I think that this rule applies to C89 too. I don't have an official copy of the standard, but I found a draft here: http://port70.net/~nsz/c/c89/c89-draft.html#

I think that this rule applies to C89 too. I don't have an official copy of the standard, but I found a draft here: http://port70.net/~nsz/c/c89/c89-draft.html#3.5.7 http://port70.net/~nsz/c/c89/c89-draft.html#3.5.7 “If there are fewer initializers in a list than there are members of an aggregate, the remainder of the aggregate shall be initialized implicitly the same as objects that have static storage duration.”