C++简单面向对象学校管理系统

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关键词

类与对象
vector容器
文件输入输出流
排序
运算符重载
人生苦短，我用STL
尽量利用C++的特点，不必重复造轮子
删库跑路

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设计

功能：

• 登录

• 批量添加学生、老师信息

• 查看学生、老师学习

• 学生信息修改，排序，删除

• 保存，读取文件

• 删库跑路

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一、头文件

1.menu.h

//
// Created by Asus on 2021/1/7.
//
#ifndef MAIN_CPP_MENU_H
#define MAIN_CPP_MENU_H

#include
#include
#include
#include "Student.h"
#include "Teacher.h"
#define FILE "file.txt"
using namespace std;
class Menu {
public:
    vector<Student> stu;
    vector<Teacher> tea;

    static void showDirection();

    void addStu();

    void addTea();

    void showStu();

    void showTea();

    void delStu();

    void modStu();

    void clean();

    void sortStu();

    bool isEmpty;

    void save();

    Menu();

    void init();

	friend ostream& operator<<(ostream&, vector<Student>&stud);//运算符重载


};

#endif //MAIN_CPP_MENU_H

2.Login.h

#ifndef MAIN_CPP_LOGIN_H
#define MAIN_CPP_LOGIN_H

#include

using namespace std;

class Login {
private:
    int passwd = 1234;
    string account = "root";
public:
    void login();


};

#endif //MAIN_CPP_LOGIN_H

---

3.People.h

#ifndef MAIN_CPP_PEOPLE_H
#define MAIN_CPP_PEOPLE_H

#include
using namespace std;
class people{
public:
    int id;
    string name;

    virtual void showInfo()=0;//纯虚函数

};
#endif //MAIN_CPP_PEOPLE_H

---

4.Student.h

#ifndef MAIN_CPP_STUDENT_H
#define MAIN_CPP_STUDENT_H
#include

#include "people.h"

using namespace std;


class Student : public people {
private:

public:
    int score;

    void showInfo() override;

    Student(int x, string y, int z);

    ~Student();

};


#endif //MAIN_CPP_STUDENT_H

---

5.Teacher.h

#ifndef MAIN_CPP_TEACHER_H
#define MAIN_CPP_TEACHER_H

#include "people.h"

class Teacher: public people{

public:
    void showInfo() override;//虚函数重写
    Teacher(int x,string y);

};
#endif //MAIN_CPP_TEACHER_H

---

二、源文件

1.main.cpp

/**
* Copyright (c) 2021,
* All rights reserved.
* 文件名称：student.cpp
* 作者：Horace
* 完成日期：2021年1月11日
* 版本号：8.05
*
* 问题描述：学生信息管理系统
 * 需要完成的功能至少有：学生成绩的输入和输出、
 * 老师信息的输入和输出、老师能够输入、查询并修改学生的成绩、
 *
*/

#include
#include 
#include "head/Login.h"
#include "head/Menu.h"
using namespace std;

int main() {
    //登录
    Login log;
    log.login();

    int direc;//创建指令

    Menu menu;//创建对象

    while (true) {
        Menu::showDirection();//直接通过类本身来访问静态成员
        cin >> direc;
        switch (direc) {
            case 0://退出系统
                //保存信息
                menu.save();
                exit(0);
            case 1://增加学生信息
                menu.addStu();
                break;
            case 2://增加老师信息
                menu.addTea();
                break;
            case 3://显示学生信息
                menu.showStu();
                break;
            case 4://显示老师信息
                menu.showTea();
                break;
            case 5://排序
                menu.sortStu();
                break;
            case 6://删除学生信息
                menu.delStu();
                break;
            case 7://修改学生信息
                menu.modStu();
                break;
            case 8://删库跑路
                menu.clean();
            default:
                cout << "请输入正确指令";

        }
        system("pause");
        system("cls");

    }


}

---

2. Student.cpp

#include 

#include "head/Student.h"


void Student::showInfo() {
    cout << "学生id：" << id << "\t name:" << name << "\t score:" << score << endl;


}

Student::~Student() = default;

Student::Student(int x, string y, int z) {
    id=x;
    name=std::move(y);//多使用右值引用，可以通过 std::move 将参数转化为右值引用
    score=z;

}

---

3. Teacher.cpp

//
// Created by Asus on 2021/1/7.
//
#include "head/Teacher.h"
#include
using namespace std;


void Teacher::showInfo() {
    cout << "老师id: "<<id<<"\t name: "<<name<<endl;

}

Teacher::Teacher(int x, string y) {
    id=x;
    name=std::move(y);//多使用右值引用，可以通过 std::move 将参数转化为右值引用

