On Mon, Aug 14, 2006 at 12:53:33PM -0400, Kerry Thompson wrote:
> void strcpy (char *s, char *t)
> {
> while (*s++ = *t++);
> }
>
> This copies a character from t to s, THEN increments s and t, THEN does the
> boolean comparison. It's one of the most elegant pieces of C code I know.
Are you sure the boolean comparison isn't done first, before the copy?
Someone new to C might wonder about that.
The above is also one of the more difficult for programmers new to C
(and even old hacks like me!) to understand at first glance. If I saw
this sort of thing in modern "production" code I wouldn't be very happy.
There is no harm in expanding it out to aid readability and debugging.
Any modern compiler should optimise both versions to the same object
code.
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