I have a subroutine that's outputting a float correctly, however when added to a value the last return gives a Euler's number for some reason. Does anyone know why this is and how can I just get the 0 that I'm expecting? Below is my code:

use strict;
use warnings;

my @vals = (
'00000000{',
'00000000{',
'00000000{',
'00000369I',
'00000020{',
'00000000{',
'00000100}',
'00000289R',);

my $total;

foreach (@vals) {
    $total += calc_total($_);
    print "\$total: $total\n";
}

sub calc_total {

    my $val = shift;

    my %pos_map = ('A' => 1, 'B' => 2, 'C' => 3, 'D' => 4, 'E' => 5, '
+F' => 6,
                   'G' => 7, 'H' => 8, 'I' => 9, '{' => 0);

    my %neg_map = ('J' => 1, 'K' => 2, 'L' => 3, 'M' => 4, 'N' => 5, '
+O' => 6,
                   'P' => 7, 'Q' => 8, 'R' => 9, '}' => 0);

    my $outval = substr($val, 0, 8);

    if (exists($pos_map{substr($val, -1, 1)})) {
        $outval .= $pos_map{substr($val, -1, 1)};
    } elsif (exists($neg_map{substr($val, -1, 1)})) {
        $outval .= $neg_map{substr($val, -1, 1)};
        $outval *= -1;
    } else {
        print "Could not map total for: $val\n";
    }
    print "in the sub: " . sprintf("%.2f", $outval/100) . "\n";
    return sprintf("%.2f", $outval/100);
}
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I'm using Perl 5.16, too.