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
$ pm_high_score.pl
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
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