?? isalpha.html
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<title>字符函數 - isalpha</title>
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請選定要查看的函數
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<ul>
<li><a href="isalnum.html">isalnum</a></li>
<font color=red>
<li><a href="isalpha.html">isalpha</a></li>
</font>
<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>
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<td>目前共有15個函數</td>
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<tr><td height=62 valign=bottom><b><font size=5>isalpha</font></b></td></tr>
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<pre>
原型：extern int isalpha(int c);
用法：#include <ctype.h>
功能：判斷字符c是否為英文字母
說明：當c為英文字母a-z或A-Z時，返回非零值，否則返回零。
舉例：
// isalpha.c
#include <syslib.h>
#include <ctype.h>
#include <stdio.h>
main()
{
int c;
clrscr(); // clear screen
printf("Press a key");
for(;;)
{
c=getchar();
clrscr();
printf("%c: %s letter",c,isalpha(c)?"is":"not");
}
return 0; // just to avoid warnings by compiler
}
相關函數：<a href="isalnum.html">isalnum</a>,<a href="isdigit.html">isdigit</a>,<a href="isxdigit.html">isxdigit</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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