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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>libqalculate-0.9.6: Prefix Class Reference</title>
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<h1>Prefix Class Reference</h1><!-- doxytag: class=<Prefix> -->Abstract class for prefixes.
<a href="#_details">More...</a>
<p>
<code>#include <Prefix.h></code>
<p>
<p>Inheritance diagram for Prefix:
<p><center><img src="classPrefix.png" usemap="#Prefix_map" border="0" alt=""></center>
<map name="Prefix_map">
<area href="classBinaryPrefix.html" alt="BinaryPrefix" shape="rect" coords="0,56,90,80">
<area href="classDecimalPrefix.html" alt="DecimalPrefix" shape="rect" coords="100,56,190,80">
<area href="classNumberPrefix.html" alt="NumberPrefix" shape="rect" coords="200,56,290,80">
</map>
<a href="classPrefix-members.html">List of all members.</a><table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classPrefix.html#a0">Prefix</a> (string long_name, string short_name="", string unicode_name="")</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">const string & </td><td class="memItemRight" valign="bottom"><a class="el" href="classPrefix.html#a2">shortName</a> (bool return_long_if_no_short=true, bool use_unicode=false) const </td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">const string & </td><td class="memItemRight" valign="bottom"><a class="el" href="classPrefix.html#a3">longName</a> (bool return_short_if_no_long=true, bool use_unicode=false) const </td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">const string & </td><td class="memItemRight" valign="bottom"><a class="el" href="classPrefix.html#a4">unicodeName</a> (bool return_short_if_no_uni=true) const </td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classPrefix.html#a5">setShortName</a> (string short_name)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classPrefix.html#a6">setLongName</a> (string long_name)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classPrefix.html#a7">setUnicodeName</a> (string unicode_name)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">const string & </td><td class="memItemRight" valign="bottom"><a class="el" href="classPrefix.html#a8">name</a> (bool short_default=true, bool use_unicode=false, bool(*can_display_unicode_string_function)(const char *, void *)=NULL, void *can_display_unicode_string_arg=NULL) const </td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual <a class="el" href="classNumber.html">Number</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classPrefix.html#a9">value</a> (const <a class="el" href="classNumber.html">Number</a> &nexp) const =0</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual <a class="el" href="classNumber.html">Number</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classPrefix.html#a10">value</a> (int iexp) const =0</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual <a class="el" href="classNumber.html">Number</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classPrefix.html#a11">value</a> () const =0</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual int </td><td class="memItemRight" valign="bottom"><a class="el" href="classPrefix.html#a12">type</a> () const =0</td></tr>
<tr><td colspan="2"><br><h2>Protected Attributes</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="p0"></a><!-- doxytag: member=<Prefix::l_name> ref=<p0> args=<> -->
string </td><td class="memItemRight" valign="bottom"><b>l_name</b></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="p1"></a><!-- doxytag: member=<Prefix::s_name> ref=<p1> args=<> -->
string </td><td class="memItemRight" valign="bottom"><b>s_name</b></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="p2"></a><!-- doxytag: member=<Prefix::u_name> ref=<p2> args=<> -->
string </td><td class="memItemRight" valign="bottom"><b>u_name</b></td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
Abstract class for prefixes.
<p>
A prefix is prepended to a unit to specificy a quantity multiplicator. A prefix has a numerical value which raised to the units power defines the quantity. In for example the expression "3 kilometers", meter is the unit, 3 is regular quantity, and kilo is a prefix with a value 1000, thus the example equals "3000 meters". If the unit instead had been squared, the value of the prefix would have been raised by two and the total quantity would have been 3.000.000.<p>
Prefixes can have up to free different three names -- a long name, a short name and a short unicode name. The unicode name is an alternative to the short name that is preferred if unicode characters can be displayed. The names or used to reference the prefix in mathematical expressions and to display a prefix in a result.
