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Document tonumber() enhancements.

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Mike Pall 2012-10-28 14:20:14 +01:00
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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>. in <tt>"-inf"</tt>.
</p> </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> <h3 id="string_dump"><tt>string.dump(f [,strip])</tt> generates portable bytecode</h3>
<p> <p>
An extra argument has been added to <tt>string.dump()</tt>. If set to 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 The PRNG generates the same sequences from the same seeds on all
platforms and makes use of all bits in the seed argument. platforms and makes use of all bits in the seed argument.
<tt>math.random()</tt> without arguments generates 52 pseudo-random bits <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 It's correctly scaled up and rounded for <tt>math.random(n&nbsp;[,m])</tt> to
preserve uniformity. preserve uniformity.
</p> </p>