What is Constant Pointers [ Const Pointer ] in C Programming

What is Constant Pointers [ Const Pointer ] in C Programming :

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• As name suggests , Constant Pointers Cannot be modified . 
• Modification in Integer to which it Points to is Allowed
• Modification made in Pointer is Not Allowed

Syntax Declaration :

data_type * const Pointer_name ;

Live Example : 

           int i = 20;

           int * const ptr ;    // Declare Constant Pointer

           ptr = &i;

           *ptr = 20 ;          // Valid Statement

           ptr ++ ;              // Invalid Statement 

Explanation :

1. In the Diagram Shown The at 2001 we have Store the value 15 .
2. Constant Pointer is Pointer to that Variable [Pointer Stores address 2001]
3. We cannot Change the Address stored in Pointer Variable i.e 2001 is fixed
4. But we can Change the Value at 2001 i.e we can change value 15 to 20

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Tags / Keywords : | Const Pointer

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