<p>
<hr><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" name="a0"></a><!-- doxytag: member=<Prefix::Prefix> ref=<a0> args=<(string long_name, string short_name="", string unicode_name="")> --><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">Prefix::Prefix </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">string </td>
<td class="mdname" nowrap> <em>long_name</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>string </td>
<td class="mdname" nowrap> <em>short_name</em> = <code>""</code>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>string </td>
<td class="mdname" nowrap> <em>unicode_name</em> = <code>""</code></td>
</tr>
<tr>
<td class="md"></td>
<td class="md">) </td>
<td class="md" colspan="2"></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Create a prefix.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>long_name</em> </td><td>Long name. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>short_name</em> </td><td>Short name. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>unicode_name</em> </td><td>Unicode name.</td></tr>
</table>
</dl>
</td>
</tr>
</table>
<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="a3"></a><!-- doxytag: member=<Prefix::longName> ref=<a3> args=<(bool return_short_if_no_long=true, bool use_unicode=false) const > --><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">const string& Prefix::longName </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">bool </td>
<td class="mdname" nowrap> <em>return_short_if_no_long</em> = <code>true</code>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>bool </td>
<td class="mdname" nowrap> <em>use_unicode</em> = <code>false</code></td>
</tr>
<tr>
<td class="md"></td>
<td class="md">) </td>
<td class="md" colspan="2"> const</td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Returns the long name of the prefix.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>return_short_if_no_long</em> </td><td>If the short name shall be returned if the prefix has not got a long name (if it is empty). </td></tr>
<tr><td valign="top"></td><td valign="top"><em>use_unicode</em> </td><td>If a unicode version of the name is allowed and preferred. </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>The long name of the prefix.</dd></dl>
</td>
</tr>
</table>
<a class="anchor" name="a8"></a><!-- doxytag: member=<Prefix::name> ref=<a8> args=<(bool short_default=true, bool use_unicode=false, bool(*can_display_unicode_string_function)(const char *, void *)=NULL, void *can_display_unicode_string_arg=NULL) const > --><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">const string& Prefix::name </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">bool </td>
<td class="mdname" nowrap> <em>short_default</em> = <code>true</code>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>bool </td>
<td class="mdname" nowrap> <em>use_unicode</em> = <code>false</code>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>bool(*)(const char *, void *) </td>
<td class="mdname" nowrap> <em>can_display_unicode_string_function</em> = <code>NULL</code>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>void * </td>
<td class="mdname" nowrap> <em>can_display_unicode_string_arg</em> = <code>NULL</code></td>
</tr>
<tr>
<td class="md"></td>
<td class="md">) </td>
<td class="md" colspan="2"> const</td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Returns a preferred name of the prefix.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>short_default</em> </td><td>If a short name is preferred. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>use_unicode</em> </td><td>If a unicode name is preferred. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>can_display_unicode_string_function</em> </td><td>Function that tests if the unicode characters in a name can be displayed. If the function returns false, the name will be rejected. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>can_display_unicode_string_arg</em> </td><td><a class="el" href="classArgument.html">Argument</a> to pass to the above test function. </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>A preferred name.</dd></dl>
</td>
</tr>
</table>
<a class="anchor" name="a6"></a><!-- doxytag: member=<Prefix::setLongName> ref=<a6> args=<(string long_name)> --><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">void Prefix::setLongName </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">string </td>
<td class="mdname1" valign="top" nowrap> <em>long_name</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Sets the long name of the prefix.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>long_name</em> </td><td>The new long name for the prefix.</td></tr>
</table>
</dl>
</td>
</tr>
</table>
<a class="anchor" name="a5"></a><!-- doxytag: member=<Prefix::setShortName> ref=<a5> args=<(string short_name)> --><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">void Prefix::setShortName </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">string </td>
<td class="mdname1" valign="top" nowrap> <em>short_name</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Sets the short name of the prefix.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>short_name</em> </td><td>The new short name for the prefix.</td></tr>
</table>
</dl>
</td>
</tr>
</table>
<a class="anchor" name="a7"></a><!-- doxytag: member=<Prefix::setUnicodeName> ref=<a7> args=<(string unicode_name)> --><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">void Prefix::setUnicodeName </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">string </td>
<td class="mdname1" valign="top" nowrap> <em>unicode_name</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Sets the unicode name of the prefix. The unicode name is an alternative to the short name that is preferred if unicode characters can be displayed.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>unicode_name</em> </td><td>The new unicode name for the prefix.</td></tr>
</table>
</dl>
</td>
</tr>
</table>
<a class="anchor" name="a2"></a><!-- doxytag: member=<Prefix::shortName> ref=<a2> args=<(bool return_long_if_no_short=true, bool use_unicode=false) const > --><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">const string& Prefix::shortName </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">bool </td>
<td class="mdname" nowrap> <em>return_long_if_no_short</em> = <code>true</code>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>bool </td>
