📄 getc.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>getc</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_005_443">&nbsp;</a>NAME</h4><blockquote>getc - get a byte from a stream</blockquote><h4><a name = "tag_000_005_444">&nbsp;</a>SYNOPSIS</h4><blockquote><pre><code>#include &lt;<a href="stdio.h.html">stdio.h</a>&gt;int getc(FILE *<i>stream</i>);</code></pre></blockquote><h4><a name = "tag_000_005_445">&nbsp;</a>DESCRIPTION</h4><blockquote>The<i>getc()</i>function is equivalent to<i><a href="fgetc.html">fgetc()</a></i>,except that if it is implemented as a macro it may evaluate<i>stream</i>more than once, so the argument should never be an expressionwith side effects.</blockquote><h4><a name = "tag_000_005_446">&nbsp;</a>RETURN VALUE</h4><blockquote>Refer to<i><a href="fgetc.html">fgetc()</a></i>.</blockquote><h4><a name = "tag_000_005_447">&nbsp;</a>ERRORS</h4><blockquote>Refer to<i><a href="fgetc.html">fgetc()</a></i>.</blockquote><h4><a name = "tag_000_005_448">&nbsp;</a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_005_449">&nbsp;</a>APPLICATION USAGE</h4><blockquote>If the integer value returned by<i>getc()</i>is stored into a variable of type<b>char</b>and then compared againstthe integer constant EOF,the comparison may never succeed,because sign-extension of a variable of type<b>char</b>on widening to integer is implementation-dependent.<p>Because it may be implemented as a macro,<i>getc()</i>may treat incorrectly a<i>stream</i>argument with side effects.  In particular,<i>getc</i>(*<i>f</i>++)will not necessarily work as expected.Therefore, use of this function should be preceded by &quot;#undef getc&quot; in such situations; <i><a href="fgetc.html">fgetc()</a></i>could also be used.</blockquote><h4><a name = "tag_000_005_450">&nbsp;</a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_005_451">&nbsp;</a>SEE ALSO</h4><blockquote><i><a href="fgetc.html">fgetc()</a></i>,<i><a href="stdio.h.html">&lt;stdio.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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