Greetings everyone
I am trying to figure out which of the multiple rounding techniques is used by perl's (and I suspect C) printf. I can not find anything that matches on the interwebs. Can anyone explain in detail the output of the following oneliner:
perl -e 'printf "%s => %.1f\n", ("0.${_}5") x 2 for (0..9)'
0.05 => 0.1
0.15 => 0.1 <-- this pair precludes even/odd
0.25 => 0.2 <-- rounding as explanation
0.35 => 0.3
0.45 => 0.5 <-- looks like the threshold of down/up rounding behavior
0.55 => 0.6
0.65 => 0.7
0.75 => 0.8
0.85 => 0.8 <-- except not quite :(
0.95 => 0.9
-
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 How to display code and escape characters
are good places to start.
|