topic Re: convert hexa to decimal values in Operating System - Linux

convert hexa to decimal values

mobidyc — Fri, 06 Apr 2007 08:01:41 GMT

Hello,

i'm trying to convert an hexadicimal value to decimal but it seems impossible with my knowledge. ;)

that's what i tried (under ksh).
HPUX B.11.00:
# echo 0xfffff000=D |adb
-4096
# printf "%d\n" 0xfffff000
printf: Error converting 0xfffff000
2147483647
# print - $((16#fffff000))
-4096
# echo "obase=86 0xfffff000" |bc -l
syntax error on line 1, /usr/lib/lib.b
# echo "obase=86 ; fffff000" |bc
syntax error on line 1
# echo "fffff000" |tr "[[:xdigit:]]" "[[:digit:]]"
tr: String2 contains an invalid character class.

i've the same errors in HP-UX B.11.11/B.11.23

i need to convert these values for a script so, do you have advice for it ?

Regards,
Cedrick Gaillard

Re: convert hexa to decimal values

Dennis Handly — Fri, 06 Apr 2007 08:12:31 GMT

You can use this one liner:
$ typeset -i10 x=16#fffff000; echo $x
(This returns an unsigned int for 11.23 and 11.31 ksh. sh returns -4096.)

What was wrong with your adb and $(( )) solutions?

Re: convert hexa to decimal values

James R. Ferguson — Fri, 06 Apr 2007 08:13:49 GMT

Hi:

There's nothing wrong with your methodology, only that your numbers exceed 32-bit integers.

Regards!

...JRF...

Re: convert hexa to decimal values

mobidyc — Fri, 06 Apr 2007 08:48:33 GMT

thanks for your answers,

i know now that this is because my numbers exceed 32-bit integers.

do you have a solution for convert these values correctly ?
my system is 64bits, is there a 64bit binary who can calculate the result?

the result of 0xfffff000 would be 4294963200, not -4096

and why

Re: convert hexa to decimal values

Bill Hassell — Fri, 06 Apr 2007 08:58:23 GMT

bc is your friend. Although ksh93 does exist on HP-UX (skillfully hidden away in /usr/dt/bin/dtksh) it is also limited to 32 bit numbers. bc can handle large numbers:

$ echo "4294963200*1234.234"|bc
5300989610188.800

Re: convert hexa to decimal values

James R. Ferguson — Fri, 06 Apr 2007 09:06:29 GMT

Hi (again) Cedrick:

In the shell, using 'bc' is an easy way:

# echo "obase=10;ibase=16;FFFFF000"|bc

...note the uppercase hexadecimal digits.

Regards!

...JRF...

Re: convert hexa to decimal values

mobidyc — Fri, 06 Apr 2007 09:10:17 GMT

Hello,

as indicated behind, i've tried bc, maybe with a wrong syntax:

# echo "obase=86 ; fffff000/1024/1024" |bc
syntax error on line 1,

i've just looking something, at home i've a linux, it have a 32bit processor however, it can convert without problem so, where is the limitation ?

$> uname -s ; printf "%d\n" 0xfffff000
Linux
4294963200

# uname -s ; printf "%d\n" 0xfffff000
HP-UX
printf: Error converting 0xfffff000
2147483647

Regards,
Cedrick Gaillard

Re: convert hexa to decimal values

James R. Ferguson — Fri, 06 Apr 2007 09:27:00 GMT

Hi (again) Cedrick:

Use UPPERCASE hexadecimal digits with 'bc' as I showed above.

Regards!

...JRF...

Re: convert hexa to decimal values

mobidyc — Fri, 06 Apr 2007 09:29:06 GMT

Big thanks James,

the uppercase letter give me no errors from bc now and correct my [io]base variables has gived to me a good result.

problem is solved, thanks ;)

Regards,
Cedrick Gaillard

Re: convert hexa to decimal values

Dennis Handly — Fri, 06 Apr 2007 19:17:29 GMT

>at home i've a linux, it have a 32bit processor however, it can convert without problem so, where is the limitation?

Does it handle arbitrary 64 bit numbers? Like the 11.23 ksh?

I guess it depends on the standard and whether it is worth it to extend it to long longs.

Re: convert hexa to decimal values

Michael D. Zorn — Mon, 09 Apr 2007 11:00:54 GMT

HP 11.11 here.
#bc
ib=16
FFFFF000
4294963200
^D
#

If you're converting not to many numbers, you could try

#perl -e '$x=0xFFFFF000;print "$x\n"'
429496320
#

If it's a very few numbers, you can go to basics:

FFFFF000 = FFFFFFFF - FFF

FFFFFFFF is one less than x100000000, which is 16^8 (=4294967296), or 4294967295

FFF is one less than x1000 (4095)

4294967295 - 4095 = 4294963200

Or even:
16^8 - 16^3 = 4294963200

(In hex, that's
100000000 - 1000 = 0xFFFFF000)

Here's a short perl routine:

$!/usr/bin/perl
while () {
print hex "$_"; print "\n";
}

(For some odd reason, this doesn't work:
print hex "$_\n";
)

and you can always change to read from a file.

Re: convert hexa to decimal values

James R. Ferguson — Mon, 09 Apr 2007 11:07:57 GMT

Hi:

If you wish to use Perl's 'hex' function you can do:

# echo FF|perl -nle 'print hex'
255

(or):

# perl -le 'print hex $ARGV[0]' FFFF
65535

Regards!

...JRF...

Re: convert hexa to decimal values

Ralph Grothe — Tue, 10 Apr 2007 04:13:31 GMT

As for the Perl variants,
if you give it as a literal there's even no need for a call of oct() or hex().

$ perl -le 'print 0xfffff000'
4294963200

Obviously, this doesn't work anymore if read from stdin or a file.

$ perl -le 'print shift' 0xfffff000
0xfffff000

then you have to use oct or hex

$ perl -le 'print hex shift' 0xfffff000
4294963200

$ perl -le 'print oct shift' 0xfffff000
4294963200