#!/usr/bin/perl -w
my @names=qw/ fred barney betty dino wilma pebbles bamm-bamm /;
my $result=&which_element_is("dino",@names);

sub which_element_is {
  my($what,@array)=@_;
  foreach (0..$#array) {
    if ($what eq $array[$_]) {
      return $_;
    }
  }

  -1；

}
print "The position is $result\n";

查找单词位于第几个(-1表示没有找到)