1 <?xml version="1.0" encoding="UTF-8" standalone="no"?> 2 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>Chapter12. Numerics</title><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><meta name="keywords" content="ISO C++, library" /><meta name="keywords" content="ISO C++, runtime, library" /><link rel="home" href="../index.html" title="The GNU C++ Library" /><link rel="up" href="std_contents.html" title="PartII. Standard Contents" /><link rel="prev" href="algorithms.html" title="Chapter11. Algorithms" /><link rel="next" href="generalized_numeric_operations.html" title="Generalized Operations" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter12. 3 Numerics 4 5 </th></tr><tr><td width="20%" align="left"><a accesskey="p" href="algorithms.html">Prev</a></td><th width="60%" align="center">PartII. 6 Standard Contents 7 </th><td width="20%" align="right"><a accesskey="n" href="generalized_numeric_operations.html">Next</a></td></tr></table><hr /></div><div class="chapter"><div class="titlepage"><div><div><h2 class="title"><a id="std.numerics"></a>Chapter12. 8 Numerics 9 <a id="id-1.3.4.10.1.1.1" class="indexterm"></a> 10 </h2></div></div></div><div class="toc"><p><strong>Table of Contents</strong></p><dl class="toc"><dt><span class="section"><a href="numerics.html#std.numerics.complex">Complex</a></span></dt><dd><dl><dt><span class="section"><a href="numerics.html#numerics.complex.processing">complex Processing</a></span></dt></dl></dd><dt><span class="section"><a href="generalized_numeric_operations.html">Generalized Operations</a></span></dt><dt><span class="section"><a href="numerics_and_c.html">Interacting with C</a></span></dt><dd><dl><dt><span class="section"><a href="numerics_and_c.html#numerics.c.array">Numerics vs. Arrays</a></span></dt><dt><span class="section"><a href="numerics_and_c.html#numerics.c.c99">C99</a></span></dt></dl></dd></dl></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="std.numerics.complex"></a>Complex</h2></div></div></div><p> 11 </p><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="numerics.complex.processing"></a>complex Processing</h3></div></div></div><p> 12 </p><p>Using <code class="code">complex<></code> becomes even more comple- er, sorry, 13 <span class="emphasis"><em>complicated</em></span>, with the not-quite-gratuitously-incompatible 14 addition of complex types to the C language. David Tribble has 15 compiled a list of C++98 and C99 conflict points; his description of 16 C's new type versus those of C++ and how to get them playing together 17 nicely is 18 <a class="link" href="http://david.tribble.com/text/cdiffs.htm#C99-complex" target="_top">here</a>. 19 </p><p><code class="code">complex<></code> is intended to be instantiated with a 20 floating-point type. As long as you meet that and some other basic 21 requirements, then the resulting instantiation has all of the usual 22 math operators defined, as well as definitions of <code class="code">op<<</code> 23 and <code class="code">op>></code> that work with iostreams: <code class="code">op<<</code> 24 prints <code class="code">(u,v)</code> and <code class="code">op>></code> can read <code class="code">u</code>, 25 <code class="code">(u)</code>, and <code class="code">(u,v)</code>. 26 </p><p>As an extension to C++11 and for increased compatibility with C, 27 <code class="code"><complex.h></code> includes both <code class="code"><complex></code> 28 and the C99 <code class="code"><complex.h></code> (if the C library provides 29 it). 30 </p></div></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="algorithms.html">Prev</a></td><td width="20%" align="center"><a accesskey="u" href="std_contents.html">Up</a></td><td width="40%" align="right"><a accesskey="n" href="generalized_numeric_operations.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter11. 31 Algorithms 32 33 </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top">Generalized Operations</td></tr></table></div></body></html>
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