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<a name="Comparisons"></a>
<div class="header">
<p>
Next: <a href="Bit-manipulations.html#Bit-manipulations" accesskey="n" rel="next">Bit manipulations</a>, Previous: <a href="Calculations.html#Calculations" accesskey="p" rel="prev">Calculations</a>, Up: <a href="MPI-library.html#MPI-library" accesskey="u" rel="up">MPI library</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
<a name="Comparisons-1"></a>
<h3 class="section">12.5 Comparisons</h3>

<p>The next 2 functions are used to compare MPIs:
</p>

<dl>
<dt><a name="index-gcry_005fmpi_005fcmp"></a>Function: <em>int</em> <strong>gcry_mpi_cmp</strong> <em>(const&nbsp;<span class="nolinebreak">gcry_mpi_t</span>&nbsp;<var>u</var><!-- /@w -->, const&nbsp;<span class="nolinebreak">gcry_mpi_t</span>&nbsp;<var>v</var><!-- /@w -->)</em></dt>
<dd>
<p>Compare the multi-precision-integers number <var>u</var> and <var>v</var>
returning 0 for equality, a positive value for <var>u</var> &gt; <var>v</var> and a
negative for <var>u</var> &lt; <var>v</var>.  If both numbers are opaque values
(cf, gcry_mpi_set_opaque) the comparison is done by checking the bit
sizes using memcmp.  If only one number is an opaque value, the opaque
value is less than the other number.
</p></dd></dl>

<dl>
<dt><a name="index-gcry_005fmpi_005fcmp_005fui"></a>Function: <em>int</em> <strong>gcry_mpi_cmp_ui</strong> <em>(const&nbsp;<span class="nolinebreak">gcry_mpi_t</span>&nbsp;<var>u</var><!-- /@w -->, unsigned&nbsp;long&nbsp;<var>v</var><!-- /@w -->)</em></dt>
<dd>
<p>Compare the multi-precision-integers number <var>u</var> with the unsigned
integer <var>v</var> returning 0 for equality, a positive value for <var>u</var> &gt;
<var>v</var> and a negative for <var>u</var> &lt; <var>v</var>.
</p></dd></dl>

<dl>
<dt><a name="index-gcry_005fmpi_005fis_005fneg"></a>Function: <em>int</em> <strong>gcry_mpi_is_neg</strong> <em>(const&nbsp;<span class="nolinebreak">gcry_mpi_t</span>&nbsp;<var>a</var><!-- /@w -->)</em></dt>
<dd>
<p>Return 1 if <var>a</var> is less than zero; return 0 if zero or positive.
</p></dd></dl>





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