Joelle's Solutions to 21.1

2 files changed, 82 insertions, 0 deletions

diff --git a/challenge-021/joelle-maslak/perl5/ch-1.pl b/challenge-021/joelle-maslak/perl5/ch-1.pl
new file mode 100755
index 0000000000..e8c7e19b3b
--- /dev/null
+++ b/challenge-021/joelle-maslak/perl5/ch-1.pl
@@ -0,0 +1,43 @@
+#!/usr/bin/env perl
+use v5.22;
+use strict;
+use warnings;
+
+
+use Math::BigRat;
+
+sub main() {
+    die "Usage: $0 <digits>" if @ARGV > 1;
+    my $digits = ( shift @ARGV ) // 10;
+    die "Usage: $0 <digits>" if $digits !~ m/^[0-9]+$/ms;
+
+    return unless $digits;
+    if ( $digits == 1 ) {
+        say "2";
+        return;
+    }
+
+    my $e       = Math::BigRat->new(2);
+    my $current = Math::BigRat->new(1);
+    my $denom   = Math::BigRat->new(1);
+
+    my $chkdigits = $digits;
+
+    do {
+        $current++;
+        $denom *= $current;
+
+        $e += Math::BigRat->new("1/$denom");
+        if (length($denom) >= $chkdigits + 3) {  # 2 should be enough, but we'll be safe
+            my $digit = ((int $e * (Math::BigRat->new(10)**$chkdigits)) % 10);
+            if ($digit =~ m/[49]$/) {
+                $chkdigits++;
+            }
+        }
+    } while ( length($denom) < $chkdigits + 3 );
+
+    say $e->as_float($digits);
+    return;
+}
+
+main();
diff --git a/challenge-021/joelle-maslak/perl6/ch-1.p6 b/challenge-021/joelle-maslak/perl6/ch-1.p6
new file mode 100755
index 0000000000..f4b281f286
--- /dev/null
+++ b/challenge-021/joelle-maslak/perl6/ch-1.p6
@@ -0,0 +1,39 @@
+#!/usr/bin/env perl6
+use v6;
+
+#
+# Copyright © 2019 Joelle Maslak
+# All Rights Reserved - See License
+#
+
+multi sub MAIN(UInt:D $digits where * == 0) { return; }
+multi sub MAIN(UInt:D $digits where * == 1) { say "2"; return; }
+multi sub MAIN(UInt:D $digits = 10) {
+    return unless $digits;
+
+    my FatRat $limit = FatRat.new(1, 10**$digits);
+
+    my FatRat $e = FatRat.new(2);
+    my $current  = 1;
+    my $denom    = 1;
+
+    my $chkdigits = $digits;
+    repeat {
+        $current++;
+        $denom *= $current;
+
+        $e += FatRat.new(1, $denom);
+
+        if $denom.chars >= ($chkdigits + 3) {    # 2 should be enough, but we'll be safe
+            if $e.substr(0, $chkdigits+2) ~~ / <[4 9]> $/ {
+                $chkdigits++;
+            }
+        }
+    } while $denom.chars < $chkdigits+3;
+
+    $e += FatRat.new(5, (10**$digits+1) );
+    say $e.substr(0, $digits+1);
+    return;
+}
+
+