c++设计一个学生成绩管理系统，包含以下功能“1.添加学生成绩记录 2.显示学生成绩记录 3.查找学生成绩记录 4.删除学生成绩记录 5.保存学生成绩记录 6.导出学生成绩记录 0.退出学生成绩管理系统”源代码

好的，以下是一个简单的实现示例：

#include <iostream>
#include <string>
#include <vector>
#include <fstream>
#include <sstream>

using namespace std;

// 定义学生结构体
struct Student {
    string name;
    string id;
    float mathScore;
    float englishScore;
    float computerScore;
};

// 动态数组存储所有学生记录
vector<Student> studentList;

// 显示菜单
void showMenu() {
    cout << "**********学生成绩管理系统**********" << endl;
    cout << "1.添加学生成绩记录" << endl;
    cout << "2.显示学生成绩记录" << endl;
    cout << "3.查找学生成绩记录" << endl;
    cout << "4.删除学生成绩记录" << endl;
    cout << "5.保存学生成绩记录" << endl;
    cout << "6.导出学生成绩记录" << endl;
    cout << "0.退出学生成绩管理系统" << endl;
    cout << "************************************" << endl;
}

// 添加学生记录
void addStudent() {
    Student student;
    cout << "请输入学生姓名：";
    cin >> student.name;
    cout << "请输入学生学号：";
    cin >> student.id;
    cout << "请输入数学成绩：";
    cin >> student.mathScore;
    cout << "请输入英语成绩：";
    cin >> student.englishScore;
    cout << "请输入计算机成绩：";
    cin >> student.computerScore;
    studentList.push_back(student);
    cout << "添加成功！" << endl;
}

// 显示学生记录
void showStudent() {
    if (studentList.empty()) {
        cout << "暂无学生记录！" << endl;
        return;
    }
    for (int i = 0; i < studentList.size(); i++) {
        cout << "姓名：" << studentList[i].name << " 学号：" << studentList[i].id
             << " 数学成绩：" << studentList[i].mathScore << " 英语成绩："
             << studentList[i].englishScore << " 计算机成绩：" << studentList[i].computerScore << endl;
    }
}

// 查找学生记录
void searchStudent() {
    string keyword;
    cout << "请输入要查找的学生姓名或学号：";
    cin >> keyword;
    for (int i = 0; i < studentList.size(); i++) {
        if (studentList[i].name == keyword || studentList[i].id == keyword) {
            cout << "姓名：" << studentList[i].name << " 学号：" << studentList[i].id
                 << " 数学成绩：" << studentList[i].mathScore << " 英语成绩："
                 << studentList[i].englishScore << " 计算机成绩：" << studentList[i].computerScore << endl;
            return;
        }
    }
    cout << "未找到相关学生记录！" << endl;
}

// 删除学生记录
void deleteStudent() {
    string keyword;
    cout << "请输入要删除的学生姓名或学号：";
    cin >> keyword;
    for (int i = 0; i < studentList.size(); i++) {
        if (studentList[i].name == keyword || studentList[i].id == keyword) {
            studentList.erase(studentList.begin() + i);
            cout << "删除成功！" << endl;
            return;
        }
    }
    cout << "未找到相关学生记录！" << endl;
}

// 保存学生记录到文件
void saveToFile() {
    ofstream outFile("students.txt");
    if (outFile.fail()) {
        cout << "保存失败！" << endl;
        return;
    }
    for (int i = 0; i < studentList.size(); i++) {
        outFile << studentList[i].name << " " << studentList[i].id << " "
                << studentList[i].mathScore << " " << studentList[i].englishScore
                << " " << studentList[i].computerScore << endl;
    }
    outFile.close();
    cout << "保存成功！" << endl;
}

// 导出学生记录到Excel表格
void exportToExcel() {
    ofstream outFile("students.csv");
    if (outFile.fail()) {
        cout << "导出失败！" << endl;
        return;
    }
    outFile << "姓名,学号,数学成绩,英语成绩,计算机成绩" << endl;
    for (int i = 0; i < studentList.size(); i++) {
        outFile << studentList[i].name << "," << studentList[i].id << ","
                << studentList[i].mathScore << "," << studentList[i].englishScore
                << "," << studentList[i].computerScore << endl;
    }
    outFile.close();
    cout << "导出成功！" << endl;
}

// 从文件中加载学生记录
void loadFromFile() {
    ifstream inFile("students.txt");
    if (inFile.fail()) {
        cout << "加载失败！" << endl;
        return;
    }
    string line;
    while (getline(inFile, line)) {
        stringstream ss(line);
        Student student;
        ss >> student.name >> student.id >> student.mathScore >> student.englishScore >> student.computerScore;
        studentList.push_back(student);
    }
    inFile.close();
    cout << "加载成功！" << endl;
}

int main() {
    int choice;
    loadFromFile();
    while (true) {
        showMenu();
        cout << "请输入操作编号：";
        cin >> choice;
        switch (choice) {
            case 1:
                addStudent();
                break;
            case 2:
                showStudent();
                break;
            case 3:
                searchStudent();
                break;
            case 4:
                deleteStudent();
                break;
            case 5:
                saveToFile();
                break;
            case 6:
                exportToExcel();
                break;
            case 0:
                cout << "感谢使用！" << endl;
                return 0;
            default:
                cout << "无效操作，请重新输入！" << endl;
        }
    }
}

这是一个比较简单的实现，您可以根据自己的需求进行修改和扩展。