两个程序的不同之处

第一个程序:
#! /usr/local/bin/perl -W
#fig06_07.pl
@array=scalarOrList();
$"="->";  # set default separator character
print "Return: \n@array\n";
print $";
print "\nReturned: " . scalarOrList(), "\n";

sub scalarOrList {
   if(wantarray()) {
      return 'this','is','a','list','of','strings';
   }
   else {
      return 'hello';
   }
}

输出如下:
Return:
this->is->a->list->of->strings
->
Returned: hello

第2个程序:
#! /usr/local/bin/perl -W
#fig06_07.pl
@array=scalarOrList();
$"="->";  # set default separator character
print "Return: \n@array\n";
print $";
print "\nReturned: " ,scalarOrList(), "\n";

sub scalarOrList {
   if(wantarray()) {
      return 'this','is','a','list','of','strings';
   }
   else {
      return 'hello';
   }
}
输出如下:
Return:
this->is->a->list->of->strings
->
Returned: thisisalistofstrings

差别仅在于一个是 "." 一个是","