Изворни код странице Шаблон:Rndpad/док

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The rounding routine '''Template:Rndpad''' can round up to 85 billion as 11-digit format, with decimals padded by trailing zeroes, when the round setting > -11, but can display [[scientific notation]] above 85 billion (8.5E+10) for any number of digits.

=== Usage ===
: <nowiki>{{rndpad|7.58|1}}</nowiki> &rarr; 7.6
: <nowiki>{{rndpad|7001.58|0}}</nowiki> &rarr; 7002
: <nowiki>{{rndpad|9730070681.45003|-3}}</nowiki> &rarr; 9730071000
: <nowiki>{{rndpad|9730070681.45003|4}}</nowiki> &rarr; 9730070681.4500
: <nowiki>{{rndpad|9000000000.40|0}}</nowiki> &rarr; {{rndpad|9000000000.40|0}}
: <nowiki>{{rndpad|90000000000.40|0}}</nowiki> &rarr; {{rndpad|90000000000.40|0}}
: <nowiki>{{rndpad|70000000000.40|0}}</nowiki> &rarr; {{rndpad|70000000000.40|0}}
: <nowiki>{{rndpad|678912|-5}}</nowiki> &rarr; {{rndpad|678912|-5}}

===Detailed examples===
: Examples of rounding to each of 6-12 digits:
:* <nowiki>{{rndpad|90711.45003| -4 }}</nowiki> &nbsp; &rarr; {{rndpad|90711.45003| -4 }}
:* <nowiki>{{rndpad|79730000006.40|0}}</nowiki> &nbsp; &rarr; {{rndpad|79730000006.40|0}}
:* <nowiki>{{rndpad|999999| -1}}</nowiki> &nbsp; &rarr; {{rndpad|999999| -1}}
:* <nowiki>{{rndpad|84999000000.3| 0}}</nowiki> &nbsp; &rarr; {{rndpad|84999000000.3| 0}}
:* <nowiki>{{rndpad|85000000000.3| 0}}</nowiki> &nbsp; &rarr; {{rndpad|85000000000.3| 0}}
:* <nowiki>{{rndpad|84873000000.3| -8}}</nowiki> &nbsp; &rarr; {{rndpad|84873000000.3| -8}}
:* <nowiki>{{rndpad|80561.45003| -5 }}</nowiki> &nbsp; &rarr; {{rndpad|80561.45003| -5 }}
:* <nowiki>{{rndpad|80561.45003| -4 }}</nowiki> &nbsp; &rarr; {{rndpad|80561.45003| -4 }}
:* <nowiki>{{rndpad|80561.45003| -3 }}</nowiki> &nbsp; &rarr; {{rndpad|80561.45003| -3 }}
:* <nowiki>{{rndpad|80561.45003| -2 }}</nowiki> &nbsp; &rarr; {{rndpad|80561.45003| -2 }}
:* <nowiki>{{rndpad|80561.45003| -1 }}</nowiki> &nbsp; &rarr; {{rndpad|80561.45003| -1 }}
:* <nowiki>{{rndpad|80561.45003| 0 }}</nowiki> &nbsp; &rarr; {{rndpad|80561.45003| 0 }}
:* <nowiki>{{rndpad|80561.45003| 1 }}</nowiki> &nbsp; &rarr; {{rndpad|80561.45003| 1 }}
:* <nowiki>{{rndpad|80561.45003| 2 }}</nowiki> &nbsp; &rarr; {{rndpad|80561.45003| 2 }}
:* <nowiki>{{rndpad|80561.45003| 3 }}</nowiki> &nbsp; &rarr; {{rndpad|80561.45003| 3 }}
:* <nowiki>{{rndpad|80561.45003| 4 }}</nowiki> &nbsp; &rarr; {{rndpad|80561.45003| 4 }}
:* <nowiki>{{rndpad|80561.45003| 5 }}</nowiki> &nbsp; &rarr; {{rndpad|80561.45003| 5 }}
:* <nowiki>{{rndpad|80561.45003| 6 }}</nowiki> &nbsp; &rarr; {{rndpad|80561.45003| 6 }}

===Technical issues===
The [[Template:Rndpad]] avoids subtemplates when rounding to whole integer amounts, and uses only one subtemplate, {{tl|rnd/-}}, when rounding decimal portions of numbers below 85 billion. In those cases, the internal markup coding is nested only 3 levels deep, of nested-if expressions. However, for numbers over 85 billion, up to 8 subtemplates are invoked, and the nesting level can be more than 12 levels deep. Inside a single page, invoking {{tl|rndpad}} uses only 1 level of nesting, so an if-expression could be nested 39 levels deep, and then invoke rndpad as the 40th-level of nesting. However, inside an infobox, the depth-limit message might be announced as ''"Expansion depth limit exceeded"'' at 41 levels.

Internally, {Rndpad} uses math function floor(x) or "x [[modular arithmetic|mod]] n" to truncate decimal digits; however, to bypass a system-math bug, the template adds 1E-9 (x+0.000000001) to the amount before using floor(x) or "x mod n". If that math bug is fixed, the result should still calculate correctly.

=== See also ===
* {{tlx|rnd|amount|n}} - round amount, allow scientific notation at 8.0E+5
* {{tlx|rnd/-|amount|n}} - round a decimal padded with trailing zeroes

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