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From: lerman@stpstn.UUCP (Ken Lerman)
Newsgroups: comp.lang.c
Subject: Re: a style question
Message-ID: <5636@stpstn.UUCP>
Date: 2 Oct 90 13:41:53 GMT
References: <7341@darkstar.ucsc.edu> <8660@ncar.ucar.edu> <1990Sep30.220839.20183@nntp-server.caltech.edu> <1990Oct1.174625.22061@zoo.toronto.edu>
Reply-To: lerman@stpstn.UUCP (Ken Lerman)
Organization: The Stepstone Corporation, Sandy Hook, CT 06482
Lines: 25

In article <1990Oct1.174625.22061@zoo.toronto.edu> henry@zoo.toronto.edu (Henry Spencer) writes:
->In article <1990Sep30.220839.20183@nntp-server.caltech.edu> manning@nntp-server.caltech.edu (Evan Marshall Manning) writes:
->>Don't ever use single-character variable names.  I use 'ix' for
->>loop index variables for which I can come up with no better name...
->
->In what way is "ix" superior to "i"?  Both are meaningless names in
->this context.  If the name is not going to be meaningful -- and in the
->context of a short loop, it's not clear that making it meaningful is
->either possible or particularly important -- then at least keep it short.
->
->There is an old prejudice against using "I" or "O" for a variable name,
->arising from confusion with "1" and "0", but the lowercase letters don't
->have that problem.
->-- 
->Imagine life with OS/360 the standard  | Henry Spencer at U of Toronto Zoology
->operating system.  Now think about X.  |  henry@zoo.toronto.edu   utzoo!henry

I think I first saw this in one of Jerry Weinberg's books.  Don't use
two variable names which differ in only a single character.  That way
a one key typo won't hurt you.  If you use a lot of single character
variable names, one miskey and you have a syntactically valid program
which does the wrong thing.  Of course, using ix and iy has the same
problem.  Are "row" and "column" better variable names?  Probably, but x and y are more convenient. :-) Do what I say, not what I do. :-)

Ken