On using pointer to access elements of a 3D array

Question

I have an 3D array declared like this

unsigned char   ScalingList[3][2][64];

I need to access the elements of ScalingLists using another pointer, something on these lines

unsigned char (*pQM)[2][64];
pQM = &(ScalingList[0][0][0]);

and then index into the elements of ScalingList like this

pQM[i][j][k]

I know I need to have proper combination of (), * and &, but I'm not able to get it. Could someone please help me out..

@Avi Berger: you are right! Deleting against mis-understandings. — huseyin tugrul buyukisik
– huseyin tugrul buyukisik, Commented Aug 30, 2012 at 18:46

Avi Berger · Accepted Answer · 2012-08-30 19:08:03Z

2

What you posted looks pretty close to perfect to me. The only issue that I can spot is a type mismatch in the line:

pQM = &(ScalingList[0][0][0]);

The rhs as written is of type unsigned char *.

Try instead:

pQM = ScalingList;

The first dimension will decay to a pointer to the first element - a correctly sized 2-d array.

answered Aug 30, 2012 at 19:08

Avi Berger

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