May I treat a 2D array as a contiguous 1D array?

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It’s up to interpretation. While the contiguity requirements of arrays don’t leave much to the imagination in terms of how to layout a multidimensional arrays (this has been pointed out before), notice that when you’re doing p[1234] you’re indexing the 1234th element of the zeroth row of only 80 columns. Some interpret the only valid indices to be 0..79 (&p[80] being a special case).

Information from the C FAQ which is the collected wisdom of Usenet on matters relevant to C. (I do not think C and C++ differ on that matter and that this is very much relevant.)

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