程序代码：

// 星座计算函数
std::string GetZodiacSign(int month, int day) {

    struct ZodiacSign {
        std::string name;
        int startMonth;
        int startDay;
        int endMonth;
        int endDay;
    };

    // 定义星座数组
    const std::array<ZodiacSign, 12> zodiacSigns = { {
        {"水瓶座",  1, 20,  2, 18},
        {"双鱼座",  2, 19,  3, 20},
        {"白羊座",  3, 21,  4, 19},
        {"金牛座",  4, 20,  5, 20},
        {"双子座",  5, 21,  6, 20},
        {"巨蟹座",  6, 21,  7, 22},
        {"狮子座",  7, 23,  8, 22},
        {"处女座",  8, 23,  9, 22},
        {"天秤座",  9, 23, 10, 22},
        {"天蝎座", 10, 23, 11, 21},
        {"射手座", 11, 22, 12, 21},
        {"摩羯座", 12, 22,  1, 19}
    } };

    for (const auto& sign : zodiacSigns) {
        if ((month == sign.startMonth && day >= sign.startDay) ||
            (month == sign.endMonth && day <= sign.endDay)) {
            return sign.name;
        }
    }
    return "未知"; // 如果没有匹配的星座
}