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Re: Re: Of variable {mice} and its name {man}.

by rinceWind (Monsignor)
on Jun 02, 2002 at 13:24 UTC ( #171020=note: print w/replies, xml ) Need Help??


in reply to Re: Of variable {mice} and its name {man}.
in thread Of variable {mice} and its name {man}.

hsmyers, do you have a FORTRAN background by any chance?

For the benefit of others on this forum, FORTRAN is like Basic and no strict, in that you do not have to declare variables. However, variables beginning [I-M] are automatically declared integer, whereas ones beginning with the other letters of the alphabet are automatically real.

This I believe is where your i,j,k and m,n come from. As for s and t, strings were a latecomer to FORTRAN.

Back to the subject of perl, my beliefs are that it should be obvious from looking at the code what your variable is. I don't have an issue with single char loop variables (apart from $a and $b of course), but generally, variables should be given meaningful names. Also, I like using underscores, as I have done much programming in languages and on operating systems without case sensitivity. I have been bitten may times writing code with variables $fooBar, $FooBar and $foobar, whereas $foo_bar wins every time for me.

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Re: Re: Re: Of variable {mice} and its name {man}.
by Steve_p (Priest) on Jun 07, 2002 at 11:41 UTC
    My first experiences with i,j,and k were in Vector Calculus, not in programming. In a three dimensional space, i relates to the X, j relates to Y, and k relates to Z. I don't know if this was just my textbook's standard, or if others followed this as well.

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[Eily]: if so, most subs start with my (VARIABLES) = @_ anyway
[moritz]: for short subs, I sometimes let them work on $_[0] directly
[Eily]: moritz but that should be fine unless you modify them
[choroba]: if you modify them, Perl will crash with "Modification of a read-only value attempted" for $1
[choroba]: I can't replicate the situation, but I remember it was very hard to debug

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