decbin.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<!-- EN-Revision: 0c9c2dd669fe9395eaa73d487fbd160f9057429a Maintainer: hirokawa Status: ready -->
<!-- CREDITS: takagi,mumumu -->
<refentry xml:id="function.decbin" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>decbin</refname>
  <refpurpose>10 進数を 2 進数に変換する</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>string</type><methodname>decbin</methodname>
   <methodparam><type>int</type><parameter>num</parameter></methodparam>
  </methodsynopsis>
  <para>
   引数 <parameter>num</parameter> を 2 進数表現した文字列を返します。
  </para>
 </refsect1>
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>num</parameter></term>
     <listitem>
      <para>
       変換したい 10 進数値。
      </para>

      <table>
       <title>32 ビットマシンでの入力の範囲</title>
       <tgroup cols="3">
        <colspec colname="c1"/>
        <colspec colname="c2"/>
        <colspec colname="c3"/>
        <thead>
         <row>
          <entry>正の <parameter>num</parameter></entry>
          <entry>負の <parameter>num</parameter></entry>
          <entry>戻り値</entry>
         </row>
        </thead>
        <tbody>
         <row>
          <entry>0</entry>
          <entry/>
          <entry>0</entry>
         </row>
         <row>
          <entry>1</entry>
          <entry/>
          <entry>1</entry>
         </row>
         <row>
          <entry>2</entry>
          <entry/>
          <entry>10</entry>
         </row>
         <row>
          <entry namest="c1" nameend="c3">... normal progression ...</entry>
         </row>
         <row>
          <entry>2147483646</entry>
          <entry/>
          <entry>1111111111111111111111111111110</entry>
         </row>
         <row>
          <entry>2147483647 (符号付き integer の最大値)</entry>
          <entry/>
          <entry>1111111111111111111111111111111 (1 が 31 個)</entry>
         </row>
         <row>
          <entry>2147483648</entry>
          <entry>-2147483648</entry>
          <entry>10000000000000000000000000000000</entry>
         </row>
         <row>
          <entry namest="c1" nameend="c3">... normal progression ...</entry>
         </row>
         <row>
          <entry>4294967294</entry>
          <entry>-2</entry>
          <entry>11111111111111111111111111111110</entry>
         </row>
         <row>
          <entry>4294967295 (符号なし integer の最大値)</entry>
          <entry>-1</entry>
          <entry>11111111111111111111111111111111 (1 が 32 個)</entry>
         </row>
        </tbody>
       </tgroup>
      </table>

      <table>
       <title>64 ビットマシンでの入力の範囲</title>
       <tgroup cols="3">
        <colspec colname="c1"/>
        <colspec colname="c2"/>
        <colspec colname="c3"/>
        <thead>
         <row>
          <entry>正の <parameter>num</parameter></entry>
          <entry>負の <parameter>num</parameter></entry>
          <entry>戻り値</entry>
         </row>
        </thead>
        <tbody>
         <row>
          <entry>0</entry>
          <entry/>
          <entry>0</entry>
         </row>
         <row>
          <entry>1</entry>
          <entry/>
          <entry>1</entry>
         </row>
         <row>
          <entry>2</entry>
          <entry/>
          <entry>10</entry>
         </row>
         <row>
          <entry namest="c1" nameend="c3">... normal progression ...</entry>
         </row>
         <row>
          <entry>9223372036854775806</entry>
          <entry/>
          <entry>111111111111111111111111111111111111111111111111111111111111110</entry>
         </row>
         <row>
          <entry>9223372036854775807 (符号付き integer の最大値)</entry>
          <entry/>
          <entry>111111111111111111111111111111111111111111111111111111111111111 (1 が 63 個)</entry>
         </row>
         <row>
          <entry/>
          <entry>-9223372036854775808</entry>
          <entry>1000000000000000000000000000000000000000000000000000000000000000</entry>
         </row>
         <row>
          <entry namest="c1" nameend="c3">... normal progression ...</entry>
         </row>
         <row>
          <entry/>
          <entry>-2</entry>
          <entry>1111111111111111111111111111111111111111111111111111111111111110</entry>
         </row>
         <row>
          <entry/>
          <entry>-1</entry>
          <entry>1111111111111111111111111111111111111111111111111111111111111111 (1 が 64 個)</entry>
         </row>
        </tbody>
       </tgroup>
      </table>

     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   <parameter>num</parameter> を 2 進文字列で表した値を返します。
  </para>
 </refsect1>
 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>decbin</function> の例</title>
    <programlisting role="php">
<![CDATA[
<?php
echo decbin(12) . "\n";
echo decbin(26);
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
1100
11010
]]>
    </screen>
   </example>
  </para>
 </refsect1>
 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>bindec</function></member>
    <member><function>decoct</function></member>
    <member><function>dechex</function></member>
    <member><function>base_convert</function></member>
    <member>
     <function>printf</function> でのフォーマット <literal>%b</literal>、
     <literal>%032b</literal> あるいは <literal>%064b</literal>
    </member>
    <member>
     <function>sprintf</function> でのフォーマット <literal>%b</literal>、
     <literal>%032b</literal> あるいは <literal>%064b</literal>
    </member>
   </simplelist>
  </para>
 </refsect1>
</refentry>
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