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Full Discussion: Pointers and array
Top Forums Programming Pointers and array Post 302853327 by yifangt on Friday 13th of September 2013 05:08:40 PM
Old 09-13-2013
Pointers and array
Hello, I read from a book exercise for a challenge. How to print out each letter of char array a[][][] by two different pointers pa and ppa in the example?
I have tried my code for letter "r" by testing without full understanding as only the first one worked.
Code:
#include<stdio.h>
int main()
{
    char a[4][3][2] = { {{'a', 'b'}, {'c', 'd',}, {'e', 'f'}},
                                   {{'g', 'h'}, {'i', 'j'}, {'k', 'l'}},
                                   {{'m', 'n'}, {'o', 'p'}, {'q', 'r'}},
                                   {{'s', 't'}, {'u', 'v'}, {'w', 'x'}}
                                 };

    char (*pa)[2] = &a[1][0];
    char (*ppa)[3][2] = &a[1];

//I tried out this one without much understanding.
    printf("The letter r can be reached by pointer *pa is: %c\n", pa[4][3]);
//No error at compiling time, but did not print out the letter r.
    printf("The letter r can be reached by pointer *ppa is: %c\n", ppa[4]);

    return 0;
}

Thank you in advance!
 

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LEARN ABOUT PHP

array_diff

ARRAY_DIFF(3)								 1							     ARRAY_DIFF(3)

array_diff - Computes the difference of arrays

SYNOPSIS

       array array_diff (array	$array1, array	$array2, [array  $...])

DESCRIPTION

	Compares $array1 against one or more other arrays and returns the values in $array1 that are not present in any of the other arrays.

PARAMETERS

	      o $array1
		- The array to compare from

	      o $array2
		- An array to compare against

	      o $...
		- More arrays to compare against

RETURN VALUES

	Returns an array containing all the entries from $array1 that are not present in any of the other arrays.

EXAMPLES

       Example #1

	      array_diff(3) example

	      <?php
	      $array1 = array("a" => "green", "red", "blue", "red");
	      $array2 = array("b" => "green", "yellow", "red");
	      $result = array_diff($array1, $array2);

	      print_r($result);
	      ?>

	       Multiple occurrences in $array1 are all treated the same way. This will output :

	      Array
	      (
		  [1] => blue
	      )

NOTES

       Note

	       Two  elements  are considered equal if and only if (string) $elem1 === (string) $elem2. In words: when the string representation is
	      the same.

       Note

	       This function only checks  one  dimension  of  a  n-dimensional	array.	Of  course  you  can  check  deeper  dimensions  by  using
	      array_diff($array1[0], $array2[0]);.

SEE ALSO

       array_diff_assoc(3), array_intersect(3), array_intersect_assoc(3).

PHP Documentation Group 													     ARRAY_DIFF(3)
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