Assigning an entire array with a single statement

Question

Let us say that I declare and initialize

int a[3] = {1, 2, 3};

How can I later asisgn the entire array in one fell swoop? i.e.

Answer 1

You cannot do that. An array can only be initialized from a brace expression in a declarator-initializer. You assign arrays.

In C89 there wasn't even such a thing as a "temporary array", though as of C99 these exist by virtue of compound literals (see @Dave's answer).