between const void * a and void * const a, and constvoid
Const void *

This defines a pointer a. a can point to any type of value, but it must point to a constant.

In this case, we cannot modify the object to which the pointer is directed, but we can point the pointer to another object.

For example:

Const void * a; * a = 0x123; // It cannot be compiled because * a contains a const value. The const value cannot be changed.

Const int m = 1; const int n = 2;

A = & m; a = & n; // compilation is successful.

 

Void * const

This defines a const pointer a. a can point to any type of value, but a is a constant pointer to an object.

We cannot modify the address stored in the pointer, but we can modify the object pointed to by the pointer.

For example:

Void * const a; this definition: * a = 0x123; no problem,

However, a = (void *) & B; is not acceptable because a is a const variable.

For example:

Int m = 1; nt n = 2;

A = & m; a = & n; // compilation fails.

 

In this case, const modifies * a in const void *. In void * const a, const modifies.