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### Re^2: decimal to fraction

by huck (Vicar)
 on Sep 12, 2017 at 13:07 UTC ( #1199198=note: print w/replies, xml ) Need Help??

in reply to Re: decimal to fraction

Heh, While technically correct, IMHO this is kinda cheating

```9: 49420098210293 / 100000000000000 = 0.49420098210293 (0)
and on the same scale amazingly useless result :-):

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Re^3: decimal to fraction
by pryrt (Priest) on Sep 12, 2017 at 13:47 UTC

The numerator and denominator are mutually prime (no common factors), and thus the fraction is fully reduced. How else would you represent it as a fraction?

```#!/usr/bin/env perl -l
use warnings;
use strict;

#####
# [id://56906] for quick gcf
sub gcf {
my (\$x, \$y) = @_;
(\$x, \$y) = (\$y, \$x % \$y) while \$y;
return \$x;
}

######

print gcf(49420098210293,100000000000000);  # prints 1

#####

use Math::Prime::Util qw/is_prime factor/;
print is_prime(49420098210293);             # not prime (I wasn't sure
+ when I started my answer)
local \$, = 'x';
print factor(49420098210293);               # 113x4729x92481709
print factor(100000000000000);              # 2x2x2x2x2x2x2x2x2x2x2x2x
+2x2x5x5x5x5x5x5x5x5x5x5x5x5x5x5
# no common factors

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