Beefy Boxes and Bandwidth Generously Provided by pair Networks
P is for Practical
 
PerlMonks  

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
I've rewritten your code into a form that I think makes at least some sense:
use strict; use warnings; my $amt = 4887.15; print " Checking amnt before conversion $amt,\n"; $amt= sprintf("%.2f",$amt); print " Checking amnt after rounding $amt,\n"; $amt = $amt*100; print " Checking amnt after conversion $amt,\n"; printf "Checking the EXACT value of amnt: %.17g\n", $amt; amnt($amt); sub amnt { my $amount=$_[0]; $amount=int($amount); print "$amount i m checking amount before padding,\n"; #my $padamnt = sprintf("%016.0f",$amount);---> currently commented to +check integer effect. my $padamnt = sprintf("%016d",$amount); print "$padamnt i m checking amount after padding,\n"; return $padamnt; }
When I run that script, I get:
Checking amnt before conversion 4887.15, Checking amnt after rounding 4887.15, Checking amnt after conversion 488715, Checking the EXACT value of amnt: 488714.99999999994 488714 i m checking amount before padding, 0000000000488714 i m checking amount after padding,
Note that I've added a line of code that demonstrates that the EXACT value of $amt is NOT 488715.
Perl's print() function frequently fails to produce an accurate representation of floating point values - and that's what is happening here.

That output I'm seeing is as I expect.
Which is the line of output that you don't understand ?

You need to stay alert to this aspect of perl's print() function.
Neither python3 nor raku are afflicted with such a poorly designed implementation:
$ python3 -c "print(4887.15 * 100)" 488714.99999999994 $ raku -e "say 4887.15e0 * 100" 488714.99999999994


Cheers,
Rob

In reply to Re^3: Padding with sprintf changing number by syphilis
in thread Padding with sprintf changing number by sachin raj aryan

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or or How to display code and escape characters are good places to start.
Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others wandering the Monastery: (2)
As of 2022-05-21 06:47 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    Do you prefer to work remotely?



    Results (76 votes). Check out past polls.

    Notices?