subroutine

As per my sample code below, there are two styles to call a subroutine: subname and subname() . #!C:\Perl\bin\perl.exe use strict; use warnings; use 5.010; &marine(); # style 1 &marine; # style 2 sub marine { state $n = 0; # private, persistent variable $n $n += 1; print "Hello, sailor number $n!\n"; } Which one, &marine(); or &marine; , is the better choice if there are no arguments in the call? In Learning Perl , where this example comes from, we're at the very beginning of showing you subroutines. We only tell you to use the & so that you, as the beginning Perler, don't run into a problem

I am using cygwin. What this script does is load the iphone pics that I have loaded into a directory on the desktop. It opens it up in image viewer, to let me take a look at the picture. system("cygstart $dirname/$oldfile") ; Then it gives me the option to rename the picture. It is throwing errors though, and not renaming the picture. Use of uninitialized value $oldfile in concatenation (.) or string at ./rename_image.pl line 29, <STDIN> line 6. oldfile is a global varaible, the functions should see the variable. #!/usr/bin/perl # use strict ; use warnings ; my $oldfile; my $new_name; my

I am using Abaqus with user-defined subroutines. To the best of my knowledge, Abaqus Standard or Explicit can be used with subroutines written specifically in Fortran 77 language, not the improved Fortran 90/95 language! Is there a way how to use Fortran 90 and later with Abaqus? By default, Abaqus expects user subroutines to be written in the older fixed-format style. However, you can use just about any modern language feature supported by your compiler. 1 This includes using modules, new intrinsics, derived types, etc, as long as you adhere to the fixed-format style. But if you find the

As far as I know, in Perl, we can call a subroutine from a Module by using these techniques: Export subroutine foo , import the module which has this subroutine. Finally call it in your perl script. Create an Object of that Module in your perl script finally call foo using that Object . Directly call foo using its path, like this myDir::Module::foo(); . If I am always confused which is better way of calling a subroutine foo . If I have a dynamic script, which I run from the browser and not command line, which approach one should go for so that the script takes less time. Thanks. There is a