warning in Push statement.

[Studentmadhura05]

Hi
I am trying to Push one line at a time from three different arrays into a new array
Here is a part of the code that is giving trouble:

     my @result_line;
 
     while ($entries >=  0 ){
     @result_line = ();
     push @result_line, $result_line1[$entries];
     push @result_line, $result_line2[$entries];
     push @result_line, $result_line3[$entries];
     print "@result_line\n";
     $entries--;
 }

The code gets compiled with rest of the code and also gives me proper result But I am getting following (warning) message each time it loops through the while loop:

Use of uninitialized value in join or string at search_IP.plx (for the line with the Print statement)

I have initialized the array @result_line then why is it happening?
Please help.
Thanks

[GunnarH]

why is it happening?

Because you push() one or more undefined values into @result_line.

If that's not help enough, please post a short but complete program, that we can copy and run, and that demonstrates the issue.

[Studentmadhura05]

Hi,
I did not paste the lines where I have aleady declared and initialized the arrays that i am pushing.

my @result_line1 = grep (/lease/, @result);
my @result_line2 = grep (/starts/, @result);
my @result_line3 = grep (/ends/, @result);
 
while ($entries >=  0 ){
     @result_line = ();
     push @result_line, $result_line1[$entries];
     push @result_line, $result_line2[$entries];
     push @result_line, $result_line3[$entries];
     print "@result_line\n";
     $entries--;
}

Actually there is no array or variable that is not initialized. Please help.

[GunnarH]

That's still not a complete program.

It's not about a variable, but at least one element in @result_line is undefined.

C:\home>type test.pl
use warnings;
my @array = ('blue', undef, 'yellow');
print "@array\n";
 
C:\home>test.pl
Use of uninitialized value in join or string at C:\home\test.pl line 3.
blue  yellow
 
C:\home>

[miller]

Just because the arrays are initialized, does not mean that the scalar elements that you are trying to access are also initialized:

my @result_line1 = grep (/lease/, @result);
my @result_line2 = grep (/starts/, @result);
my @result_line3 = grep (/ends/, @result);
 
warn "badness1" if $entries > $#result_line1;
warn "badness2" if $entries > $#result_line2;
warn "badness3" if $entries > $#result_line3;