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請選定要查看的函數(shù)
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<ul>
<li><a href="isalnum.html">isalnum</a></li>
<li><a href="isalpha.html">isalpha</a></li>
<li><a href="iscntrl.html">iscntrl</a></li>
<li><a href="isdigit.html">isdigit</a></li>
<li><a href="islower.html">islower</a></li>
<li><a href="isascii.html">isascii</a></li>
<li><a href="isgraph.html">isgraph</a></li>
<li><a href="isprint.html">isprint</a></li>
<li><a href="ispunct.html">ispunct</a></li>
<li><a href="isspace.html">isspace</a></li>
<li><a href="isupper.html">isupper</a></li>
<li><a href="isxdigit.html">isxdigit</a></li>
<li><a href="toascii.html">toascii</a></li>
<li><a href="tolower.html">tolower</a></li>
<li><a href="toupper.html">toupper</a></li>
</ul>
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<td>目前共有15個(gè)函數(shù)</td>
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<tr><td height=1 width=1 bgcolor=#649ACC><img border=0 width=1 height=1 src="images/null.gif"></td></tr>
<tr><td height=62 valign=bottom><b><font size=5>isblank</font></b></td></tr>
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<td height=1 width=150 bgcolor=#649ACC><img border=0 width=1 height=1 src="images/null.gif"></td>
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<pre>
原型：extern int isblank(int c);
用法：#include <ctype.h>
功能：判斷字符c是否為TAB或空格
說明：當(dāng)c為TAB或空格時(shí)，返回非零值，否則返回零。
舉例：
// isalnum.c
#include <syslib.h>
#include <ctype.h>
main()
{
int c;
clrscr(); // clear screen
c='a';
printf("%c:%s\n",c,isalnum(c)?"yes":"no");
c='7';
printf("%c:%s\n",c,isalnum(c)?"yes":"no");
c='@';
printf("%c:%s\n",c,isalnum(c)?"yes":"no");
}
相關(guān)函數(shù)：<a href="isalpha.html">isalnum</a>,<a href="isalpha.html">isalpha</a>,<a href="iscntrl.html">iscntrl</a>,<a href="isgraph.html">isgraph</a>,<a href="isprint.html">isprint</a>,<a href="ispunct.html">ispunct</a>,<a href=isspace.html">isspace</a>
</pre>
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