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Making a dynamic high scores table

by chickenlips (Initiate)
on Dec 01, 2012 at 15:19 UTC ( #1006606=perlquestion: print w/replies, xml ) Need Help??
chickenlips has asked for the wisdom of the Perl Monks concerning the following question:

Basically, I have a set of scores that will be pushed into an array each time the program loops (i.e. the person says they want to play again) This is my code so far:
print "Your final score is: $score_total\n\n"; # score organiser. print "Please enter your initials for the high score table: \n"; chomp (my $initial_add = <STDIN>); my @initials_array = (); push (@initials_array, $initial_add); my @score_array = ($score_total); push (@score_array, $score_total); print "Name = $initials_array[0]\tScore = $score_array[0]\n"; print "Initials \t Score \n";
It is worth noting that the variable $score_total is the score from an earlier bit of code, every time this bit finishes and the $score_total is pushed into @score_array, the $score_total gets intialized to 0 again so a new score can be added. How can I go about putting this in a high scores table that is displayed as the above code part : print "Name = $initials_array[0]\tScore = $score_array[0]\n"; I want it to add the scores each time the game is played so that the high scores table gets more populated. THANKS IF ANYONE CAN HELP!!

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Re: Making a dynamic high scores table
by Athanasius (Chancellor) on Dec 01, 2012 at 16:14 UTC

    When you declare a variable with my, you initialise it. If you do this inside a loop, the variable is re-initialised on each loop iteration. But if you want the variable to grow as the loop iterates, you need to declare it once only, before the loop:

    my @initials; my @scores; while (...) # The major loop { ... push @initials, $initial_add; push @scores, $score_total; ... } # access @initials and @scores here

    Hope that helps,

    Athanasius <°(((><contra mundum

Re: Making a dynamic high scores table
by roboticus (Chancellor) on Dec 01, 2012 at 17:20 UTC


    I'd suggest storing the high score list in a file so that when you restart the game, you still have the original values. So your subroutine to save & display high scores might be something like:

    1. Read high-score-list file
    2. Add new score, initials
    3. Sort list
    4. Display
    5. Write back new high-score-list to file

    Optionally, if you want to keep only the top X scores, then after sorting, just write the first X items back to the new file. Also, to prevent a program problem from causing you to lose the entire list, write the new list to a different file. Once you're done, then you can rename the original to original.bak, and then rename the new file to the original name.


    When your only tool is a hammer, all problems look like your thumb.

Re: Making a dynamic high scores table
by space_monk (Chaplain) on Dec 01, 2012 at 16:32 UTC

    Just to say that programs that play games don't typically "loop"; they are normally state driven and respond to events instead. The only "loop" is the one containing the event handler(s).

    I'm not saying you can't have a loop to restart the game, but it ain't a good way to continue...

    A Monk aims to give answers to those who have none, and to learn from those who know more.
Re: Making a dynamic high scores table
by kcott (Chancellor) on Dec 02, 2012 at 08:35 UTC

    G'day chickenlips,

    Here's a solution using Tie::File which allows you to keep track of high scores within and between instances of your program running.

    #!/usr/bin/env perl use strict; use warnings; use Tie::File; use constant MAX_HIGH_SCORES_TO_SHOW => 10; my $high_score_data_file = './pm_high_score.dat'; tie my @high_scores, 'Tie::File', $high_score_data_file or die $!; while (1) { print 'Initials (or Return to end): '; chomp (my $initials = <>); last unless length $initials; my $random_score = 1 + int rand 100; print "Random score: $random_score\n"; print "<<<<<<< Before Adding:\n"; display_high_scores(\@high_scores, MAX_HIGH_SCORES_TO_SHOW); add_high_score(\@high_scores, $random_score, $initials); print ">>>>>>> After Adding:\n"; display_high_scores(\@high_scores, MAX_HIGH_SCORES_TO_SHOW); } untie @high_scores; sub add_high_score { my ($high_scores_ref, $score, $name) = @_; my $record = @$high_scores_ref; for (0 .. $#$high_scores_ref) { if ((split /\s+/, $high_scores_ref->[$_])[0] < $score) { $record = $_; last; } } splice @$high_scores_ref, $record, 0, join ' ' => $score, $name; return; } sub display_high_scores { my ($high_scores_ref, $max_to_show) = @_; $max_to_show = MAX_HIGH_SCORES_TO_SHOW unless defined $max_to_show +; $max_to_show = @$high_scores_ref if $max_to_show > @$high_scores_r +ef; my $printf_pattern = "%-5d %s\n"; print "High Score Table\n"; for (0 .. $max_to_show - 1) { printf $printf_pattern => split /\s+/, $high_scores_ref->[$_], + 2; } return; }

    Here's a sample run:

    $ cat pm_high_score.dat cat: pm_high_score.dat: No such file or directory $ Initials (or Return to end): AA Random score: 82 <<<<<<< Before Adding: High Score Table >>>>>>> After Adding: High Score Table 82 AA Initials (or Return to end): BB Random score: 69 <<<<<<< Before Adding: High Score Table 82 AA >>>>>>> After Adding: High Score Table 82 AA 69 BB Initials (or Return to end): $ cat pm_high_score.dat 82 AA 69 BB ... ran several times to exceed MAX_HIGH_SCORES_TO_SHOW ... High Score Table 90 II 90 LL 85 DD 82 AA 81 EE 69 BB 56 CC 55 GG 39 JJ 23 FF Initials (or Return to end): $ cat pm_high_score.dat 90 II 90 LL 85 DD 82 AA 81 EE 69 BB 56 CC 55 GG 39 JJ 23 FF 22 KK 18 HH 16 MM

    -- Ken

Re: Making a dynamic high scores table
by Anonymous Monk on Dec 01, 2012 at 15:30 UTC

    You fill in the blanks

    sub ShowScore { }
Re: Making a dynamic high scores table
by Anonymous Monk on Dec 01, 2012 at 15:43 UTC
    Can you write loop that adds items onto an array?

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