Thread: Help with 2d array of structures and pointers.

Hello everyone. I need a little help with my assignment trying to get pointers to reference a 2d array of structures.

Here's the original code:

Code:

//this is global
struct structFractal{
    uchar R, G, B;
} fractal[ySize][xSize];

A function goes through a bunch of for loops to generate the fractal:

Code:

            fractal[y][x].R = LUT[color].R;
            fractal[y][x].G = LUT[color].G;
            fractal[y][x].B = LUT[color].B;

It compiles and works fine with this, but i like i said i have to change it so it uses pointers to reference the arrays... I'm lost.

I'm think i got it actually. This is what I ended up with:

Code:

//global
struct structFractal{
    uchar R, G, B;
} fractal[ySize][xSize];

...

Code:

//code in function
struct structFractal *ptrFractal;
ptrFractal = &fractal[0][0];
//For loops...
       (ptrFractal + y * ySize + x)->R  = LUT[color].R;
       (ptrFractal + y * ySize + x)->G = LUT[color].G;
       (ptrFractal + y * ySize + x)->B = LUT[color].B;

How's it look?