Using pointers in arrays with more than one dimension

Question

I know how to work pointers with a unidimensional array,(the identifier of the array points to its first element)..., but i would like to know how can i work the same with pointers but using arrays with more than one dimension?

You will need to give an example of what you want to do (there are lots of different ways to use pointers and multidimensional arrays). Also, try reading some of the "Related" questions in the list on the right -->. — Oliver Charlesworth, Sep 20 '11 at 13:26
Read here: http://stackoverflow.com/questions/4810664/how-do-i-use-arrays-in-c — Shahbaz, Sep 20 '11 at 13:28
@Oli - just saw that after i refreshed the page, oddly there werent any tag icons on the post while i was typing my answer :/ — totallyNotLizards, Sep 20 '11 at 13:32

score 1 · Answer 1 · answered Sep 20 '11 at 13:49

The same:

int a[10]; // array(10) of ints
int* pa = a; // pa points to first int
pa++; // pa points to second int

int b[10][20]; // array(10) of arrays(20) of ints
int (*pb)[20] = b; // pb points to first array(20) of ints
pb++; // pb points to second array(20) of ints

If you want to traverse 2-dimensionally, use manual indexing:

int tab[W][H];
int* p = &tab[x+y*W]; // element (x,y)
p += 1; // one element forward (x+1)
p += W; // one column forward (y+1)

Using pointers in arrays with more than one dimension

1 Answers1