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General Strawberry questions

Wildcard
Novice

Oct 11, 2017, 2:34 PM

Post #1 of 4 (3200 views)

General Strawberry questions	Can't Post

Hello there everyone, I hope somone can clarify this little problem I have :)

Well, I am on Windows 10, and so I have now Strawberry installed, and strucked to 2 problems I would like to have answered, if you please..

1 ) How does the CPAN module works? I wanted to use the getOpt for command line parameters, so tried to run the "CPAN Client", I clicked on it, a breaksecond of a command window apperad, and then nothing.

2) how do you debug? Maybe it seems strange that I never debuged before, I always used strict and warnings, that was enough. But now I intentionaly invoked a code, which doesn't work:

Code

my $x = <>;  
my $y = fak($x);  
 
print "$x $y \n";  
exit(0);  
 
sub fak  
             { 
              my $p = shift;  
              return ($p * fak($p - 1));  
              }

How do I prompt a debug? I tried "-d" in the Strawberry command line, but with no prevail. I hope somebody have some insight concerning this. Thanks in advance!

Laurent_R
Veteran / Moderator

Oct 11, 2017, 3:02 PM

Post #2 of 4 (3197 views)

Re: [Wildcard] General Strawberry questions [In reply to]	Can't Post

Try to use it from the command line (when on Windows, I use the cmd window prompt, but I guess it should also work on the powershell command line).

Then, something like "cpan module_name" should probably work.

And, to debug, also try from the cmd prompt, with the "-d" command line option:

Code

perl -d my_program.pl

(Then, use "h" to view the available commands in the help menu.)

Chris Charley
User

Oct 12, 2017, 11:51 AM

Post #3 of 4 (3179 views)

Re: [Wildcard] General Strawberry questions [In reply to]	Can't Post

A note on your program (finding a factorial).

It needs a condition to stop the recursion.

Code

#!/usr/bin/perl 
use strict; 
use warnings; 
 
my $x = <>;   
my $y = fak($x);   
  
print "$x $y \n";   
  
sub fak  {  
	my $p = shift; 
	return 1 if $p == 0; 
    return ($p * fak($p - 1));   
}

Wildcard
Novice

Oct 12, 2017, 1:31 PM

Post #4 of 4 (3174 views)

Re: [Chris Charley] General Strawberry questions [In reply to]	Can't Post

First of all, thanks again for the answers, much abliged.
And yeah, I know about that stop condition, that's why I wanted to run a debug through that code, this is the whole point of it :)

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