判断密码是否合法的C语言程序

#include <stdio.h>
#include <string.h>
#include <ctype.h>

int checkPassword(char *password) {
    int length = strlen(password);
    int hasUpper = 0;
    int hasLower = 0;
    int hasDigit = 0;
    int i;

    // 检查密码长度
    if (length < 8 || length > 16) {
        return 0;
    }

    // 检查密码字符组成
    for (i = 0; i < length; i++) {
        if (isupper(password[i])) {
            hasUpper = 1;
        } else if (islower(password[i])) {
            hasLower = 1;
        } else if (isdigit(password[i])) {
            hasDigit = 1;
        } else if (!(password[i] == '!' || password[i] == '@' || password[i] == '#' ||
                     password[i] == '$' || password[i] == '%' || password[i] == '^' ||
                     password[i] == '&' || password[i] == '*')) {
            return 0;
        }
    }

    // 检查是否包含所需字符
    if (!(hasUpper && hasLower && hasDigit)) {
        return 0;
    }

    return 1;
}

int main() {
    char password[20];

    printf("请输入密码：");
    scanf("%s", password);

    if (checkPassword(password)) {
        printf("密码合法！\n");
    } else {
        printf("密码不合法！\n");
    }

    return 0;
}

请输入密码：Abc123@
密码合法！