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<?xml version="1.0" encoding="ISO-8859-1"?>
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-->
<refentry id="fn_iszero">
<refmeta>
<refentrytitle>iszero</refentrytitle>
<refmiscinfo>type</refmiscinfo>
<refmiscinfo>number</refmiscinfo>
</refmeta>
<refnamediv>
<refname>iszero</refname>
<refpurpose>returns true if argument is numeric zero</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis id="fsyn_iszero">
<funcprototype id="fproto_iszero">
<funcdef><function>iszero</function></funcdef>
<paramdef><parameter>arg</parameter> any</paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1 id="desc_iszero"><title>Description</title>
<para> iszero returns one if its argument is an integer 0, a float 0.0 or a
double 0.0 For any other arguments, of whatever type, it will return zero.
</para>
<screen>
iszero(0) -> 1 (Yes it is)
iszero(0.0) -> 1 (Double precision zero also
is a zero)
iszero(atof('0.0')) -> 1 (As well as single
precision floating point)
iszero(1) -> 0 (No, it's not)
iszero('Cifra') -> 0 (neither is this one)
iszero(NULL) -> 0 (nor this one)
</screen>
</refsect1>
</refentry>
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