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Document tonumber() enhancements.

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Mike Pall 2012-10-28 14:20:14 +01:00
parent c7990063e0
commit 4e7fe815ed
1 changed files with 12 additions and 1 deletions
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doc/extensions.html
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@ -170,6 +170,17 @@ positive infinity results in <tt>"inf"</tt> and negative infinity results
in <tt>"-inf"</tt>.
</p>
<h3 id="tonumber"><tt>tonumber()</tt> etc. use builtin string to number conversion</h3>
<p>
All string-to-number conversions consistently convert integer and
floating-point inputs in decimal and hexadecimal on all platforms.
<tt>strtod()</tt> is <em>not</em> used anymore, which avoids numerous
problems with poor C library implementations. The builtin conversion
function provides full precision according to the IEEE-754 standard, it
works independently of the current locale and it supports hex floating-point
numbers (e.g. <tt>0x1.5p-3</tt>).
</p>
<h3 id="string_dump"><tt>string.dump(f [,strip])</tt> generates portable bytecode</h3>
<p>
An extra argument has been added to <tt>string.dump()</tt>. If set to
@ -198,7 +209,7 @@ implementation which uses the platform-specific ANSI rand().
The PRNG generates the same sequences from the same seeds on all
platforms and makes use of all bits in the seed argument.
<tt>math.random()</tt> without arguments generates 52 pseudo-random bits
for every call. The result is uniformly distributed between 0 and 1.
for every call. The result is uniformly distributed between 0.0 and 1.0.
It's correctly scaled up and rounded for <tt>math.random(n&nbsp;[,m])</tt> to
preserve uniformity.
</p>