name="google_ads_frame" marginwidth="0" marginheight="0" src="http://pagead2.googlesyndication.com/pagead/ads?client=ca-pub-5572165936844014&dt=1194442938015&lmt=1194190197&format=336x280_as&output=html&correlator=1194442937843&url=file%3A%2F%2F%2FC%3A%2FDocuments%2520and%2520Settings%2Flhh1%2F%E6%A1%8C%E9%9D%A2%2FCLanguage.htm&color_bg=FFFFFF&color_text=000000&color_link=000000&color_url=FFFFFF&color_border=FFFFFF&ad_type=text&ga_vid=583001034.1194442938&ga_sid=1194442938&ga_hid=1942779085&flash=9&u_h=768&u_w=1024&u_ah=740&u_aw=1024&u_cd=32&u_tz=480&u_java=true" frameborder="0" width="336" scrolling="no" height="280" allowtransparency="allowtransparency"> #include <stdio.h>
#include <ctype.h> // Contains the tolower prototype
void main(void)
{
int letter;
for (letter = getchar(); ! feof(stdin); letter = getchar())
putchar(tolower(letter));
}
本文展示了一个简单的C语言程序,该程序通过使用标准库函数`tolower`将输入的所有字符转换为小写形式。程序首先包含了必要的头文件`stdio.h`和`ctype.h`,然后在`main`函数中通过`getchar`读取字符并利用`tolower`函数进行大小写转换,最后通过`putchar`输出转换后的字符。
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