Attempting to modify a constant pointer to non-constant data : const pointer « Pointer « C Tutorial

1.	Language
2.	Data Type
3.	String
4.	printf scanf
5.	Operator
6.	Statement
7.	Array
8.	Function
9.	Structure
10.	Pointer
11.	Memory
12.	Preprocessor
13.	File
14.	Data Structure
15.	Search Sort
16.	Wide Character String
17.	assert.h
18.	ctype.h
19.	math.h
20.	setjmp.h
21.	signal.h
22.	stdio.h
23.	stdlib.h
24.	string.h
25.	time.h
26.	wctype.h

C / ANSI-C

C++

C++ Tutorial

Visual C++ .NET

C Tutorial » Pointer » const pointer

10.9.1.Attempting to modify a constant pointer to non-constant data

ptr is a constant pointer to an integer that can be modified through ptr.
ptr always points to the same memory location.

#include <stdio.h>



int main()

{

   int x;

   int y;



   int * const ptr = &x; 



   *ptr = 7; /* allowed: *ptr is not const */

  // ptr = &y; /* error: ptr is const; cannot assign new address */



   return 0;



}

10.9.const pointer
	10.9.1.	Attempting to modify a constant pointer to non-constant data
	10.9.2.	Attempting to modify data through a non-constant pointer to constant data.
	10.9.3.	Using a non-constant pointer to non-constant data
	10.9.4.	A non-constant pointer to constant data

www.java2java.com | Contact Us

All other trademarks are property of their respective owners.