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put overflow examples together, and division example on its own. fix typo and another dash.

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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@61232 c90b9560-bf6c-de11-be94-00142212c4b1
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jim winstead 2001-10-31 02:02:20 +00:00
parent df70f43a81
commit 4e18a599b0
1 changed files with 23 additions and 23 deletions
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46
language/types.xml
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@ -1,5 +1,5 @@
<?xml encoding="iso-8859-1"?>
<!-- $Revision: 1.57 $ -->
<!-- $Revision: 1.58 $ -->
<chapter id="language.types">
<title>Types</title>
@ -312,38 +312,26 @@ $a = 0x1A; # hexadecimal number (equivalent to 26 decimal)
<sect2 id="language.types.integer.overflow">
<title>Integer overflow</title>
<para>
If you specify a number beyond the bounds of the <type>integer</type> type,
it will be interpreted as a <type>float</type> instead.
</para>
<para>
In PHP there is also no such thing as integer division.
<literal>1/2</literal> yields the <type>float</type>
<literal>0.5</literal>. <!-- See ??? for more information. (with the
operators, or with type-jug) -->
If you specify a number beyond the bounds of the <type>integer</type>
type, it will be interpreted as a <type>float</type> instead. Also, if
you perform an operation that results in a number beyond the bounds of
the <type>integer</type> type, a <type>float</type> will be returned
instead.
<informalexample>
<programlisting role="php">
$large_number = 2147483647;
var_dump($large_number);
// output: int(2147483647)
$large_number = 2147483648;
var_dump($large_number);
// output: float(2147483648)
// this goes also for hexadecimal specified integers:
var_dump( 0x80000000 );
// output: float(2147483648)
var_dump( 25/7 );
// output: float(3.5714285714286)
</programlisting>
</informalexample>
Furthermore, if some function or operator yields a number that is beyond
the boundaries of <type>integer</type>, it will also
be automatically converted to
<type>float</type>.
<informalexample>
<programlisting role="php">
$million = 1000000;
$large_number = 50000 * $million;
var_dump($large_number);
@ -360,10 +348,22 @@ var_dump($large_number);
positive there is no problem.
</simpara>
<simpara>
This is solved in PHP 4.1.0
This is solved in PHP 4.1.0.
</simpara>
</warning>
</para>
<para>
There is no integer division operator in PHP.
<literal>1/2</literal> yields the <type>float</type>
<literal>0.5</literal>. <!-- See ??? for more information. (with the
operators, or with type-jug) -->
<informalexample>
<programlisting role="php">
var_dump( 25/7 );
// output: float(3.5714285714286)
</programlisting>
</informalexample>
</para>
</sect2>
@ -373,8 +373,8 @@ var_dump($large_number);
To explicitly convert a value to <type>integer</type>, use either
the <literal>(int)</literal> or the <literal>(integer)</literal> cast.
However, in most cases you do not need to use the cast, since a value
will be autmatically converted if an operator, function or
control structure requires a <type>integer</type>-argument.
will be automatically converted if an operator, function or
control structure requires a <type>integer</type> argument.
</simpara>
<simpara>
See also <link linkend="language.types.type-juggling">type-juggling</link>.