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StudentSystem.cpp

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+#include <iostream>
+#include <map>
+#include <fstream>
+#include <string>
+#include <unordered_map>
+
+// 基类 Student
+class Student {
+	protected:
+		std::string name;
+		std::string id;
+		float totalScore;
+
+	public:
+		Student(const std::string &name, const std::string &id) : name(name), id(id), totalScore(0.0f) {}
+		virtual ~Student() {}
+
+		virtual void calculateTotalScore() = 0;
+		virtual void display() const = 0;
+
+		const std::string &getName() const {
+			return name;
+		}
+		const std::string &getId() const {
+			return id;
+		}
+		float getTotalScore() const {
+			return totalScore;
+		}
+};
+
+// 本科生类 Undergraduate
+class Undergraduate : public Student {
+	private:
+		float usualScore;
+		float midtermScore;
+		float finalScore;
+
+	public:
+		Undergraduate(const std::string &name, const std::string &id, float usual, float midterm, float final)
+			: Student(name, id), usualScore(usual), midtermScore(midterm), finalScore(final) {}
+
+		void calculateTotalScore() override {
+			totalScore = usualScore * 0.3f + midtermScore * 0.3f + finalScore * 0.4f;
+		}
+
+		void display() const override {
+			std::cout << "姓名: " << name << ", ID: " << id
+			          << ", 平时成绩: " << usualScore
+			          << ", 期中成绩: " << midtermScore
+			          << ", 期末成绩: " << finalScore
+			          << ", 总分: " << totalScore << std::endl;
+		}
+};
+
+// 研究生类 Graduate
+class Graduate : public Student {
+	private:
+		float writtenScore;
+		float interviewScore;
+
+	public:
+		Graduate(const std::string &name, const std::string &id, float written, float interview)
+			: Student(name, id), writtenScore(written), interviewScore(interview) {}
+
+		void calculateTotalScore() override {
+			totalScore = writtenScore * 0.7f + interviewScore * 0.3f;
+		}
+
+		void display() const override {
+			std::cout << "姓名: " << name << ", ID: " << id
+			          << ", 笔试成绩: " << writtenScore
+			          << ", 面试成绩: " << interviewScore
+			          << ", 总分: " << totalScore << std::endl;
+		}
+};
+
+// 学生管理类 StudentManager
+class StudentManager {
+	private:
+		std::map<std::string, Student *> students;
+
+	public:
+		void addStudent(Student *student) {
+			students[student->getId()] = student;
+		}
+
+		void removeStudent(const std::string &id) {
+			if (students.find(id) != students.end()) {
+				delete students[id];
+				students.erase(id);
+				std::cout << "学生 " << id << " 成功删除." << std::endl;
+			} else {
+				std::cerr << "学生 " << id << " 不存在." << std::endl;
+			}
+		}
+
+		void queryStudent(const std::string &id) {
+			if (students.find(id) != students.end()) {
+				students[id]->display();
+			} else {
+				std::cerr << "学生 " << id << " 不存在." << std::endl;
+			}
+		}
+
+		void displayAllStudents() {
+			for (const auto &pair : students) {
+				pair.second->display();
+			}
+		}
+
+		void saveToFile(const StudentManager &manager, const std::string &filename) {
+			std::ofstream outfile(filename);
+			if (!outfile.is_open()) {
+				std::cerr << "文件不存在" << std::endl;
+				return;
+			}
+			for (const auto &pair : manager.students) {
+				pair.second->display();
+				outfile << pair.second->getName() << "," << pair.second->getId() << "," << pair.second->getTotalScore() << std::endl;
+			}
+			outfile.close();
+			std::cout << "数据成功录入." << std::endl;
+		}
+
+};
+
+int main() {
+	StudentManager manager;
+	bool running = true;
+	int choice;
+
+	while (running) {
+		std::cout << "学生成绩管理系统\n";
+		std::cout << "输入1以添加学生\n";
+		std::cout << "输入2以查询学生\n";
+		std::cout << "输入3以删除学生\n";
+		std::cout << "输入4以展示所有学生成绩\n";
+		std::cout << "输入5以保存数据\n";
+		std::cout << "输入6以退出\n";
+		std::cout << "请输入你的指令: \n";
+		std::cin >> choice;
+
+		switch (choice) {
+			case 1: {
+				std::string name, id, type;
+				float score1, score2, score3;
+				std::cout << "输入学生姓名: ";
+				std::cin >> name;
+				std::cout << "输入学生ID: ";
+				std::cin >> id;
+				std::cout << "如果是本科生请输入u，研究生则输入g :";
+				std::cin >> type;
+
+
+				if (type == "u" || type == "U") {
+					std::cout << "输入平时成绩: ";
+					std::cin >> score1;
+					std::cout << "输入期中成绩: ";
+					std::cin >> score2;
+					std::cout << "输入期末成绩: ";
+					std::cin >> score3;
+					std::cout << "添加成功\n"<<std::endl;
+					Undergraduate *undergraduate = new Undergraduate(name, id, score1, score2, score3);
+					undergraduate->calculateTotalScore();
+					manager.addStudent(undergraduate);
+				} else if (type == "g" || type == "G") {
+					std::cout << "输入笔试成绩: ";
+					std::cin >> score1;
+					std::cout << "输入面试成绩: ";
+					std::cin >> score2;
+					std::cout << "添加成功\n"<<std::endl;
+					Graduate *graduate = new Graduate(name, id, score1, score2);
+					graduate->calculateTotalScore();
+					manager.addStudent(graduate);
+				} else {
+					std::cerr << "不存在该类型. 请重试." << std::endl;
+				}
+				break;
+			}
+			case 2: {
+				std::string id;
+				std::cout << "输入需要查询的学生的ID: ";
+				std::cin >> id;
+				manager.queryStudent(id);
+				break;
+			}
+			case 3: {
+				std::string id;
+				std::cout << "输入需要删除的学生的ID: ";
+				std::cin >> id;
+				manager.removeStudent(id);
+				break;
+			}
+			case 4: {
+				manager.displayAllStudents();
+				break;
+			}
+			case 5: {
+				std::string filename;
+				std::cout << "输入文件名称: ";
+				std::cin >> filename;
+				manager.saveToFile(manager, filename);
+				break;
+			}
+			case 6: {
+				running = false;
+				std::cout << "正在退出" << std::endl;
+				break;
+			}
+			default: {
+				std::cout << "不存在该选项，请重试." << std::endl;
+			}
+		}
+	}
+	return 0;
+}
+