mirror of
https://github.com/php/doc-ja.git
synced 2026-04-24 08:28:13 +02:00
Saki Takamachi
292 lines
8.6 KiB
XML
292 lines
8.6 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<!-- EN-Revision: 15b93836d93f01ea6d90a68cacf04ce0d9fb8eff Maintainer: saki Status: ready -->
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<refentry xml:id="function.bcround" xmlns="http://docbook.org/ns/docbook" xmlns:xi="http://www.w3.org/2001/XInclude">
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<refnamediv>
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<refname>bcround</refname>
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<refpurpose>任意精度数値を丸める</refpurpose>
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<methodsynopsis>
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<type>string</type><methodname>bcround</methodname>
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<methodparam><type>string</type><parameter>num</parameter></methodparam>
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<methodparam choice="opt"><type>int</type><parameter>precision</parameter><initializer>0</initializer></methodparam>
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<methodparam choice="opt"><type>RoundingMode</type><parameter>mode</parameter><initializer>RoundingMode::HalfAwayFromZero</initializer></methodparam>
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</methodsynopsis>
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<simpara>
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<parameter>num</parameter> を、指定した <parameter>precision</parameter>(小数点以下の桁数)に丸めた値を返します。
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<parameter>precision</parameter> を負またはゼロ(デフォルト) とすることも可能です。
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</simpara>
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</refsect1>
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<refsect1 role="parameters">
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&reftitle.parameters;
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<variablelist>
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<xi:include xpointer="xmlns(db=http://docbook.org/ns/docbook) xpointer(id('function.round')/db:refsect1[@role='parameters']/descendant::db:varlistentry[1])" />
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<xi:include xpointer="xmlns(db=http://docbook.org/ns/docbook) xpointer(id('function.round')/db:refsect1[@role='parameters']/descendant::db:varlistentry[2])" />
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<xi:include xpointer="bcmath-number.round..parameters.mode" />
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</variablelist>
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</refsect1>
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<simpara>
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<parameter>num</parameter> を指定された精度へ丸めた数値を表す文字列を返します。
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</simpara>
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</refsect1>
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<refsect1 role="errors">
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&reftitle.errors;
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<para>
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この関数は、以下の場合に <classname>ValueError</classname> をスローします:
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<simplelist>
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<member><parameter>num</parameter> が、BCMath で有効でない数値形式の文字列である場合</member>
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<member>無効な <parameter>mode</parameter> を指定した場合</member>
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</simplelist>
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</para>
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</refsect1>
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<refsect1 role="examples">
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&reftitle.examples;
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<example>
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<title><function>bcround</function> の例</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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var_dump(bcround('3.4'));
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var_dump(bcround('3.5'));
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var_dump(bcround('3.6'));
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var_dump(bcround('3.6', 0));
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var_dump(bcround('5.045', 2));
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var_dump(bcround('5.055', 2));
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var_dump(bcround('345', -2));
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var_dump(bcround('345', -3));
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var_dump(bcround('678', -2));
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var_dump(bcround('678', -3));
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?>
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]]>
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</programlisting>
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&example.outputs;
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<screen role="php">
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<![CDATA[
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string(1) "3"
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string(1) "4"
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string(1) "4"
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string(1) "4"
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string(4) "5.05"
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string(4) "5.06"
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string(3) "300"
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string(1) "0"
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string(3) "700"
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string(4) "1000"
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]]>
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</screen>
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</example>
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<example>
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<title>
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<function>bcround</function> で異なる <parameter>precision</parameter> を指定した例
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</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$number = '123.45';
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var_dump(bcround($number, 3));
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var_dump(bcround($number, 2));
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var_dump(bcround($number, 1));
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var_dump(bcround($number, 0));
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var_dump(bcround($number, -1));
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var_dump(bcround($number, -2));
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var_dump(bcround($number, -3));
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?>
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]]>
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</programlisting>
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&example.outputs;
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<screen role="php">
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<![CDATA[
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string(7) "123.450"
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string(6) "123.45"
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string(5) "123.5"
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string(3) "123"
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string(3) "120"
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string(3) "100"
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string(1) "0"
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]]>
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</screen>
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</example>
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<example>
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<title>
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<function>bcround</function> で異なる <parameter>mode</parameter> を指定した例
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</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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echo 'Rounding modes with 9.5' . PHP_EOL;
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var_dump(bcround('9.5', 0, RoundingMode::HalfAwayFromZero));
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var_dump(bcround('9.5', 0, RoundingMode::HalfTowardsZero));
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var_dump(bcround('9.5', 0, RoundingMode::HalfEven));
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var_dump(bcround('9.5', 0, RoundingMode::HalfOdd));
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var_dump(bcround('9.5', 0, RoundingMode::TowardsZero));
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var_dump(bcround('9.5', 0, RoundingMode::AwayFromZero));
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var_dump(bcround('9.5', 0, RoundingMode::NegativeInfinity));
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var_dump(bcround('9.5', 0, RoundingMode::PositiveInfinity));
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echo PHP_EOL;
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echo 'Rounding modes with 8.5' . PHP_EOL;
