用c++做一个学生成绩系统，要能实现学生成绩表的建立、插入、删除、查找、总分的排序的基本操作的实现

好的，这是一个非常典型的基于数据结构的应用，以下是一个简单的 C++ 实现：

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

struct Student {
    int id;
    std::string name;
    int score1;
    int score2;
    int score3;
    int total;
    double average;

    Student(int id_, std::string name_, int score1_, int score2_, int score3_)
        : id(id_), name(name_), score1(score1_), score2(score2_), score3(score3_), total(score1_ + score2_ + score3_), average(total / 3.0) {}
};

class StudentSystem {
public:
    void insert(int id, std::string name, int score1, int score2, int score3) {
        students.push_back(Student(id, name, score1, score2, score3));
    }

    void remove(int id) {
        for (auto it = students.begin(); it != students.end(); it++) {
            if (it->id == id) {
                students.erase(it);
                return;
            }
        }
    }

    Student* find(int id) {
        for (auto& student : students) {
            if (student.id == id) {
                return &student;
            }
        }
        return nullptr;
    }

    void sort() {
        std::sort(students.begin(), students.end(), [](const Student& a, const Student& b) {
            return a.total > b.total;
        });
    }

    void print() {
        std::cout << "ID\tName\tScore1\tScore2\tScore3\tTotal\tAverage" << std::endl;
        for (const auto& student : students) {
            std::cout << student.id << "\t" << student.name << "\t" << student.score1 << "\t" << student.score2 << "\t" << student.score3 << "\t" << student.total << "\t" << student.average << std::endl;
        }
    }

private:
    std::vector<Student> students;
};

int main() {
    StudentSystem system;

    // test insert, remove, find
    system.insert(1, "Alice", 90, 80, 70);
    system.insert(2, "Bob", 80, 70, 60);
    system.insert(3, "Charlie", 70, 60, 50);
    system.print();

    system.remove(2);
    system.print();

    auto student = system.find(3);
    if (student) {
        std::cout << "Found student: " << student->name << std::endl;
    } else {
        std::cout << "Student not found" << std::endl;
    }

    // test sort
    system.insert(4, "David", 60, 50, 40);
    system.insert(5, "Eva", 50, 40, 30);
    system.sort();
    system.print();

    return 0;
}

在这个实现中，`Student` 表示一个学生对象，包含学号、姓名和三科成绩，以及计算得到的总分和平均分。`StudentSystem` 表示学生成绩系统，支持插入、删除、查找、排序和打印学生成绩表的操作。具体实现细节见代码注释。