fig06_07.pl

来自「PERL语言资料 可以用于PERL程序设计」· PL 代码 · 共 44 行

#!/usr/bin/perl
# Fig 6.7: fig06_07.pl
# Demonstrating a subroutine that returns a scalar or a list.

# call scalarOrList() in list context to initialize @array, 
# then print the list
@array = scalarOrList();  # list context to initialize @array
$" = "\n";                # set default separator character
print "Returned:\n@array\n";

# call scalarOrList() in scalar context and concatenate the 
# result to another string
print "\nReturned: " . scalarOrList();  # scalar context

# use wantarray to return a list or scalar 
# based on the calling context
sub scalarOrList
{
   if ( wantarray() ) {   # if list context
      return 'this', 'is', 'a', 'list', 'of', 'strings';
   }
   else {               # if scalar context
      return 'hello'; 
   }
}



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