I'd prefer to always have one internal representation of these numbers, and only change the visual representation on request to the current choice. That way I'd avoid this issue, and also I wouldn't have to worry about accummulating errors.
To capture the previous value, is a variant of capturing the current value. In sub change_unit you keep the old choice. When entering that sub, you have a new choice in $dtm_unit, and you have the old in your sub, or in a global, and you can recalculate from old to new, and set $old_unit = $dtm_unit; for use next time.
-
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.
|