Date sent: Thu, 10 Jul 2003 14:03:32 -0700 (PDT)
From: Hari Krishnaan <[EMAIL PROTECTED]>
Subject: Question on For loop usage in Perl
To: [EMAIL PROTECTED]
> Hello all,
> I was using a for loop in the following manner in one of my perl
> programs.
>
> for($j=31, $n=$initial;$j>=0,$n<=$final;$j--,$n++) {
>
> # Executing statements here
> }
>
> 1) Is it legal in perl to use the for loop as mentioned above ?
Well ... it compiles.
> 2) If so when i compile perl gives a message as follows
> :
> "Useless use of integer ge (>=) in void context"
>
> What does this message mean ? Is this an error message or a warning
> message ?
it's a warning. But a warning you should care about.
It says that you test whether $j is greater or equal to zero ... but
you do not use the result of that test in any way. Your code is
exactly equivalent to:
for($j=31, $n=$initial;$n<=$final;$j--,$n++) {
In this case I believe you wanted this:
for($j=31, $n=$initial;$j>=0 and $n<=$final;$j--,$n++) {
HTH, Jenda
===== [EMAIL PROTECTED] === http://Jenda.Krynicky.cz =====
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