converting exponential format number to decimal format number

12-14-06, 10:32 PM

Fei Liu

Hi group, is there a quick way to convert an exponential format number
to decimal format number. For example,

13.534e+10 = 1353400000

I can come up a perl function but it's not perly. Can I get some help
please? Thanks,

12-14-06, 10:44 PM

John Bokma

"Fei Liu" <fei.liu> wrote:

> 13.534e+10

perl -e "print 13.534e+10"
135340000000

perl -e "my $var = 13.534e+10; print length $var"
12

So at least here (WinXP+ActiveState) Perl does this internally.

12-14-06, 10:46 PM

usenet

Fei Liu wrote:
> Hi group, is there a quick way to convert an exponential format number
> to decimal format number. For example,
>
> 13.534e+10 = 1353400000

How about this:

print 13.534e+10;

#prints 135340000000

12-14-06, 10:49 PM

Fei Liu

John Bokma wrote:
> "Fei Liu" <fei.liu> wrote:
>
> > 13.534e+10
>
> perl -e "print 13.534e+10"
> 135340000000
>
> perl -e "my $var = 13.534e+10; print length $var"
> 12
>
> So at least here (WinXP+ActiveState) Perl does this internally.
>

Thanks for your input, but try 13.534e+26, you will find perl prints
13.534e+26. It's part of the code
where it reads this number from a file and the output needs to be
converted to decimal format for another application (say myapp) to use.
Unfortunately, myapp only understands decimal format number.

12-14-06, 10:59 PM

J. Gleixner

Fei Liu wrote:
> John Bokma wrote:
>
> Thanks for your input, but try 13.534e+26, you will find perl prints
> 13.534e+26.

I find it prints 1.3534e+27

Look at: perldoc bigint

12-14-06, 11:01 PM

usenet

Fei Liu wrote:
> Thanks for your input, but try 13.534e+26, you will find perl prints
> 13.534e+26. It's part of the code

use Math::BigInt;
my $int = Math::BigInt->new('13.534e+26');
print $int->as_int();

#prints 1353400000000000000000000000

12-14-06, 11:04 PM

xhoster

usenet wrote:
> Fei Liu wrote:
> > Thanks for your input, but try 13.534e+26, you will find perl prints
> > 13.534e+26. It's part of the code
>
> use Math::BigInt;
> my $int = Math::BigInt->new('13.534e+26');
> print $int->as_int();

Or, if you don't mind there being some 9's way out at the end,

printf "%f", 13.534e26

Xho

12-14-06, 11:05 PM

usenet

use...@DavidFilmer.com wrote:
> my $int = Math::BigInt->new('13.534e+26');
> print $int->as_int();

Or, if you are just doing the one conversion and don't need to retain
the constructor:

print Math::BigInt->new('13.534e+26')->as_int();

12-14-06, 11:07 PM

John Bokma

"Fei Liu" <fei.liu> wrote:

> John Bokma wrote:
>
> Thanks for your input, but try 13.534e+26

So, you gave a bad example. Always make your problem description as
complete as possible and provide examples that show your specific problem.
This way people can help you better, and you don't waste a lot of time of
other people.

#10

12-14-06, 11:18 PM

Dr.Ruud

Fei Liu schreef:

> Hi group, is there a quick way to convert an exponential format
> number to decimal format number. For example,
>
> 13.534e+10 = 1353400000
>
> I can come up a perl function but it's not perly.

This works in a limited way:

perl -we 'printf "%.0f\n", q/9.64e+21/'
9640000000000000000000

#11

12-14-06, 11:21 PM

Fei Liu

On Dec 14, 6:07 pm, John Bokma <j> wrote:
> "Fei Liu" <fei> wrote:
>>
>> complete as possible and provide examples that show your specific problem.
> This way people can help you better, and you don't waste a lot of time of
> other people.
>
Your time is appreciated.

#12

12-14-06, 11:23 PM

Ch Lamprecht

usenet wrote:
> use...@DavidFilmer.com wrote:
>
>> my $int = Math::BigInt->new('13.534e+26');
>> print $int->as_int();
>> Or, if you are just doing the one conversion and don't need to retain
> the constructor:
>
> print Math::BigInt->new('13.534e+26')->as_int();

as_int returns a Math::BigInt object. We have one already.

print Math::BigInt->new('13.534e+26')

Christoph

#13

12-15-06, 01:26 AM

Tad McClellan

Fei Liu <fei.liu> wrote:
>
> John Bokma wrote:
>
> Thanks for your input, but try 13.534e+26, you will find perl prints
> 13.534e+26. It's part of the code
> where it reads this number from a file and the output needs to be
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Then it is not a number!

It is a string.

> converted to decimal format for another application (say myapp) to use.

Perl's regular expressions are handy for working on string data:

$str =~ s/\.(\d+)e[+](\d+)/ $1 . '0' x ($2 - length $1) /ie;

#14

12-15-06, 01:37 AM

John Bokma

Tad McClellan <tadmc> wrote:

>>> "Fei Liu" <fei.liu> wrote:
>>>
>>> > 13.534e+10

[..]

> $str =~ s/\.(\d+)e[+](\d+)/ $1 . '0' x ($2 - length $1) /ie;

nify :-D

#15

12-15-06, 02:48 PM

Fei Liu

On Dec 14, 8:26 pm, Tad McClellan <t> wrote:
> Fei Liu <fei> wrote:
>>
>>
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>
> Then it is not a number!
>
> It is a string.
>> $str =~ s/\.(\d+)e[+](\d+)/ . '0' x ( - length ) /ie;
>

This one is neat, I'll use it. Thanks!

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