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C ctype isxdigit() 函数

❮ C ctype 库


示例

检查字符是否为十六进制数字

char c = 'A';
if (isxdigit(c)) {
  printf("%c is a hexadecimal digit", c);
} else {
  printf("%c is not a hexadecimal digit", c);
}
自己尝试 »

定义和用法

如果字符是“十六进制数字”,则 isxdigit() 函数返回一个非零值(相当于布尔值 true)。十六进制数字是字符 0 到 9 以及字母 A 到 F(大小写均可)。

isxdigit() 函数在 <ctype.h> 头文件中定义。


语法

int isxdigit(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,如果字符是十六进制数字,则为非零值(相当于布尔值 true)。

否则返回 0(相当于布尔值 false)。

❮ C ctype 库

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