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C ctype tolower() 函数

❮ C ctype 库


示例

将字符转换为小写

char u = 'A';
char l = tolower(u);
printf("%c in lowercase is %c", u, l);
自己尝试 »

定义和用法

tolower() 函数返回字符的小写版本的 ASCII 值。如果字符不是大写字符,则返回其值而不进行更改。

tolower() 函数在 <ctype.h> 头文件中定义。


语法

int tolower(int c);

参数值

参数 描述
c 必需。字符的 ASCII 值或实际字符

技术细节

返回值 一个 int 值,表示字符的小写版本的 ASCII 值。

❮ C ctype 库

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