How does the c language determine Chinese characters?

In C language, one can use Unicode encoding to determine if a character is a Chinese character. In Unicode encoding, the range for Chinese characters is 0x4E00 to 0x9FA5. The following code can be used to check if a character is a Chinese character:

#include <stdio.h>

int isChineseChar(char c) {
    unsigned int unicode = (unsigned int)c;
    if (unicode >= 0x4E00 && unicode <= 0x9FA5) {
        return 1;
    }
    return 0;
}

int main() {
    char c;
    printf("请输入一个字符：");
    scanf("%c", &c);
    if (isChineseChar(c)) {
        printf("这是一个中文字符。\n");
    } else {
        printf("这不是一个中文字符。\n");
    }
    return 0;
}

In the sample code above, the function isChineseChar is used to determine whether a character is a Chinese character. It first converts the character to the Unicode code in unsigned integer form, then checks if the Unicode code falls within the range of Chinese characters to determine if it is a Chinese character. In the main function, a character is first inputted, then the isChineseChar function is called to check if the inputted character is a Chinese character, and the corresponding result is outputted.