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var_dump(bcround('8.5', 0, RoundingMode::HalfAwayFromZero));
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var_dump(bcround('8.5', 0, RoundingMode::HalfTowardsZero));
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var_dump(bcround('8.5', 0, RoundingMode::HalfEven));
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var_dump(bcround('8.5', 0, RoundingMode::HalfOdd));
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var_dump(bcround('8.5', 0, RoundingMode::TowardsZero));
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var_dump(bcround('8.5', 0, RoundingMode::AwayFromZero));
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var_dump(bcround('8.5', 0, RoundingMode::NegativeInfinity));
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var_dump(bcround('8.5', 0, RoundingMode::PositiveInfinity));
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?>
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]]>
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</programlisting>
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&example.outputs;
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<screen role="php">
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<![CDATA[
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Rounding modes with 9.5
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string(2) "10"
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string(1) "9"
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string(2) "10"
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string(1) "9"
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string(1) "9"
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string(2) "10"
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string(1) "9"
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string(2) "10"
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Rounding modes with 8.5
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string(1) "9"
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string(1) "8"
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string(1) "8"
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string(1) "9"
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string(1) "8"
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string(1) "9"
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string(1) "8"
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string(1) "9"
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]]>
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</screen>
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</example>
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<example>
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<title>
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<function>bcround</function> で <parameter>precision</parameter> を指定し、
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異なる <parameter>mode</parameter> を指定した例
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</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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echo 'Using RoundingMode::HalfAwayFromZero with 1 decimal digit precision' . PHP_EOL;
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var_dump(bcround( 1.55, 1, RoundingMode::HalfAwayFromZero));
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var_dump(bcround(-1.55, 1, RoundingMode::HalfAwayFromZero));
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echo PHP_EOL;
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echo 'Using RoundingMode::HalfTowardsZero with 1 decimal digit precision' . PHP_EOL;
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var_dump(bcround( 1.55, 1, RoundingMode::HalfTowardsZero));
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var_dump(bcround(-1.55, 1, RoundingMode::HalfTowardsZero));
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echo PHP_EOL;
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echo 'Using RoundingMode::HalfEven with 1 decimal digit precision' . PHP_EOL;
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var_dump(bcround( 1.55, 1, RoundingMode::HalfEven));
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var_dump(bcround(-1.55, 1, RoundingMode::HalfEven));
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echo PHP_EOL;
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echo 'Using RoundingMode::HalfOdd with 1 decimal digit precision' . PHP_EOL;
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var_dump(bcround( 1.55, 1, RoundingMode::HalfOdd));
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var_dump(bcround(-1.55, 1, RoundingMode::HalfOdd));
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echo PHP_EOL;
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echo 'Using RoundingMode::TowardsZero with 1 decimal digit precision' . PHP_EOL;
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var_dump(bcround( 1.55, 1, RoundingMode::TowardsZero));
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var_dump(bcround(-1.55, 1, RoundingMode::TowardsZero));
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echo PHP_EOL;
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echo 'Using RoundingMode::AwayFromZero with 1 decimal digit precision' . PHP_EOL;
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var_dump(bcround( 1.55, 1, RoundingMode::AwayFromZero));
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var_dump(bcround(-1.55, 1, RoundingMode::AwayFromZero));
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echo PHP_EOL;
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echo 'Using RoundingMode::NegativeInfinity with 1 decimal digit precision' . PHP_EOL;
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var_dump(bcround( 1.55, 1, RoundingMode::NegativeInfinity));
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var_dump(bcround(-1.55, 1, RoundingMode::NegativeInfinity));
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echo PHP_EOL;
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echo 'Using RoundingMode::PositiveInfinity with 1 decimal digit precision' . PHP_EOL;
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var_dump(bcround( 1.55, 1, RoundingMode::PositiveInfinity));
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var_dump(bcround(-1.55, 1, RoundingMode::PositiveInfinity));
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?>
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]]>
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</programlisting>
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&example.outputs;
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<screen role="php">
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<![CDATA[
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Using RoundingMode::HalfAwayFromZero with 1 decimal digit precision
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string(3) "1.6"
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string(4) "-1.6"
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Using RoundingMode::HalfTowardsZero with 1 decimal digit precision
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string(3) "1.5"
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string(4) "-1.5"
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Using RoundingMode::HalfEven with 1 decimal digit precision
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string(3) "1.6"
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string(4) "-1.6"
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Using RoundingMode::HalfOdd with 1 decimal digit precision
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string(3) "1.5"
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string(4) "-1.5"
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Using RoundingMode::TowardsZero with 1 decimal digit precision
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string(3) "1.5"
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string(4) "-1.5"
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Using RoundingMode::AwayFromZero with 1 decimal digit precision
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string(3) "1.6"
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string(4) "-1.6"
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Using RoundingMode::NegativeInfinity with 1 decimal digit precision
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string(3) "1.5"
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string(4) "-1.6"
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Using RoundingMode::PositiveInfinity with 1 decimal digit precision
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string(3) "1.6"
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string(4) "-1.5"
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]]>
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</screen>
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</example>
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</refsect1>
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<refsect1 role="seealso">
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&reftitle.seealso;
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<simplelist>
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<member><function>bcceil</function></member>
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<member><function>bcfloor</function></member>
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<member><methodname>BcMath\Number::round</methodname></member>
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</simplelist>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"~/.phpdoc/manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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