cla@isis.cs.du.edu (Chuck Anderson) (03/20/91)
You can do a nice string copy with this construct as well:
(dest is a char array and source is a valid C string)
while (*dest++ = *source++);
--
*************************************************************************
Chuck Anderson uucp : uunet!isis!cla
Boulder, Co. (303) 494-6278 internet: cla@isis.cs.du.edu
*************************************************************************torek@elf.ee.lbl.gov (Chris Torek) (03/21/91)
In article <1991Mar20.031419.3677@isis.cs.du.edu> cla@isis.UUCP (Chuck Anderson) writes: >You can do a nice string copy with this construct as well: > while (*dest++ = *source++); Of course, you can also write it as: while ((*dest++ = *source++) != 0) /* or != '\0' */ /* void */; which will leave no doubt in the reader's mind that you meant `test the result of copying one element', and not `test one pair of elements'. Commenting the empty statement (here, with `void', though `do nothing' or `continue' or `skip' or ... are all fine) will also remove all doubt as to whether it, too, was unintended. -- In-Real-Life: Chris Torek, Lawrence Berkeley Lab CSE/EE (+1 415 486 5427) Berkeley, CA Domain: torek@ee.lbl.gov
sven@cs.widener.edu (Sven Heinicke) (03/21/91)
In <11195@dog.ee.lbl.gov>, torek@elf.ee.lbl.gov writes: >In article <1991Mar20.031419.3677@isis.cs.du.edu> >cla@isis.UUCP (Chuck Anderson) writes: >>You can do a nice string copy with this construct as well: >> while (*dest++ = *source++); When I read something like this I automaticely think not equal to zero. > >Of course, you can also write it as: > > while ((*dest++ = *source++) != 0) /* or != '\0' */ > /* void */; > And when I am typing c code, rather often my thincking goes much faster then my typing, especialy with the the five kinds of key boards I normally use (IBM PC, VT101, VT330, sunwork station and macintosh) and all of those symbols slow me down. If I can pal to go through my program ofterwords I sometime put in the != 0 but only in cases that get rather complicated arguments in c. -- sven@cs.widener.edu Widener CS system manager Sven Mike Heinicke and Student (pssmheinicke@cyber.widener.edu (if you must))