{"id":19220,"date":"2022-11-05T21:45:48","date_gmt":"2022-11-05T16:15:48","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-perl-quick-switch-from-quaternary-to-decimal\/"},"modified":"2022-11-05T21:45:48","modified_gmt":"2022-11-05T16:15:48","slug":"solved-perl-quick-switch-from-quaternary-to-decimal","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-perl-quick-switch-from-quaternary-to-decimal\/","title":{"rendered":"[Solved] perl quick switch from quaternary to decimal"},"content":{"rendered":"

[ad_1]
\n<\/p>\n

\n
\n
<\/div>\n
\n
\n

Base 4 requires exactly 2 bits, so it’s easy to handle efficiently.<\/p>\n

my $uvsize = length(pack('J>', 0)) * 8;\nmy %base4to2 = map { $_ => sprintf('%2b', $_) } 0..3;\n\nsub base4to10 {\n   my ($s) = @_;\n   $s =~ s\/(.)\/$base4to2{$1}\/sg;\n   $s = substr((\"0\" x $uvsize) . $s, -$uvsize);\n   return unpack('J>', pack('B*', $s));\n}\n<\/code><\/pre>\n
This allows inputs of 16 digits on builds supporting 32-bit integers, and 32 digits on builds supporting 64-bit integers.<\/p>\n
It’s possible to support slightly larger numbers using floating points: 26 on builds with IEEE doubles, 56 on builds with IEEE quads. This would require a different implementation.<\/p>\n
Larger than that would require a module such as Math::BigInt<\/a> for Perl to store them.<\/p>\n
\n
Faster and simpler:<\/p>\n
my %base4to16 = (\n   '0' => '0',   '00' => '0',   '20' => '8',\n   '1' => '1',   '01' => '1',   '21' => '9',\n   '2' => '2',   '02' => '2',   '22' => 'A',\n   '3' => '3',   '03' => '3',   '23' => 'B',\n                 '10' => '4',   '30' => 'C',\n                 '11' => '5',   '31' => 'D',\n                 '12' => '6',   '32' => 'E',\n                 '13' => '7',   '33' => 'F',\n);\n\nsub base4to10 {\n   (my $s = $_[0]) =~ s\/(..?)\/$base4to16{$1}\/sg;\n   return hex($s);\n}\n<\/code><\/pre>\n<\/p><\/div>\n
<\/div>\n<\/div>\n
            6<\/span> <\/p><\/div>\n<\/div>\n
[ad_2]<\/p>\n
solved perl quick switch from quaternary to decimal <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] Base 4 requires exactly 2 bits, so it’s easy to handle efficiently. my $uvsize = length(pack(‘J>’, 0)) * 8; my %base4to2 = map { $_ => sprintf(‘%2b’, $_) } 0..3; sub base4to10 { my ($s) = @_; $s =~ s\/(.)\/$base4to2{$1}\/sg; $s = substr((“0” x $uvsize) . $s, -$uvsize); return unpack(‘J>’, pack(‘B*’, $s)); } This … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[1597,442,4200],"class_list":["post-19220","post","type-post","status-publish","format-standard","hentry","category-solved","tag-pack","tag-perl","tag-unpack"],"yoast_head":"\n[Solved] perl quick switch from quaternary to decimal - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-perl-quick-switch-from-quaternary-to-decimal\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] perl quick switch from quaternary to decimal - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Base 4 requires exactly 2 bits, so it’s easy to handle efficiently. my $uvsize = length(pack('J>', 0)) * 8; my %base4to2 = map { $_ => sprintf('%2b', $_) } 0..3; sub base4to10 { my ($s) = @_; $s =~ s\/(.)\/$base4to2{$1}\/sg; $s = substr(("0" x $uvsize) . $s, -$uvsize); return unpack('J>', pack('B*', $s)); } This ... 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