Compare two arrays for equality
#include <array.h>
int array_equal(array* x,array* y);
array x; array y; array_equal(&x,&y);
array_equal returns nonzero if x and y have the same contents: i.e.,
x and y are both unallocated; or
x is unallocated, y is allocated, and y has no initialized bytes; or
x is allocated, y is unallocated, and x has no initialized bytes; or
x and y are both allocated and have the same sequence of initialized bytes.
Otherwise it returns 0.