Linux Format forums

Re: Integer i : "Using Loops" LXF158

einonm — Thu Jun 07, 2012 1:57 pm

Author: einonm

Posted: Thu Jun 07, 2012 1:57 pm

I never use i for variable names, have you ever tried doing a grep for 'i' to find out all the places it's used? You'll end up hitting every 'if' in the file for one thing.

As a consequence I always use 'ii' or 'jj' instead - much easier to search.

Re: Integer i : "Using Loops" LXF158

Bazza — Thu Jun 07, 2012 8:50 am

Author: Bazza

Posted: Thu Jun 07, 2012 8:50 am

Hey carl_h...

I always use n for a different reason - (n)umber...

(But yeah, with the speccy I was lazy too... ;o)

Re: Integer i : "Using Loops" LXF158

carl_h — Fri Jun 01, 2012 3:19 pm

Author: carl_h

Posted: Fri Jun 01, 2012 3:19 pm

Nuke wrote:

Graham Morrison wrote :- " the initial for statement requires a variable which for some reason is nearly always called i in examples"

When I learned to program on a ZX Spectrum, I always used n, because in Sinclair Basic, for loops ended with a 'Next' statement, and 'NEXT n' was just two presses on the N key.

Re: Integer i : "Using Loops" LXF158

Xelous — Mon Apr 30, 2012 4:27 pm

Author: Xelous

Posted: Mon Apr 30, 2012 4:27 pm

It was never important what i stood for, I've heard it called:

Its no important that it means anything, but that it is simple in the code to see what is implied by the programmer... and especially to make sure not to use j as the next value somewhere in the code...

At 3am on a coding kicker full of caffeine with the room all stuffy and the dog under the desk farting merrily, trying to decipher:

for (int i = 0; i < imax; i++) {
int jmax = i + 100;
for (int j = i; j < (jmax); j++) {

Is just horrible

Re: Integer i : "Using Loops" LXF158

towy71 — Thu Apr 26, 2012 8:38 pm

Author: towy71

Posted: Thu Apr 26, 2012 8:38 pm

i stands for interface as in gui

Re: Integer i : �Using loops� LXF158

Nuke — Thu Apr 26, 2012 7:10 pm

Author: Nuke

Posted: Thu Apr 26, 2012 7:10 pm

DavidMcCrossan wrote:

Dear Nuke, you are almost certainly old to been around when there appeared a memorable cartoon in the famous American satirical mag featuring a whimsical representation of a hippy with beard, flares, sandals and guitar been wheeled out of the Courtroom as he declaimed the message � a petty girl, a glass of wine and a charge of Statutory Rape...�

Maybe, but I was never quite a contemporary of Omah Khayyam,

http://www.kellscraft.com/rubaiyatedition1.html

Integer i : �Using loops� LXF158

DavidMcCrossan — Thu Apr 26, 2012 5:45 pm

Author: DavidMcCrossan

Posted: Thu Apr 26, 2012 5:45 pm

Dear Nuke, you are almost certainly old to been around when there appeared a memorable cartoon in the famous American satirical mag featuring a whimsical representation of a hippy with beard, flares, sandals and guitar been wheeled out of the Courtroom as he declaimed the message � a petty girl, a glass of wine and a charge of Statutory Rape...�

Best

David

Re: Integer i : "Using Loops" LXF158

nelz — Thu Apr 26, 2012 12:43 pm

Author: nelz

Posted: Thu Apr 26, 2012 12:43 pm

When I learned CS at uni, i stood for index.

That was Algol68, so a lot more modern than Fortran

Integer i : "Using Loops" LXF158

Nuke — Thu Apr 26, 2012 11:31 am

Author: Nuke

Posted: Thu Apr 26, 2012 11:31 am

Graham Morrison wrote :- " the initial for statement requires a variable which for some reason is nearly always called i in examples"

He is writing a bit tongue in cheek, but of course it stands for "integer".

More specifically the practice comes from Fortran, which was my first programming language. In IBM mainframe Fortran at least, all variables starting with letters between i and n were integers (geddit?) by default, and the rest were floating point. So many coders adopted this convention as a lifetime habit, and i is my own first choice for any counter.