Perl 语言入门课后习题

#!/usr/bin/perl
#use strict;
use 5.010;
use warnings;
use strict;

sub total{
my $lost;
foreach  (@_) {
	$lost+=$_;
	}
	$lost;
}
#my @nnaa=qw/1 2 3 4 5 1 1 2 4 1 2 4/;
#print total(1..1000);
sub above_average{
	my $total;
   foreach  (@_) {
         $total+=$_;
   }
   my $average=$total/@_;
   foreach  (@_) {
	   if ($_>$average) {
		   print $_," ";
	   }
   }
}
#&above_average(1..100);
sub greet{
	state $num=0;
	state @allpe;
	my $name;
	if ($num==0) {
     print "Hi ",$_[0],",You are the first one here","n";
	 push @allpe,$_[0];
      $num++;
    }
	elsif ($num>0) {
		print "Hi "," there is ";
		foreach  $name (@allpe) {
			print $name," ";
		}
		print "here","n";
		push @allpe,$_[0];
     $num++;
	}
} 
&greet("john");
&greet("li");
&greet("sha");

碰到的问题：

1、由于环境是activeperl,在使用state标志时，必须先声明use 5.010;