Newsgroups: comp.lang.c
Path: utzoo!henry
From: henry@utzoo.uucp (Henry Spencer)
Subject: Re: Array indexing vs. pointers...
Message-ID: <1988Oct5.204711.12099@utzoo.uucp>
Organization: U of Toronto Zoology
References: <836@proxftl.UUCP> <3105@hubcap.UUCP> <1700@dataio.Data-IO.COM>
Date: Wed, 5 Oct 88 20:47:11 GMT

In article <1700@dataio.Data-IO.COM> bright@dataio.Data-IO.COM (Walter Bright) writes:
>    o	Replace int variables with unsigned where possible. This tells the
>	optimizer that the variable can never be negative...

This can be a mistake on some machines, and I'm not sure how it would help
very often.

>    o	... Use calloc instead of
>	malloc followed by zeroing each member.

Mistake -- the semantics are not the same.  Calloc fills with zero bits;
that is not necessarily the same thing as zero values, especially for
floating-point and pointers.
-- 
The meek can have the Earth;    |    Henry Spencer at U of Toronto Zoology
the rest of us have other plans.|uunet!attcan!utzoo!henry henry@zoo.toronto.edu