How to declare 2D array?

1

I have two questions about arrays.

1) I created an array with [][] and passed it into a function expecting **. I got an error saying: *cannot convert parameter 1 from ‘gfx::Vec3f [800][600]’ to 'gfx::Vec3f ***. I thought [][] and ** are the same thing!

2) I tried doing “Vec3f image[width][height];” before, but the compiler complained saying “expected constant expression”. So I changed it to “Vec3f image[800][600];” to make it compile. Why must I do this hardcoding?


Pixels::Pixels(Vec3f** colors, int width, int height)
{
	this->width = width;
	this->height = height;
	this->image = colors;
}



int width = 800;
int height = 600;

Vec3f image[800][600];

for(int w = 0; w < width; w++)
	for(int h = 0; h < height; h++)
		image[w][h] = Vec3f(w / width, h / height, w / height); 

Pixels pixels = new Pixels(image, width, height);