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<title>Decimals &#8212; mpdecimal 2.5.1 documentation</title>
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<li><a class="reference internal" href="#">Decimals</a><ul>
<li><a class="reference internal" href="#data-type">Data Type</a></li>
<li><a class="reference internal" href="#allocation-functions">Allocation Functions</a></li>
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  <div class="section" id="decimals">
<h1>Decimals</h1>
<div class="section" id="data-type">
<h2>Data Type</h2>
<p>The decimal data type is called <code class="xref c c-macro docutils literal notranslate"><span class="pre">mpd_t</span></code>, which is short for
<em>multi precision decimal</em>.</p>
<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="cp">#include</span> <span class="cpf">&lt;mpdecimal.h&gt;</span><span class="cp"></span>

<span class="k">typedef</span> <span class="k">struct</span> <span class="nc">mpd_t</span> <span class="p">{</span>
       <span class="kt">uint8_t</span> <span class="n">flags</span><span class="p">;</span>       <span class="c1">// [memory flags] | [specials] | sign</span>
       <span class="n">mpd_ssize_t</span> <span class="n">exp</span><span class="p">;</span>     <span class="c1">// exponent</span>
       <span class="n">mpd_ssize_t</span> <span class="n">digits</span><span class="p">;</span>  <span class="c1">// number of decimal digits</span>
       <span class="n">mpd_ssize_t</span> <span class="n">len</span><span class="p">;</span>     <span class="c1">// number of words in use</span>
       <span class="n">mpd_ssize_t</span> <span class="n">alloc</span><span class="p">;</span>   <span class="c1">// number of allocated words</span>
       <span class="n">mpd_uint_t</span> <span class="o">*</span><span class="n">data</span><span class="p">;</span>    <span class="c1">// words</span>
<span class="p">}</span> <span class="n">mpd_t</span><span class="p">;</span>
</pre></div>
</div>
<p>The flags contain two types of information: The lowest bit is the sign of the
decimal. The following three bits determine whether the decimal is Infinity,
NaN or sNaN. The upper four bits carry the information how the storage was
allocated. The normal case is that both the struct and the data have been
dynamically allocated by <code class="xref c c-func docutils literal notranslate"><span class="pre">mpd_new</span></code>. More on this in the section
<a class="reference internal" href="memory.html#advanced-memory-handling"><span class="std std-ref">Advanced Memory Handling</span></a>.</p>
</div>
<div class="section" id="allocation-functions">
<h2>Allocation Functions</h2>
<span class="target" id="std:topic-mpd_qnew"></span><div class="highlight-c notranslate" id="std:topic-mpd_new"><div class="highlight"><pre><span></span><span class="n">mpd_t</span> <span class="o">*</span><span class="nf">mpd_qnew</span><span class="p">(</span><span class="kt">void</span><span class="p">);</span>
<span class="n">mpd_t</span> <span class="o">*</span><span class="nf">mpd_new</span><span class="p">(</span><span class="n">mpd_context_t</span> <span class="o">*</span><span class="n">ctx</span><span class="p">);</span>
</pre></div>
</div>
<p><code class="xref c c-func docutils literal notranslate"><span class="pre">mpd_qnew</span></code> attempts to allocate a dynamic decimal with <code class="xref c c-macro docutils literal notranslate"><span class="pre">MPD_MINALLOC</span></code>
words reserved for the coefficient. If successful, the return value is the new
pointer, <code class="xref c c-macro docutils literal notranslate"><span class="pre">NULL</span></code> otherwise. <code class="xref c c-func docutils literal notranslate"><span class="pre">mpd_new</span></code> is the same, but raises the
<code class="xref c c-macro docutils literal notranslate"><span class="pre">MPD_Malloc_error</span></code> exception on failure.</p>
<div class="highlight-c notranslate" id="std:topic-mpd_qnew_size"><div class="highlight"><pre><span></span><span class="n">mpd_t</span> <span class="o">*</span><span class="nf">mpd_qnew_size</span><span class="p">(</span><span class="n">mpd_ssize_t</span> <span class="n">size</span><span class="p">);</span>
</pre></div>
</div>
<p>Same as <code class="xref c c-func docutils literal notranslate"><span class="pre">mpd_qnew</span></code>, but the <em>size</em> argument indicates that <em>size</em> words
should be allocated for the coefficient rather than <code class="xref c c-macro docutils literal notranslate"><span class="pre">MPD_MINALLOC</span></code> words.</p>
<div class="highlight-c notranslate" id="std:topic-mpd_del"><div class="highlight"><pre><span></span><span class="kt">void</span> <span class="nf">mpd_del</span><span class="p">(</span><span class="n">mpd_t</span> <span class="o">*</span><span class="n">dec</span><span class="p">);</span>
</pre></div>
</div>
<p><code class="xref c c-func docutils literal notranslate"><span class="pre">mpd_del</span></code> frees all storage allocated for a decimal. The function may
also be called with a completely or partly static decimal as an argument, see
<a class="reference internal" href="memory.html#advanced-memory-handling"><span class="std std-ref">Advanced Memory Handling</span></a>.</p>
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