c++代码学生管理信息系统内容包括添加学生成绩，显示学生成绩记录，查找学生成绩记录，删除学生成绩记录，保存学生成绩记录，导出学生成绩记录

以下是一个简单的学生管理信息系统的C++代码，包括添加学生成绩、显示学生成绩记录、查找学生成绩记录、删除学生成绩记录、保存学生成绩记录和导出学生成绩记录功能：

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

using namespace std;

struct Student {
    string name;
    int score;
};

vector<Student> students;

void addStudent() {
    Student s;
    cout << "Enter student name: ";
    cin >> s.name;
    cout << "Enter student score: ";
    cin >> s.score;
    students.push_back(s);
    cout << "Student added successfully." << endl;
}

void displayStudents() {
    if (students.empty()) {
        cout << "No students found." << endl;
        return;
    }

    cout << "Students:" << endl;
    for (int i = 0; i < students.size(); i++) {
        cout << i+1 << ". " << students[i].name << " - " << students[i].score << endl;
    }
}

void findStudent() {
    if (students.empty()) {
        cout << "No students found." << endl;
        return;
    }

    string name;
    cout << "Enter student name to find: ";
    cin >> name;

    for (int i = 0; i < students.size(); i++) {
        if (students[i].name == name) {
            cout << "Found student: " << students[i].name << " - " << students[i].score << endl;
            return;
        }
    }

    cout << "Student not found." << endl;
}

void deleteStudent() {
    if (students.empty()) {
        cout << "No students found." << endl;
        return;
    }

    string name;
    cout << "Enter student name to delete: ";
    cin >> name;

    for (int i = 0; i < students.size(); i++) {
        if (students[i].name == name) {
            students.erase(students.begin() + i);
            cout << "Student deleted successfully." << endl;
            return;
        }
    }

    cout << "Student not found." << endl;
}

void saveStudents() {
    if (students.empty()) {
        cout << "No students found." << endl;
        return;
    }

    ofstream outfile("students.txt");
    if (!outfile.is_open()) {
        cout << "Unable to open file." << endl;
        return;
    }

    for (int i = 0; i < students.size(); i++) {
        outfile << students[i].name << "," << students[i].score << endl;
    }

    outfile.close();
    cout << "Students saved successfully." << endl;
}

void exportStudents() {
    if (students.empty()) {
        cout << "No students found." << endl;
        return;
    }

    ofstream outfile("students.csv");
    if (!outfile.is_open()) {
        cout << "Unable to open file." << endl;
        return;
    }

    outfile << "Name,Score" << endl;
    for (int i = 0; i < students.size(); i++) {
        outfile << students[i].name << "," << students[i].score << endl;
    }

    outfile.close();
    cout << "Students exported successfully." << endl;
}

int main() {
    int choice;

    while (true) {
        cout << "1. Add student" << endl;
        cout << "2. Display students" << endl;
        cout << "3. Find student" << endl;
        cout << "4. Delete student" << endl;
        cout << "5. Save students" << endl;
        cout << "6. Export students" << endl;
        cout << "7. Exit" << endl;
        cout << "Enter your choice: ";
        cin >> choice;

        switch (choice) {
            case 1:
                addStudent();
                break;
            case 2:
                displayStudents();
                break;
            case 3:
                findStudent();
                break;
            case 4:
                deleteStudent();
                break;
            case 5:
                saveStudents();
                break;
            case 6:
                exportStudents();
                break;
            case 7:
                return 0;
            default:
                cout << "Invalid choice." << endl;
        }

        cout << endl;
    }
}

在这个程序中，我们使用了一个 `vector` 来存储学生信息。用户可以选择添加、显示、查找、删除、保存或导出学生信息。添加和删除操作会更新 `vector` 中的数据，而保存和导出操作会将数据写入文件。程序还包括错误处理，例如在文件无法打开时给出错误提示。