1 / 7 = 0.142857142857143 = 0x6FDF1234

That hex value doesn't correspond to either a float or double in IEEE format?

print unpack 'h*', pack 'f', 1/7;;
529421e3

print unpack 'h*', pack 'd', 1/7;;
2942942942942cf3
[download]

Well, FWIW, https://www.wolframalpha.com/input/?i=1%20%2F%207%20%3D%200.142857142857143%20%3D%200x6FDF1234 seems to poop it out just fine

I figure it is https://en.wikipedia.org/wiki/Single-precision_floating-point_format but I can't get it correct

I can get https://en.wikipedia.org/wiki/Single-precision_floating-point_format#Single-precision_examples on my machine (3eaa aaab ≈ 1/3) with

 $ perl -le " print unpack 'H*', pack 'f>', 1/3
3eaaaaab
[download]

but basically I tired brute forced it :)

I also saw these and they might have something to do with it, but the bits got me :) Network IEEE 754 to Native Floats: which pack/unpack ops better?, Extracting IEEE 754 floating point numbers

I've no idea what that hex value is, but it certainly isn't any IEEE representation of 1/7.

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HA! I completely got fooled by wolfraudalpha

https://www.wolframalpha.com/input/?i=convert+1%2F7+to+hex

Search?

I try it :)

 [to hex], [convert to hex] to hex, convert to hex -> How to zero-pad hex values in sprintf()?, integer value to hex value, Convert to Hexadecimal, Converting Hexadecimal to Decimal notation and vice-versa

so sprintf '%x' ... or unpack 'H*', ... or Math::BigInt->as_hex

The Perl Monks Guide to the Monastery

Like the other monks, I’m not clear on the question being asked here. However, if floating point numbers in hexadecimal notation are wanted, Data::Float may be what you’re looking for:

#! perl
use strict;
use warnings;
use Data::Float qw( float_hex hex_float );

my $n = 1 / 7;
my $h = float_hex($n);
my $d = hex_float($h);

print "fraction =    $n\nhex      = $h\ndecimal  =    $d\n";
[download]

Output:

14:46 >perl 538_SoPW.pl
fraction =    0.142857142857143
hex      = +0x1.2492492492492p-3
decimal  =    0.142857142857143

14:47 >
[download]

Hope that helps,

I want to do some text analysis of stock data. I cannot do what I want using numbers, only alpha or hex. I want to convert the numbers to the four byte hex representation of a float (or eight bytes for a double). I didn't think to check CPAN. I'll try the above code. Thanks to all that replied. Mike

I know a float is a four byte value. I want to have the hex string representation of those four bytes. If (2**16) is 65536, I want 65536 to be 0x0000ffff (or 0xffff0000, whatever order). Mike