Since array references decay into pointers, if arr is an array, what's the difference between arr and &arr?
The type.
In Standard C, &arr yields a pointer, of type pointer-to-array-of-T, to the entire array. (In pre-ANSI C, the & in &arr generally elicited a warning, and was generally ignored.) Under all C compilers, a simple reference (without an explicit &) to an array yields a pointer, of type pointer-to-T, to the array's first element. (See also questions 6.3, 6.13, and 6.18.)
References:
ANSI Sec. 3.2.2.1, Sec. 3.3.3.2
ISO Sec. 6.2.2.1, Sec. 6.3.3.2
Rationale Sec. 3.3.3.2
H&S Sec. 7.5.6 p. 198
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