C 2D arrays

[jgroch]

I'm trying to learn C and I'm a little embarrassed to ask, but I've spent more time trying to find an answer than I think should be necessary without finding out why, so I'll ask.

Why does the following create a segmentation fault when run?

int main() {
	int a[1000000][1000000];
	a[0][0] = 0;
}

As I understand it, seg faults mean I'm trying to access areas of memory that I shouldn't. So I'm guessing I'm not initializing an array properly. Or is it something to do with dimensions being to large?

Any help would be appreciated.