use strict;
use warnings;

# mainline--------------------------
mygreeting "world";

# subroutines ----------------------
sub mygreeting {
   my $salutation = shift;
   print "hello $salutation\n";
}

##</code><code>##

String found where operator expected at g1.pl line 5, near "mygreeting "world""
        (Do you need to predeclare mygreeting?)
syntax error at g1.pl line 5, near "mygreeting "world""

##</code><code>##

mygreeting("world");