mirror of
https://github.com/fofolee/uTools-Manuals.git
synced 2025-06-08 15:04:05 +08:00
30 lines
746 B
HTML
30 lines
746 B
HTML
<h1>字符函数 - toupper</h1>
|
||
<p>原型：extern int toupper(int c);</p>
|
||
<p>用法：#include <ctype.h></p>
|
||
<p>功能：将字符c转换为大写英文字母</p>
|
||
<p>说明：如果c为小写英文字母，则返回对应的大写字母；否则返回原来的值。</p>
|
||
举例：
|
||
<pre><code class="language-c">
|
||
// toupper.c
|
||
|
||
#include <syslib.h>
|
||
#include <ctype.h>
|
||
|
||
main()
|
||
{
|
||
char *s="Hello, World!";
|
||
int i;
|
||
|
||
clrscr(); // clear screen
|
||
printf("%s\n",s);
|
||
for(i=0;i<strlen(s);i++)
|
||
{
|
||
putchar(toupper(s[i]));
|
||
}
|
||
|
||
getchar();
|
||
return 0;
|
||
}
|
||
</code></pre>
|
||
相关函数：<a href="tolower.html">tolower</a>
|