<td class="mdname" nowrap> <em>use_unicode</em> = <code>false</code></td>
</tr>
<tr>
<td class="md"></td>
<td class="md">) </td>
<td class="md" colspan="2"> const</td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Returns the short name of the prefix.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>return_long_if_no_short</em> </td><td>If the long name shall be returned if the prefix has not got a short name (if it is empty). </td></tr>
<tr><td valign="top"></td><td valign="top"><em>use_unicode</em> </td><td>If a unicode version of the name is allowed and preferred. </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>The short name of the prefix.</dd></dl>
</td>
</tr>
</table>
<a class="anchor" name="a12"></a><!-- doxytag: member=<Prefix::type> ref=<a12> args=<() const =0> --><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">virtual int Prefix::type </td>
<td class="md" valign="top">( </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap> const<code> [pure virtual]</code></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Returns type, subclass, of the prefix. This can be PREFIX_DECIMAL for prefixes of the class <a class="el" href="classDecimalPrefix.html">DecimalPrefix</a>, PREFIX_BINARY for <a class="el" href="classBinaryPrefix.html">BinaryPrefix</a>, or PREFIX_NUMBER for <a class="el" href="classNumberPrefix.html">NumberPrefix</a>.<p>
<dl compact><dt><b>Returns:</b></dt><dd>The type of the prefix.</dd></dl>
<p>
Implemented in <a class="el" href="classDecimalPrefix.html#a8">DecimalPrefix</a>, <a class="el" href="classBinaryPrefix.html#a8">BinaryPrefix</a>, and <a class="el" href="classNumberPrefix.html#a6">NumberPrefix</a>. </td>
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<a class="anchor" name="a4"></a><!-- doxytag: member=<Prefix::unicodeName> ref=<a4> args=<(bool return_short_if_no_uni=true) const > --><p>
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<td class="md" nowrap valign="top">const string& Prefix::unicodeName </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">bool </td>
<td class="mdname1" valign="top" nowrap> <em>return_short_if_no_uni</em> = <code>true</code> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap> const</td>
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</td>
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<td>
</td>
<td>
<p>
Returns the unicode name of the prefix.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>return_short_if_no_uni</em> </td><td>If the short name shall be returned if the prefix has not got a unicode name (if it is empty). </td></tr>
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</dl>
<dl compact><dt><b>Returns:</b></dt><dd>The unicode name of the prefix.</dd></dl>
</td>
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<a class="anchor" name="a11"></a><!-- doxytag: member=<Prefix::value> ref=<a11> args=<() const =0> --><p>
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<td class="md" nowrap valign="top">virtual <a class="el" href="classNumber.html">Number</a> Prefix::value </td>
<td class="md" valign="top">( </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap> const<code> [pure virtual]</code></td>
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</td>
</tr>
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<table cellspacing="5" cellpadding="0" border="0">
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<td>
</td>
<td>
<p>
Returns the value of the prefix.<p>
<dl compact><dt><b>Returns:</b></dt><dd>The value of the prefix.</dd></dl>
<p>
Implemented in <a class="el" href="classDecimalPrefix.html#a7">DecimalPrefix</a>, <a class="el" href="classBinaryPrefix.html#a7">BinaryPrefix</a>, and <a class="el" href="classNumberPrefix.html#a5">NumberPrefix</a>. </td>
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</table>
<a class="anchor" name="a10"></a><!-- doxytag: member=<Prefix::value> ref=<a10> args=<(int iexp) const =0> --><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
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<table cellpadding="0" cellspacing="0" border="0">
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<td class="md" nowrap valign="top">virtual <a class="el" href="classNumber.html">Number</a> Prefix::value </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">int </td>
<td class="mdname1" valign="top" nowrap> <em>iexp</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap> const<code> [pure virtual]</code></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Returns the value of the prefix.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>iexp</em> </td><td>The power of the prefixed unit. </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>The value of the prefix.</dd></dl>
<p>
Implemented in <a class="el" href="classDecimalPrefix.html#a6">DecimalPrefix</a>, <a class="el" href="classBinaryPrefix.html#a6">BinaryPrefix</a>, and <a class="el" href="classNumberPrefix.html#a4">NumberPrefix</a>. </td>
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<a class="anchor" name="a9"></a><!-- doxytag: member=<Prefix::value> ref=<a9> args=<(const Number &nexp) const =0> --><p>
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<table cellpadding="0" cellspacing="0" border="0">
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<td class="md" nowrap valign="top">virtual <a class="el" href="classNumber.html">Number</a> Prefix::value </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const <a class="el" href="classNumber.html">Number</a> & </td>
<td class="mdname1" valign="top" nowrap> <em>nexp</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap> const<code> [pure virtual]</code></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Returns the value of the prefix.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>nexp</em> </td><td>The power of the prefixed unit. </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>The value of the prefix.</dd></dl>
<p>
Implemented in <a class="el" href="classDecimalPrefix.html#a5">DecimalPrefix</a>, <a class="el" href="classBinaryPrefix.html#a5">BinaryPrefix</a>, and <a class="el" href="classNumberPrefix.html#a3">NumberPrefix</a>. </td>
</tr>
</table>
<hr>The documentation for this class was generated from the following file:<ul>
<li>libqalculate/<a class="el" href="Prefix_8h.html">Prefix.h</a></ul>
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