如何计算星座

    //判定星座

    string constell_names[12][2]={
        {"山羊座","水瓶座"},
        {"水瓶座","双鱼座"},
        {"双鱼座","白羊座"},
        {"白羊座","金牛座"},
        {"金牛座","双子座"},
        {"双子座","巨蟹座"},
        {"巨蟹座","狮子座"},
        {"狮子座","处女座"},
        {"处女座","天枰座"},
        {"天枰座","天蝎座"},
        {"天蝎座","射手座"},
        {"射手座","山羊座"}
    };

    // 各月份跨星座的日期
    int constell_data[] = {20,19,21,20,21,22,23,23,23,24,23,22};

    //计算星座
     value_daughter_constell = constell_names[value_birth_month-1][value_birth_day/constell_data[value_birth_month-1]];