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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><HTML><HEAD> <META NAME="GENERATOR" CONTENT="LinuxDoc-Tools 0.9.20"> <TITLE>cc65 function reference: Alphabetical function reference: islower</TITLE> <LINK HREF="funcref-110.html" REL=next> <LINK HREF="funcref-108.html" REL=previous> <LINK HREF="funcref.html#toc3" REL=contents></HEAD><BODY><A HREF="funcref-110.html">Next</A><A HREF="funcref-108.html">Previous</A><A HREF="funcref.html#toc3">Contents</A><HR><H2><A NAME="islower"></A> 3.68 <A HREF="funcref.html#toc3.68">islower</A></H2><P><BLOCKQUOTE><DL><DT><B>Function</B><DD><P>Check if a given character is a lower case letter.</P><DT><B>Header</B><DD><P><CODE><A HREF="funcref-12.html#ctype.h">ctype.h</A></CODE></P><DT><B>Declaration</B><DD><P><CODE>int __fastcall__ islower (int c);</CODE></P><DT><B>Description</B><DD><P>The function returns a value of zero if the given argumentis a lower case letter. The return value is non zero if the character isanything else.</P><DT><B>Limits</B><DD><P><UL><LI>When compiling with <CODE>-Os</CODE> the function is actually a macro. Theinline sequence generated by the macro will not work correctly for valuesoutside the range 0..255. <B>Note:</B> The constant <CODE>EOF</CODE> is not part ofthis range. The non inline function may be accessed by <CODE>#undef</CODE>'ing themacro.</LI><LI>When compiling without <CODE>-Os</CODE>, the function is only available asfastcall function, so it may only be used in presence of a prototype.</LI></UL></P><DT><B>Availability</B><DD><P>ISO 9899</P><DT><B>See also</B><DD><P><A HREF="funcref-102.html#isalnum">isalnum</A>,<A HREF="funcref-103.html#isalpha">isalpha</A>,<A HREF="funcref-104.html#isascii">isascii</A>,<A HREF="funcref-105.html#isblank">isblank</A>,<A HREF="funcref-106.html#iscntrl">iscntrl</A>,<A HREF="funcref-107.html#isdigit">isdigit</A>,<A HREF="funcref-108.html#isgraph">isgraph</A>,<A HREF="funcref-110.html#isprint">isprint</A>,<A HREF="funcref-111.html#ispunct">ispunct</A>,<A HREF="funcref-112.html#isspace">isspace</A>,<A HREF="funcref-113.html#isupper">isupper</A>,<A HREF="funcref-114.html#isxdigit">isxdigit</A></P><DT><B>Example</B><DD><P>None.</P></DL></BLOCKQUOTE></P><HR><A HREF="funcref-110.html">Next</A><A HREF="funcref-108.html">Previous</A><A HREF="funcref.html#toc3">Contents</A></BODY></HTML>?? 快捷鍵說明
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