>> If L=1 then a[b] == b[a].
>
> Uh, how do you figure? The memory locations of the two variables might
> be in no way related.

"a" is a pointer-to type, "b" is an integer type.

a[b] just means read the memory at location a+b. The "+" operator 
doesn't care which way round the variables are. Also thinking about it, 
this probably works for any array type, as the "+" operator knows how to 
add an integer to a pointer-to type in general (it multiplies the 
integer by the size of each array element first).

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