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4.
char abc[120][80];

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Rewrite it with all parentheses explicitly shown:
char ((abc[120])[80]);
and read it from the inside out:

1. abc is being declared,
2. it is an array of 120 things,
3. each of them is an array of 80 other things,
4. they are characters.

So abc is a two dimensional (120x80) array of characters.
         or
abc is an array of 120 80-character strings.
         but
abc can not be treated as an array of 80 120-character strings.

Important Note
         This is not the same thing as:
char *abc[120];
In a way, they are both arrays of 120 strings, but the version we are looking at really allocates all the memory for all the strings; they are fixed at 80 characters each. The other version (with the *) is really just an array of pointers to strings. The strings themselves do not exist yet; the programmer will have to make the pointers point to something useful before they can be used.

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(sizeof abc) is 9600 (that is 120*80).
(sizeof abc[2]) is 80.
(sizeof abc[2][71]) is 1.

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