}

---

4. Login.cpp

#include 
#include 
#include "../head/Login.h"

void Login::login() {
    while (true) {
        string m_account;
        int m_passwd;
        cout << "============请登录=========="<<endl;
        cout << "| 帐号：  ";
        cin>>m_account;
        cout << "| 密码：  ";
        cin>>m_passwd;
        if(m_account==account &&m_passwd==passwd){
            cout << "登录成功";
            Sleep(500);
            system("cls");
            break;
        }
        cout << "\n请重新输入";
    }


}

---

5. Menu.cpp

//
// Created by Asus on 2021/1/7.
//

#include "head/Menu.h"
#include
#include
#include 
#include 
#include 
using namespace std;
ostream& operator<<(ostream&, vector<Student>& stud){//运算符重载
    for (auto i:stud) {
        i.showInfo();
    }

}

bool NameUp(const Student &a, const Student &b) {
    return a.name < b.name;
}

bool IdUp(const Student &a, const Student &b) {
    return a.id < b.id;
}

bool ScoreDown(const Student &a, const Student &b) {
    return a.score > b.score;
}

bool ScoreUp(const Student &a, const Student &b) {
    return a.score < b.score;
}



void Menu::showDirection() {

    cout << "      欢迎使用学校管理系统 v8.0      " << endl;
    cout << "=====================================" << endl;
    cout << "******---|0.退出并保存系统|---*******\n";
    cout << "==============  添加  ===============\n";
    cout << "******---| 1.增加学生信息 |---*******\n";
    cout << "******---| 2.增加老师信息 |---*******\n";
    cout << "==============  显示  ===============\n";
    cout << "******---| 3.显示学生信息 |---*******\n";
    cout << "******---| 4.显示老师信息 |---*******\n";
    cout << "******---| 5.学生信息排序 |---*******\n";
    cout << "==============  修改  ===============\n";
    cout << "******---| 6.删除学生信息 |---*******\n";
    cout << "******---| 7.修改学生信息 |---*******\n";
    cout << "******---| 8.删!库!跑!路! |---*******\n";
    cout << "*请输入指令*\n";

}


void Menu::addStu() {
    int num;
    cout << "请输入增加学生的数量" << endl;
    cin >> num;

    for (int i = 0; i < num; i++) {
        int id;
        string name;
        int score;
        cout << "请输入学生id" << endl;
        cin >> id;
        cout << "请输入学生姓名" << endl;
        cin >> name;
        cout << "请输入学生成绩" << endl;
        cin >> score;
        Student temp(id, name, score);
        stu.push_back(temp);
    }
    isEmpty = false;
    system("cls");
    showDirection();
    showStu();
    cout << "添加成功！" << endl;
}

void Menu::addTea() {
    int num;
    cout << "请输入增加老师的数量" << endl;
    cin >> num;

    for (int i = 0; i < num; i++) {
        int id;
        string name;

        cout << "请输入老师id" << endl;
        cin >> id;
        cout << "请输入老师姓名" << endl;
        cin >> name;
        Teacher temp(id, name);
        tea.push_back(temp);
    }
    isEmpty = false;
    system("cls");
    showDirection();
    showTea();
    cout << "添加成功！" << endl;
}

void Menu::showStu() {
    cout<<stu;//运算符已重载
}

void Menu::showTea() {

    for (auto i:tea) {
        i.showInfo();
    }
}

void Menu::delStu() {
    showStu();
    cout << "输入删除学生的id" << endl;
    int delId;
    cin >> delId;

    for (int i = 0; i <= stu.size(); i++) {
        if (delId == stu[i].id)
            stu.erase(stu.begin() + i);
    }
    system("cls");
    showDirection();
    showStu();
    cout << "删除成功！" << endl;
}

void Menu::modStu() {
    showStu();
    cout << "输入要修改的学生的id" << endl;
    int Id;
    cin >> Id;

    for (auto &i:stu) {
        if (Id == i.id) {
            cout << "请输入新的成绩" << endl;
            cin >> i.score;
            break;
        }

    }
    system("cls");
    showDirection();
    showStu();
    cout << "修改成功！" << endl;


