在Java中2.定义接口Grader 常量:成绩等级(枚举) 抽象方法: score2Grade()方法: 根据成绩划分等级

接口Grader中可以这样定义常量和抽象方法：

public interface Grader {
    // 定义成绩等级的枚举
    enum Grade {
        A, B, C, D, E, F
    }

    // 抽象的成绩转等级方法
    Grade score2Grade(int score);
}

其中，Grade枚举类型定义了六个成绩等级，而score2Grade方法是通过传入成绩来计算对应的等级，但具体的实现需要在后面的类中定义。

相关问题

class Question: def __init__(self, stem, options, answer): self.stem = stem self.options = options self.answer = answerclass QuestionBank: def __init__(self): self.questions = [] def add_question(self, question): self.questions.append(question) def remove_question(self, question): self.questions.remove(question) def get_random_questions(self, num): return random.sample(self.questions, num)class Paper: def __init__(self, questions): self.questions = questions self.answers = {} def answer_question(self, question, answer): self.answers[question] = answer def get_score(self): score = 0 for question, answer in self.answers.items(): if answer == question.answer: score += 1 return scoreclass Grader: def __init__(self, paper): self.paper = paper def grade(self): return self.paper.get_score()# Example usagequestion1 = Question("What is the capital of France?", ["Paris", "London", "Berlin", "Madrid"], "Paris")question2 = Question("What is the largest planet in the solar system?", ["Mercury", "Venus", "Earth", "Jupiter"], "Jupiter")question3 = Question("What is the highest mountain in the world?", ["K2", "Mount Everest", "Makalu", "Cho Oyu"], "Mount Everest")question_bank = QuestionBank()question_bank.add_question(question1)question_bank.add_question(question2)question_bank.add_question(question3)paper = Paper(question_bank.get_random_questions(2))paper.answer_question(question1, "Paris")paper.answer_question(question2, "Jupiter")grader = Grader(paper)score = grader.grade()print("Your score is:", score)将这个代码转为C++的

好的，以下是将 Python 代码转换为 C++ 代码的示例：

#include <iostream>
#include <vector>
#include <map>
#include <string>
#include <algorithm>
#include <random>

using namespace std;

class Question {
public:
    string stem;
    vector<string> options;
    string answer;
    Question(string s, vector<string> o, string a) {
        stem = s;
        options = o;
        answer = a;
    }
};

class QuestionBank {
public:
    vector<Question> questions;
    void add_question(Question q) {
        questions.push_back(q);
    }
    void remove_question(Question q) {
        questions.erase(remove(questions.begin(), questions.end(), q), questions.end());
    }
    vector<Question> get_random_questions(int num) {
        vector<Question> res;
        random_device rd;
        mt19937 gen(rd());
        shuffle(questions.begin(), questions.end(), gen);
        for (int i = 0; i < num; ++i) {
            res.push_back(questions[i]);
        }
        return res;
    }
};

class Paper {
public:
    vector<Question> questions;
    map<Question, string> answers;
    Paper(vector<Question> q) {
        questions = q;
    }
    void answer_question(Question q, string a) {
        answers[q] = a;
    }
    int get_score() {
        int score = 0;
        for (auto const& x : answers) {
            if (x.second == x.first.answer) {
                score++;
            }
        }
        return score;
    }
};

class Grader {
public:
    Paper paper;
    Grader(Paper p) {
        paper = p;
    }
    int grade() {
        return paper.get_score();
    }
};

int main() {
    Question question1("What is the capital of France?", {"Paris", "London", "Berlin", "Madrid"}, "Paris");
    Question question2("What is the largest planet in the solar system?", {"Mercury", "Venus", "Earth", "Jupiter"}, "Jupiter");
    Question question3("What is the highest mountain in the world?", {"K2", "Mount Everest", "Makalu", "Cho Oyu"}, "Mount Everest");
    QuestionBank question_bank;
    question_bank.add_question(question1);
    question_bank.add_question(question2);
    question_bank.add_question(question3);
    vector<Question> random_questions = question_bank.get_random_questions(2);
    Paper paper(random_questions);
    paper.answer_question(question1, "Paris");
    paper.answer_question(question2, "Jupiter");
    Grader grader(paper);
    int score = grader.grade();
    cout << "Your score is: " << score << endl;
    return 0;
}

注意，这只是一个简单的示例，实际情况下可能需要更多的代码来处理错误处理、用户输入等问题。

CREATE VIEW EXAM_V_GRADER AS SELECT A.CHEJIAN CHEJIAN, A.BANZU BANZU, A.USER001 USER001, A.USER002 USER002, A.USER097 USER097, A.DELFLAG DELFLAG, A.USER004 USER004, A.USER005 USER005, A.USER007 USER007, A.USER032 USER032, A.USER043 USER043, B.ORGA014 ORGA014, B.ISDEL ISDEL, B.ORGA002 ORGA002, B.ORGA008 ORGA008, B.ORGA012 ORGA012, IFNULL ( C.CATA002, '--' ) CATA002 FROM ( ( ( ( SELECT U.BIRTHDATE USER007, U.CHEJIAN CHEJIAN, U.BANZU BANZU, U.ID USER001, U.ORG_ID USER002, U.STATUS USER017, U.WORKERS_TYPE USER032, U.POLITICAL_STATUS USER043, U.ID_STATISTICS USER097, U.DEL_FLAG DELFLAG, U.ACCOUNT USER004, U.NAME USER005 FROM ( HRSW_T_USER_WHJ U LEFT JOIN HRSW_T_USEREXT_WHJ EXT ON ( ( U.ID = EXT.ID ) ) ) ) ) A JOIN HRSW_T_ORGAN B ON ( ( A.USER002 = B.ORGA001 ) ) ) LEFT JOIN ( SELECT N.CDOM006 CDOM006, GROUP_CONCAT ( M.CATA002 ORDER BY M.CATA006 C SEPARATOR ',' ) CATA002 FROM ( HRSW_T_CATALOG M JOIN HRSW_T_CATALOGDOMAIN N ON ( ( ( M.CATA001 = N.CDOM005 ) AND ( M.CATA008 = 2 ) ) ) ) GROUP BY N.CDOM006 ) C ON ( ( A.USER001 = C.CDOM006 ) ) ) WHERE ( ( A.USER017 IN ( 1, 2 ) ) AND ( B.ORGA013 = 1 ) );

这是一个创建视图的 SQL 语句，它的作用是将多个表中的数据组合起来，形成一个虚拟的表格。

该视图名为 `EXAM_V_GRADER`，它包含了以下列：

- `CHEJIAN`：车间
- `BANZU`：班组
- `USER001`：用户 ID
- `USER002`：用户所属组织机构 ID
- `USER097`：用户身份证号码
- `DELFLAG`：删除标志
- `USER004`：用户账号
- `USER005`：用户姓名
- `USER007`：用户生日
- `USER032`：用户工种
- `USER043`：用户政治面貌
- `ORGA014`：组织机构名称
- `ISDEL`：是否删除
- `ORGA002`：组织机构编码
- `ORGA008`：组织机构级别
- `ORGA012`：组织机构类型
- `CATA002`：用户所拥有的技能

该视图的数据来源是多个表的组合查询，包括：

- `HRSW_T_USER_WHJ`：用户信息表
- `HRSW_T_USEREXT_WHJ`：用户扩展信息表
- `HRSW_T_ORGAN`：组织机构信息表
- `HRSW_T_CATALOG`：技能信息表
- `HRSW_T_CATALOGDOMAIN`：技能分类信息表

该视图的查询条件是 `USER017` 字段的值为 1 或 2，且 `ORGA013` 字段的值为 1。