print flips to scientific notation when integer exceeds 15 decimal digits

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1.print flips to scientific notation when integer exceeds 15 decimal digits

Although I've used perl for many years, I've just been surprised (in the 
unpleasant sense) by a recent event.  Given a variable, say "$int", 
which is a growing integer, I would expect "print $int" to print it as a 
simple integer; indeed it usually does so.  But when its size takes it 
from 15 decimal digits to 16 decimal digits, that "print" flips the 
output into scientific notation:
    999999999999997
    999999999999998
    999999999999999
    1e+15
    1e+15

Ouch.  The surprise is especially nasty when this output data is then 
used as input data for another program that expects an integer.

This is consistent across a variety of OSes (although all perl 5.8.8).

I eventually managed to track down a way to achieve the desired result 
with a non-obvious "printf" format.  (I leave that, and its clear 
user-oriented explanation, as an exercise for the reader!)

I'm not aware of any documentation about this surprise. Is this a 
program bug or a documentation bug?  (Or a self bug?)

Is there a more appropriate forum than "beginners@..." to raise this?

-- 
: David Lee
: ECMWF (Data Handling System)
: Shinfield Park
: Reading  RG2 9AX
: Berkshire
:
: tel:    +44-118-9499 362
: email:   XXXX@XXXXX.COM 

2.Convert Scientific Notation to decimal equivalent

How can I detect this, I have been running some code for a few days to develop some files and ran into the situation where I am getting the following data for input:

14.95313 14.45312 0
14.95313 1.570813E-015 0
14.95313 -14.45313 0
-14.95313 -28.90625 0
-14.95313 -14.45313 0
-14.95313 1.570813E-015 0
-14.95313 14.45312 0
14.95313 -28.90625 0
0 -28.90625 0
-14.95313 28.90625 0
0 28.90625 0
14.95313 28.90625 0

And my code is skipping some lines as it checks for any erroneous data:
next if grep (/[^0-9.-]/, @data);
But that thinks the scientific notation is bad. I searched the net and didn't find anything. How can I match this specific pattern and convert it?

Thanks!
jlc

3.Number with More then 15 Digits.

 
Hi 

$a = 1234567890123456789; 
printf ("%0.0f\n", $a);

Out Put is 
1234567890123456800

which is wrong can any one let me know how do we handle 
Digits More than 15 digits ..

Regards
Govardhan MV

4.Newbie quesion: Scientific notation

Anno Siegel wrote:
> < XXXX@XXXXX.COM > wrote in comp.lang.perl.misc:
> > Hi,
> >
> > I'm trying to upload some data into a MySQL database.
> >
> > Could someone please advise me how I handle scientific notation?
> >
> > What I have sofar:
> >
> > -------
> > The data (pt, x)
> >
> > P1   4.50015068000000D-004
> > -------
> >
> > My regex expressions, I've been experimenting with:
> >
> > regex1: P\d+\s+(-?([0-9]+(\.[0-9]*)?|\.[0-9]+))/)
>           ^                                      ^^
> Are these supposed to be regex delimiters?
>
> > does not catch the scientific notation
>
> Of course not.  What makes you think it would?
>
> > regex2: P\d+\s+([+-]?(\d+(\.\d*)?|\.\d+)([eEdD][+-]?\d+))/)
> > does catch the scientific notation.  I then say,
> > $number = $1;
>
> For matching numbers with regular expressions, see perldoc -q "is a
number".
> Follow the pointers you find there.
Ah, this helps alot thanks!  I just didn't find that before.
>
> > -------
> > # Insert data
> > $dbh->do("INSERT INTO data(x) VALUES (?)",undef, $number);
> > -------
> >
> > How do I upload the number to the database?  If I do it as above it
is
> > incorrect.
>
> Incorrect how?  Is the data rejected by the database?  Is it accepted
> but not the values you expect it to be?  Be specific.
Well the number it uploads is not the float, in this case double, that
I want it to be.  I'll need to do a strtod.
> 
> Anno
Martin.

5.Newbie quesion: Scientific notation

Hi,

I'm trying to upload some data into a MySQL database.

Could someone please advise me how I handle scientific notation?

What I have sofar:

-------
The data (pt, x)

P1   4.50015068000000D-004
-------

My regex expressions, I've been experimenting with:

regex1: P\d+\s+(-?([0-9]+(\.[0-9]*)?|\.[0-9]+))/)
does not catch the scientific notation

regex2: P\d+\s+([+-]?(\d+(\.\d*)?|\.\d+)([eEdD][+-]?\d+))/)
does catch the scientific notation.  I then say,
$number = $1;

-------
# Insert data
$dbh->do("INSERT INTO data(x) VALUES (?)",undef, $number);
-------

How do I upload the number to the database?  If I do it as above it is
incorrect.

Thanks your help.

Martin.

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