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From: | David Jenkins <me AT jenkinsdavid DOT demon DOT co DOT uk> |
Newsgroups: | comp.os.msdos.djgpp |
Subject: | register int variable Is there any point??? |
Date: | Thu, 27 Feb 1997 02:56:07 +0000 |
Organization: | None |
Distribution: | world |
Message-ID: | <jXNX8DAHfPFzEwJ0@jenkinsdavid.demon.co.uk> |
References: | <ws6jCCAYMEFzEwZ0 AT jenkinsdavid DOT demon DOT co DOT uk> |
NNTP-Posting-Host: | jenkinsdavid.demon.co.uk |
MIME-Version: | 1.0 |
Lines: | 27 |
To: | djgpp AT delorie DOT com |
DJ-Gateway: | from newsgroup comp.os.msdos.djgpp |
In article <ws6jCCAYMEFzEwZ0 AT jenkinsdavid DOT demon DOT co DOT uk>, David Jenkins <me AT jenkinsdavid DOT demon DOT co DOT uk> writes > >So why doesn't DJGPP let me change an int variable to a register int >variable?? > Yes I was using the "d" variable as a global.This is were I was going wrong. I've been working through a tutorial using what programing knowledge I have from my basic days and applying them to a simple demo type program I'm using to apply newfound knowledge. Since I'm used to using globals most of the time in basic,I've been finding it hard to convert to the C methods.Which I now understand a little better. I used a simple rawclock()-timebefore_loop_was_started for timing a heavy loop using normal int variable in for(d=1 to 1000) and again using a register int in for(d=1 to 1000) the resulting time difference was almost unnoticable. Is there any point in using a register int in a for loop??? Or am I using a timing method which is incorrect?? -- David Jenkins
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