When I run this program on ActivePerl 5.8 on Windows XP, I get a syntax error:
#!C:\Perl\bin\perl.exe
use strict; # enabled
use warnings;
(my $rocks[0], my $rocks[1]) = qw/Hello World/; # Syntax error near '$rocks['
my $rocks[2] = 'Tom'; # Syntax error near '$rocks['
my $rocks[3] = 'Cat'; # Syntax error near '$rocks['
print $rocks[0];
print $rocks[1];
print $rocks[2];
print $rocks[3];
When I used ( @
) before the name of the array rocks
, it worked well. How do I fix the error above when I used $
? Thank you.
my @rocks = qw{Hello World Tom Cat}; # worked well.
Don't use my
again and again to declare $rocks[0]
, $rocks[1]
etc. Declare the array once ( @rocks
) and use it.
The corrected code is something like this:
use strict;
use warnings;
my @rocks; ## declare the array here
($rocks[0], $rocks[1]) = qw/Hello World/;
$rocks[2] = 'Tom';
$rocks[3] = 'Cat';
Use the push
operator:
my @rocks;
push @rocks, qw/ Hello World /;
push @rocks, "Tom";
push @rocks, "Cat";
Avoiding explicit and redundant array indices helps future-proof your code. For example, if you find you need to change your initialization, you can't botch an array index that isn't there.
I think you need to declare my @rocks
and then not use my
any more when referring to $rocks[xxx]
.
If you don't know how many elements are going to be in there, you can use push
to add new elements into the (initially 0-sized) array.
You are redeclaring @rocks
several times. Try something like this instead:
my @rocks;
$rocks[0] = 'Tom';
$rocks[1] = 'Cat';
etc.
You can first declare the array at the top as:
my @rocks;
And remove my declaration from all other places.
Your code becomes:
#!C:\Perl\bin\perl.exe
# ActivePerl 5.8 based
use strict; # enabled
use warnings;
my @rocks;
($rocks[0], $rocks[1]) = qw/Hello World/; # Syntax error near '$rocks['
$rocks[2] = 'Tom'; # Syntax error near '$rocks['
$rocks[3] = 'Cat'; # Syntax error near '$rocks['
print $rocks[0];
print $rocks[1];
print $rocks[2];
print $rocks[3];
Why don't you just put it straight into @rocks
?
use strict;
use warnings;
my $rocks[2] = 'Tom';
my $rocks[3] = 'Cat';
print $rocks[0];
print $rocks[1];
print $rocks[2];
print $rocks[3];
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.