C++ 实现学生成绩管理系统

思路:

  1. 定义 Student 类,包含学生的基本信息和成绩。
  2. 实现添加学生、删除学生、修改成绩、显示所有学生成绩和查找学生的功能。
  3. 使用向量(vector)存储学生信息。
#include <iostream>
#include <vector>
#include <string>

using namespace std;

// Student 类定义
class Student {
public:
    string name;
    int id;
    vector<int> scores;

    Student(string n, int i) : name(n), id(i) {}

    // 计算平均成绩
    float getAverageScore() {
        int total = 0;
        for (int score : scores) {
            total += score;
        }
        return scores.empty() ? 0 : (float)total / scores.size();
    }

    // 显示学生信息
    void display() {
        cout << "ID: " << id << ", Name: " << name << ", Average Score: " << getAverageScore() << endl;
    }
};

// 成绩管理系统类定义
class GradeManagementSystem {
private:
    vector<Student> students;

public:
    // 添加学生
    void addStudent(string name, int id) {
        students.push_back(Student(name, id));
    }

    // 删除学生
    void removeStudent(int id) {
        for (auto it = students.begin(); it != students.end(); ++it) {
            if (it->id == id) {
                students.erase(it);
                cout << "Student ID " << id << " removed." << endl;
                return;
            }
        }
        cout << "Student ID " << id << " not found." << endl;
    }

    // 添加成绩
    void addScore(int id, int score) {
        for (Student &student : students) {
            if (student.id == id) {
                student.scores.push_back(score);
                cout << "Score added to student ID " << id << "." << endl;
                return;
            }
        }
        cout << "Student ID " << id << " not found." << endl;
    }

    // 显示所有学生成绩
    void displayAllStudents() {
        for (Student &student : students) {
            student.display();
        }
    }

    // 查找学生
    void findStudent(int id) {
        for (Student &student : students) {
            if (student.id == id) {
                student.display();
                return;
            }
        }
        cout << "Student ID " << id << " not found." << endl;
    }
};

int main() {
    GradeManagementSystem gms;
    int choice, id, score;
    string name;

    while (true) {
        cout << "\nStudent Grade Management System\n";
        cout << "1. Add Student\n";
        cout << "2. Remove Student\n";
        cout << "3. Add Score\n";
        cout << "4. Display All Students\n";
        cout << "5. Find Student\n";
        cout << "6. Exit\n";
        cout << "Enter your choice: ";
        cin >> choice;

        switch (choice) {
            case 1:
                cout << "Enter student name: ";
                cin >> name;
                cout << "Enter student ID: ";
                cin >> id;
                gms.addStudent(name, id);
                break;
            case 2:
                cout << "Enter student ID to remove: ";
                cin >> id;
                gms.removeStudent(id);
                break;
            case 3:
                cout << "Enter student ID to add score: ";
                cin >> id;
                cout << "Enter score: ";
                cin >> score;
                gms.addScore(id, score);
                break;
            case 4:
                gms.displayAllStudents();
                break;
            case 5:
                cout << "Enter student ID to find: ";
                cin >> id;
                gms.findStudent(id);
                break;
            case 6:
                return 0;
            default:
                cout << "Invalid choice. Please try again.\n";
        }
    }
}

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