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Perl Card Shuffle - Calling up a library file

Posted on 2008-10-28
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Last Modified: 2008-10-29
I have created a card shuffling script in perl. It shuffles up the deck and prints the top 5 cards. Now I'm being asked to remove the code that does the shuffling and include it as another function of a library file I've already create  "obj13-lib.pl". Here's what should take place. After the first "hand" is dealt, call the shuffling function again before dealing another, different hand.

Here's the code for my card shuffling program.

#!/usr/bin/perl

@startingdeck = ("A H","2 H","3 H","4 H","5 H","6 H","7 H","8 H",
                 "9 H","10 H","J H","Q H","K H",
                 "A D","2 D","3 D","4 D","5 D","6 D","7 D","8 D",
                 "9 D","10 D","J D","Q D","K D",
                 "A C","2 C","3 C","4 C","5 C","6 C","7 C","8 C",
                 "9 C","10 C","J C","Q C","K C",
                 "A S","2 S","3 S","4 S","5 S","6 S","7 S","8 S",
                 "9 S","10 S","J S","Q S","K S");
for my $x(0..99){
     my@shuffle=(
        shift(@startingdeck),
        pop(@startingdeck),
        shift(@startingdeck),
        pop(@startingdeck),
        shift(@startingdeck),
        pop(@startingdeck),
        shift(@startingdeck),
        pop(@startingdeck),
);
   push@startingdeck, @shuffle;
}
   print"@startingdeck [0..4]\n";




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Question by:l1nuxxx
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3 Comments
 
LVL 39

Expert Comment

by:Adam314
ID: 22822976
This sounds like homework... Experts are not allowed to do your homework.  

This page might be helpful:
http://perldoc.perl.org/perlsub.html
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Author Comment

by:l1nuxxx
ID: 22823319
I understand....
what I have done so far is I removed
for my $x(0..99){
     my@shuffle=(
        shift(@startingdeck),
        pop(@startingdeck),
        shift(@startingdeck),
        pop(@startingdeck),
        shift(@startingdeck),
        pop(@startingdeck),
        shift(@startingdeck),
        pop(@startingdeck),
);
   push@startingdeck, @shuffle;
}
   print"@startingdeck [0..4]\n";
from the card shuffling program.
I added the code above to a file called "obj13-lib.pl. My card shuffling program is named obj13-1.pl. I added to line "require obj13-lib.pl" to the obj13-1.pl file. When I type ./obj13-1.pl all if prints our is the first five cards. It does not shuffle.
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LVL 39

Accepted Solution

by:
Adam314 earned 500 total points
ID: 22824800
There are several ways to do this... this is what I'd recommend:

Have the main program define a deck of cards, as you have.
Have the library file have a function that takes as input a deck of cards, and returns a shuffled deck of cards.
See the perlsub documentation for more on how to have a function get input and return values.
Have the main program call the shuffling function, getting a shuffled deck.  Remove/print out 5 cards.
Have the main program call the shuffling function again - if you want to shuffle only the remaining cards, pass the output from the previous function call.  If you want to start with a new deck, pass the original deck.  Remove/print out 5 cards.
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