That seems like an inadequate sample to give us a complete picture of what needs to be done.

Also, since you tried a lot, it would be useful to us for you to demonstrate a Short, Self-Contained, Correct Example of the code you tried. 30 lines or less ought to be adequate for a complete example.

With that information we will gain a better sense of what you are after, as well as of where you are stuck, and can assist you in getting over the hurdle.

You received similar advice previously; to provide samples of the code you are working on. It's the right thing to do. It helps us to be more effective in helping you, and avoids our wasting time presenting tips that you already have learned. Without posting code we might also begin to conclude that you prefer to have us do your homework for you.

Please provide at least the desired output with the sample input you've supplied.

And show what you've tried.

I have File Like this.

BOOK_Author AYN RAND, ERNEST HEMINGWAY, JOAN DIDION

+RAY BRADBURY, GEORGE R.R. MARTIN

+GILLIAN FLYNN

Famous_singer Linkinpark, Lilwayne, Nikiminaj,

+seanpaul, Akon, Tpain

+Emenim

DESIRED OUTPUT

AYN RAND,ERNEST HEMINGWAY,JOAN DIDION,RAY BRADBURY,GEORGE R.R.MARTIN,GILLIAN FLYNN

Linkinpark,Lilwayne,Nikiminaj,seanpaul,Akon,Tpain,Emenim

I need to match the AUTHORS and SINGERS from different lines and need to put them in a respective array say @author and @singer. I tried alot. I couldnt do that so please anyone help me to solve this.

Have you reviewed your course material? I would expect that it covers everything you need to approach this problem.

Please help us give you better answers. Show us what code you have already written, and explain to us what it does and where it fails to do what you need.

Also review push, split and likely perlsyn.

I tried alot.

Why not provide a couple of the algorithms which you tried? Someone might then be able to point out where you were going wrong. Perhaps even one of those algorithms was a valid one and it was merely your code which was flawed. But again, with neither algorithm nor code to view we will never know.

The key to this kind of problem is that when the line begins with a "continue-command"(plus) you want to process the rest of the line using the last "state" you were in, but when it doesnt begin with a "continue-command"(plus) you want to capture the new state, process the rest of the line with the new state, and remember that new state as the last_state for any following "continue-command"(plus) lines. Something like this

my $last_state=''; 

  while (my $line= <DATA>) { 
    chomp $line; 
    next unless ($line); 
    if (substr($line,0,1) eq '+') {
      # if line starts with a plus use last_state to process 
      process($last_state,substr($line,1));
      } 
    else { 
      # otherwise set last_state and process with it
      my @parts=split(' ',$line,2); 
      $last_state=$parts[0]; 
      process($last_state,$parts[1]);
      } 
  
    } # line 
sub process { 
  my $state=shift; 
  my $input=shift; 
  ... do stuff based on $state and $input ... 
  } # process
[download]