}

void Menu::sortStu() {
    showStu();
    cout << " 请输入排序方式" << endl;
    cout << "1.成绩降序    2.成绩升序   3.姓名升序    4.id升序" << endl;
    int x;
    cin >> x;
    if (x == 1) {
        sort(stu.begin(), stu.end(), ScoreDown);
    }

    if (x == 2) {
        sort(stu.begin(), stu.end(), ScoreUp);
    }
    if (x == 3) {
        sort(stu.begin(), stu.end(), NameUp);
    }
    if (x == 4) {
        sort(stu.begin(), stu.end(), IdUp);
    }
    system("cls");
    showDirection();
    showStu();
}

void Menu::save() {
    ofstream ofs;
    ofs.open(FILE, ios::out);//写入文件

    for (const auto &i:stu)
        ofs << "学生 " << i.id << " " << i.name << " " << i.score << endl;
    for (const auto &i:tea)
        ofs << "老师 " << i.id << " " << i.name << " " << 0 << endl;

    ofs.close();//关闭文件


}

Menu::Menu() {
    ifstream ifs;
    //读文件
    ifs.open(FILE, ios::in);
    //假如文件不存在
    if (!ifs.is_open()) {
        isEmpty = true;
        ifs.close();
        return;
    }
    //假设文件存在为空
    char ch;
    ifs >> ch;
    if (ifs.eof()) {
        ifs.close();
        return;

    }

   //文件存在
    init();

}


void Menu::init() {
    ifstream ifs;
    ifs.open(FILE, ios::in);

    int id;
    int score;
    string name;
    string dId;

    while (ifs >> dId && ifs >> id && ifs >> name && ifs >> score) {
        if (dId == "学生") {
            stu.emplace_back(id, name, score);
        } else {
            tea.emplace_back(id, name);
        }
    }
    ifs.close();


}


void Menu::clean() {
    system("cls");
    cout << "根据《中华人民共和国刑法》第二百八十六条第一款、第二款:" << endl;
    cout << "对计算机信息系统中存储的数据和应用程序进行删除，造成计算机信息系统不能正常运行，后果特别严重，其行为已构成破坏计算机信息系统罪，依法应予惩处。" << endl;
    cout << "是否继续删库？  1.确定  2.取消" << endl;
    int x;
    cin >> x;
    if (x == 1) {
        unsigned seed = chrono::high_resolution_clock::now().time_since_epoch().count();
        mt19937 rand_generator(seed);
        mt19937 rand_generator1(seed);
        uniform_int_distribution<int> dist(50, 700);
        uniform_int_distribution<int> dist1(4, 15);
        stu.clear();
        tea.clear();
        for (int i = 0; i < 3; i++) {
            cout << "删除成功 rm -rf */ sys/module/drm/section/__kcrctab:operator permitted" << endl;
            cout << "删除成功 rm -rf */ sys/module/drm/section/.text.unlikely':operator permitted" << endl;
            cout << "删除成功 rm -rf */ sys/module/drm/section/. rodata':operator permitted" << endl;
            cout << "正在删除 sys/module/drm/section/. ref.data'";
            for (int j = 0; j < dist1(rand_generator1); j++) {
                cout << "■";
                Sleep(dist(rand_generator));
            }
            cout << "\n删除成功 rm -rf */ sys/module/drm/section/. ref.data'::operator permitted" << endl;
            Sleep(dist(rand_generator));
            cout
                    << "删除成功 rm -rf */ /usr/lib64/qt-3.3/bin:/usr/local/bin:/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/sbin:/home/dean/bin'::operator permitted"
                    << endl;
            Sleep(dist(rand_generator));
            cout
                    << "删除成功 rm -rf */ /usr/lib64/qt-3.3/bin:/usr/usr/local/sbin:/usr/sbin:/sbin:/home/dean/bin'::operator permitted"
                    << endl;
            cout
                    << "删除成功 rm -rf */ /usr/lib64/qt-/etc/alternatives/java -> /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.242.b08-0.el7_7.x86_64/jre/bin/'::operator permitted"
                    << endl;
            cout << "删除成功 rm -rf */ sys/module/drm/section/__ex_table':operator permitted" << endl;
            cout << "删除成功 rm -rf */ sys/module/drm/section/.smp_locks:operator permitted" << endl;
            cout << "删除成功 rm -rf */ sys/module/drm/parameters/vblankoffdelay.:operator permitted" << endl;
            Sleep(dist(rand_generator));
            cout << "删除成功 rm -rf */ sys/block/drm/parameters/timestamp_precision_usec':operator permitted" << endl;
            cout << "删除成功 rm -rf */ sys/block/drm/section/__kcrctab:operator permitted" << endl;
            cout << "删除成功 rm -rf */ sys/block/drm-0/section/__kcrctab:operator permitted" << endl;
            cout << "删除成功 rm -rf */ sys/block/vda':operator permitted" << endl;
        }
        system("cls");
        cout << "删库成功，赶紧跑路！" << endl;
    } else {
        cout << "取消成功，继续打工！";
    }
}

---

三.效果图

1.登录界面

2.添加

添加学生


添加老师

追加学生

3.修改

4.查看

成绩降序


姓名升序


id升序

6.保存

7.读取txt

8.删库跑路