[pcwalton]

The first example program that demonstrates arrays in The C Programming Language 2nd edition (page 22) uses signed integers for both the induction variable and the array length (the literal 10 becomes int).

[frumplestlatz]

The language has evolved significantly, and we’ve learned a lot about how to write safer C, since that was published in 1988.

[Maxatar]

From what I see, that book was published in 1988.