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Full Discussion: Pointer and address
Top Forums Programming Pointer and address Post 302803885 by yifangt on Tuesday 7th of May 2013 03:45:44 PM
Old 05-07-2013
pointer and address

Actually I did many similar test as you suggested, but I always got error message like:
Code:
program.c: In function ‘main':
program.c:7:3: warning: format ‘%c' expects argument of type ‘int', but argument 3 has type ‘char *' [-Wformat]

I think this is the point that I did not catch
Code:
argv [iCount] , The content  happens to be an address,

My confusion was also with a similar code I was trying:
Code:
1 #include<stdio.h>
  2 
  3 void Print(char *[]);
  4 void main()
  5 {
  6         char * pn[] = {"Fred", "Barney", "Betty", "Wilma", NULL};
  7         Print(pn);
  8 }
  9 void Print(char * arr[])
 10 {
 11         while (*arr != NULL) {
 12                 printf("arr %p \t %s\n", &arr, *arr);
 13                 arr++;
 14         }
 15 }

In this code line 12 was what I expected and printed out correct thing.
and the output is:
Code:
arr 0x7fffd4f3bb58      Fred
arr 0x7fffd4f3bb58      Barney
arr 0x7fffd4f3bb58      Betty
arr 0x7fffd4f3bb58      Wilma

Why this time in line 12 *arr was used instead of arr?
 

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PARSE_STR(3)								 1							      PARSE_STR(3)

parse_str - Parses the string into variables

SYNOPSIS
void parse_str (string $str, [array &$arr]) DESCRIPTION
Parses $str as if it were the query string passed via a URL and sets variables in the current scope. Note To get the current QUERY_STRING, you may use the variable $_SERVER['QUERY_STRING']. Also, you may want to read the section on vari- ables from external sources. Note The magic_quotes_gpc setting affects the output of this function, as parse_str(3) uses the same mechanism that PHP uses to populate the $_GET, $_POST, etc. variables. PARAMETERS
o $str - The input string. o $arr - If the second parameter $arr is present, variables are stored in this variable as array elements instead. RETURN VALUES
No value is returned. EXAMPLES
Example #1 Using parse_str(3) <?php $str = "first=value&arr[]=foo+bar&arr[]=baz"; parse_str($str); echo $first; // value echo $arr[0]; // foo bar echo $arr[1]; // baz parse_str($str, $output); echo $output['first']; // value echo $output['arr'][0]; // foo bar echo $output['arr'][1]; // baz ?> SEE ALSO
parse_url(3), pathinfo(3), http_build_query(3), get_magic_quotes_gpc(3), urldecode(3). PHP Documentation Group PARSE_STR(3)
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