输入一行字符，分别统计数字，大写字母，小写字母和其他字符的个数用c语言写

#include <stdio.h>

int main() {
    char str[100];
    int digits = 0, uppercase_letters = 0, lowercase_letters = 0, others = 0;
    printf("请输入一行字符：");
    fgets(str, 100, stdin); // 从标准输入读取一行字符
    for (int i = 0; str[i] != '\0'; i++) {
        if (str[i] >= '0' && str[i] <= '9') {
            digits++;
        } else if (str[i] >= 'A' && str[i] <= 'Z') {
            uppercase_letters++;
        } else if (str[i] >= 'a' && str[i] <= 'z') {
            lowercase_letters++;
        } else {
            others++;
        }
    }
    printf("数字：%d\n", digits);
    printf("大写字母：%d\n", uppercase_letters);
    printf("小写字母：%d\n", lowercase_letters);
    printf("其他字符：%d\n", others);
    return 0;
}