Categories:
.NET (357)
C (330)
C++ (183)
CSS (84)
DBA (2)
General (7)
HTML (4)
Java (574)
JavaScript (106)
JSP (66)
Oracle (114)
Perl (46)
Perl (1)
PHP (1)
PL/SQL (1)
RSS (51)
Software QA (13)
SQL Server (1)
Windows (1)
XHTML (173)
Other Resources:
I im trying to declare a pointer and allocate some space for it
I'm trying to declare a pointer and allocate some space for it, but it's not working. What's wrong with this code?
char *p;
*p = malloc(10);
✍: Guest
The pointer you declared is p, not *p. When you're manipulating the pointer itself (for example when you're setting it to make it point somewhere), you just use the name of the pointer:
p = malloc(10);
It's when you're manipulating the pointed-to memory that you use * as an indirection operator:
*p = 'H';
(It's easy to make the mistake shown in the question, though, because if you had used the malloc call as an initializer in the declaration of a local variable, it would have looked like this:
char *p = malloc(10);
When you break an initialized pointer declaration up into a declaration and a later assignment, you have to remember to remove the *.)
In summary, in an expression, p is the pointer and *p is what it points to (a char, in this example).
2016-06-10, 2074👍, 0💬
Popular Posts:
What Is C Language? The C programming language is a standardized programming language developed in t...
How To Write a Minimum Atom 1.0 Feed File? - RSS FAQs - Atom Feed Introduction and File Generation I...
How To Create an Add-to-Bloglines Button on Your Website? - RSS FAQs - Adding Your Feeds to RSS News...
How do you target a specific frame from a hyperlink? Include the name of the frame in the target att...
How To Add Column Headers to a Table? - XHTML 1.0 Tutorials - Understanding Tables and Table Cells I...