Perl-Sensitive Sunglasses PerlMonks

### Comment on

 Need Help??

Today, deMize asked in the chatterbox how to convert the number 4335043554366887798866555766 to hexadecimal. One solution is of course to use dc:

```dc -e16o4335043554366887798866555766p

The easiest perl solution is probably to use the Math::BigInt module:

```perl -wE 'use Math::BigInt; say Math::BigInt->new("4335043554366887798
+866555766")->as_hex;'

But here's another, more complicated solution.

```perl -wE '
no warnings "uninitialized";
my(\$a, \$b) = @_; my @b = @\$b; my \$c;
for (my \$k = 0; @b || \$c; \$k++) {
\$c = 16 <= (\$\$a[\$k] += \$c + shift @b); \$\$a[\$k] %= 16;
}
}
my \$n = "4335043554366887798866555766";
my \$h = []; for my \$d (split //, \$n) {
+[\$d];
}
say join "", reverse map { sprintf "%x", \$_; } @\$h;
'

Update: deleted the unnecessary sub from the code.

Update 2011-03-18: see also Re: Module for 128-bit integer math? for a list of bigint modules.

Update 2012-08-25: see also Re: Zeckendorf representation for another conversion, this time to a more unusual number system.

In reply to Convert big number from decimal to hexadecimal by ambrus

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":

• Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
• Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
• Read Where should I post X? if you're not absolutely sure you're posting in the right place.
• Posts may use any of the Perl Monks Approved HTML tags:
a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
• You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
 For: Use: & & < < > > [ [ ] ]
• Link using PerlMonks shortcuts! What shortcuts can I use for linking?

Create A New User
Chatterbox?
and all is quiet...

How do I use this? | Other CB clients
Other Users?
Others taking refuge in the Monastery: (6)
As of 2017-08-24 09:38 GMT
Sections?
Information?
Find Nodes?
Leftovers?
Voting Booth?
Who is your favorite scientist and why?

Results (367 votes). Check out past polls.

Notices?