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<a name="Comparing-Rationals"></a>
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<p>
Next: <a href="Applying-Integer-Functions.html#Applying-Integer-Functions" accesskey="n" rel="next">Applying Integer Functions</a>, Previous: <a href="Rational-Arithmetic.html#Rational-Arithmetic" accesskey="p" rel="prev">Rational Arithmetic</a>, Up: <a href="Rational-Number-Functions.html#Rational-Number-Functions" accesskey="u" rel="up">Rational Number Functions</a> &nbsp; [<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Comparison-Functions-1"></a>
<h3 class="section">6.4 Comparison Functions</h3>
<a name="index-Rational-comparison-functions"></a>
<a name="index-Comparison-functions-1"></a>
<dl>
<dt><a name="index-mpq_005fcmp"></a>Function: <em>int</em> <strong>mpq_cmp</strong> <em>(const mpq_t <var>op1</var>, const mpq_t <var>op2</var>)</em></dt>
<dt><a name="index-mpq_005fcmp_005fz"></a>Function: <em>int</em> <strong>mpq_cmp_z</strong> <em>(const mpq_t <var>op1</var>, const mpz_t <var>op2</var>)</em></dt>
<dd><p>Compare <var>op1</var> and <var>op2</var>. Return a positive value if <em><var>op1</var> &gt;
<var>op2</var></em>, zero if <em><var>op1</var> = <var>op2</var></em>, and a negative value if
<em><var>op1</var> &lt; <var>op2</var></em>.
</p>
<p>To determine if two rationals are equal, <code>mpq_equal</code> is faster than
<code>mpq_cmp</code>.
</p></dd></dl>
<dl>
<dt><a name="index-mpq_005fcmp_005fui"></a>Macro: <em>int</em> <strong>mpq_cmp_ui</strong> <em>(const mpq_t <var>op1</var>, unsigned long int <var>num2</var>, unsigned long int <var>den2</var>)</em></dt>
<dt><a name="index-mpq_005fcmp_005fsi"></a>Macro: <em>int</em> <strong>mpq_cmp_si</strong> <em>(const mpq_t <var>op1</var>, long int <var>num2</var>, unsigned long int <var>den2</var>)</em></dt>
<dd><p>Compare <var>op1</var> and <var>num2</var>/<var>den2</var>. Return a positive value if
<em><var>op1</var> &gt; <var>num2</var>/<var>den2</var></em>, zero if <em><var>op1</var> =
<var>num2</var>/<var>den2</var></em>, and a negative value if <em><var>op1</var> &lt;
<var>num2</var>/<var>den2</var></em>.
</p>
<p><var>num2</var> and <var>den2</var> are allowed to have common factors.
</p>
<p>These functions are implemented as a macros and evaluate their arguments
multiple times.
</p></dd></dl>
<dl>
<dt><a name="index-mpq_005fsgn"></a>Macro: <em>int</em> <strong>mpq_sgn</strong> <em>(const mpq_t <var>op</var>)</em></dt>
<dd><a name="index-Sign-tests-1"></a>
<a name="index-Rational-sign-tests"></a>
<p>Return <em>+1</em> if <em><var>op</var> &gt; 0</em>, 0 if <em><var>op</var> = 0</em>, and
<em>-1</em> if <em><var>op</var> &lt; 0</em>.
</p>
<p>This function is actually implemented as a macro. It evaluates its
argument multiple times.
</p></dd></dl>
<dl>
<dt><a name="index-mpq_005fequal"></a>Function: <em>int</em> <strong>mpq_equal</strong> <em>(const mpq_t <var>op1</var>, const mpq_t <var>op2</var>)</em></dt>
<dd><p>Return non-zero if <var>op1</var> and <var>op2</var> are equal, zero if they are
non-equal. Although <code>mpq_cmp</code> can be used for the same purpose, this
function is much faster.
</p></dd></dl>
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