[prog] [C] strings bug

[Meredydd Luff]

Robert J. Hansen said:
>> When this function is called, the values of string1, string2, and
>> string3 are  undefined - they could technically be anything. Looking
>> at your output,
>
> According to C++98, globals are initialized to a value of 0 (NULL for
> pointers, 0.0 for doubles/floats) before main() is entered.  I believe
> C89 is the same way, but I wasn't able to find a definitive reference
> in a thirty-second check of K&R.
Well, I have less exalted sources to refer to, but I remember being taught
that with C++, unlike C, uninitialised variables were initialised to zero
by default, but that it was still bad style to rely on that feature.
Indeed, I prefer Java's attitude - "this variable may be used unassigned"
is a build-stopping error. If you're going to use a variable initialised
to zero, fine, but do it explicitly.
Meredydd
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