📄 atof.html

📁 unix 下的C开发手册,还用详细的例程。
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>atof</title></head><body bgcolor=white><center><font size=2>The Single UNIX &reg; Specification, Version 2<br>Copyright &copy; 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_001_242">&nbsp;</a>NAME</h4><blockquote>atof - convert a string to double-precision number</blockquote><h4><a name = "tag_000_001_243">&nbsp;</a>SYNOPSIS</h4><blockquote><pre><code>#include &lt;<a href="stdlib.h.html">stdlib.h</a>&gt;double atof(const char *<i>str</i>);</code></pre></blockquote><h4><a name = "tag_000_001_244">&nbsp;</a>DESCRIPTION</h4><blockquote>The call<i>atof</i>(<i>str</i>)is equivalent to:<pre><code>strtod(<i>str</i>,(char **)NULL),</code></pre>except that the handling of errors may differ.If the value cannot be represented, the behaviour is undefined.</blockquote><h4><a name = "tag_000_001_245">&nbsp;</a>RETURN VALUE</h4><blockquote>The<i>atof()</i>function returns the converted value if the value can berepresented.</blockquote><h4><a name = "tag_000_001_246">&nbsp;</a>ERRORS</h4><blockquote>No errors are defined.</blockquote><h4><a name = "tag_000_001_247">&nbsp;</a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_001_248">&nbsp;</a>APPLICATION USAGE</h4><blockquote>The<i>atof()</i>function is subsumed by<i><a href="strtod.html">strtod()</a></i>but is retained because it is used extensively in existing code. If the numberis not known to be in range,<i><a href="strtod.html">strtod()</a></i>should be used because<i>atof()</i>is not required to perform any error checking.</blockquote><h4><a name = "tag_000_001_249">&nbsp;</a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_001_250">&nbsp;</a>SEE ALSO</h4><blockquote><i><a href="strtod.html">strtod()</a></i>,<i><a href="stdlib.h.html">&lt;stdlib.h&gt;</a></i>.</blockquote><h4>DERIVATION</h4><blockquote>Derived from Issue 1 of the SVID.</blockquote><hr size=2 noshade><center><font size=2>UNIX &reg; is a registered Trademark of The Open Group.<br>Copyright &copy; 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>
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