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| Newsgroups | comp.lang.c |
|---|---|
| Date | 2013-08-17 07:58 -0700 |
| References | (7 earlier) <kuligf$odv$1@dont-email.me> <9e9788fd-f433-4190-9cdf-cd77de48ce95@googlegroups.com> <kumve5$odv$2@dont-email.me> <cf16255e-047c-4940-9ff6-3d42d4377f32@googlegroups.com> <kuo1kf$5sk$1@dont-email.me> |
| Message-ID | <d87d7290-75b8-49b9-9c2e-2a5ece72bc4f@googlegroups.com> (permalink) |
| Subject | Re: size of |
| From | Malcolm McLean <malcolm.mclean5@btinternet.com> |
On Saturday, August 17, 2013 3:33:53 PM UTC+1, Stephen Sprunk wrote: > On 17-Aug-13 05:21, Malcolm McLean wrote: > > int is not guaranteed to be able to index more than 64kB of memory, > which is hardly sufficient for modern purposes. Even a 2GB limit > frequently causes problems these days. > int should be the natural integer size for the machine. This policy was followed as machines moved from 16 bit to 32 bit, and int became 32 bits. 16 bit machines still exist, but they demand convolutions to support objects bigger than 64K, if they support them at all, so it's reasonable to say that a special index type must be used if you're doing this. Unfortunately int often isn't 64 bits on a 64 bit machine. So it's a bit of a problem, because number of times you have more than 2 billion entities is quite small, but not small enough to be negligible. So usually we can use int i as a general-purpose index, but not always. Which causes problems when trying to write clean code.
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