C++之基于多态的管理系统
案例来源于：
https://www.bilibili.com/video/BV1et411b73Z?p=167&vd_source=0475e9436337406639ae97cc3cfcc136
实现功能：
增、删、改、查、排序，清空、退出系统
代码如下：
1.主函数
#include#include"employee.h" #include"manager.h" #include"boss.h" #include "workerManager.h" using namespace std; int main() { WorkerManager wm; int choice = 0; while (true) { wm.Show_Menu(); cout << "请输入你的选择" << endl; cin >> choice; switch (choice) { case 0: //退出系统 wm.exitSystem(); break; case 1: //添加 wm.Add_Emp(); break; case 2: //显示 wm.Show_Emp(); break; case 3: //删除 { int ret = wm.isExist(1); if (ret != -1) { cout << "职工存在" << endl; } else { cout << "不存在" << endl; } wm.Del_Emp(); break; } case 4: //修改 wm.Mod_Emp(); break; case 5: //查找 wm.Find_Emp(); break; case 6: //排序 wm.Sort_Emp(); break; case 7: //清空 wm.Clean_File(); break; default: cout << "不是有效指令，请重新输入：" << endl; system("cls"); break; } } system("pause"); return 0; }
2.boss.cpp文件
#include"boss.h"
Boss::Boss(int id, string name, int dId)
{
this->m_Id = id;
this->m_name = name;
this->m_DeptId = dId;
}
void Boss::showInfo()
{
cout << "职工编号" << this->m_Id
<< "t职工姓名" << this->m_name
<< "t岗位" << this->m_DeptId
<< "t制定公司规划，并向经理交接任务" << endl;
}
string Boss::getDepName()
{
return string("Boss");
}
boss.h文件
#pragma once #include#include"worker.h" #include using namespace std; class Boss : public Worker { public: Boss(int id, string name, int dId); virtual void showInfo(); virtual string getDepName(); };
3.manager.cpp文件
#include"manager.h"
Manager::Manager(int id, string name, int dId)
{
this->m_Id = id;
this->m_name = name;
this->m_DeptId = dId;
}
void Manager::showInfo()
{
cout << "职工编号" << this->m_Id
<< "t职工姓名" << this->m_name
<< "t岗位" << this->m_DeptId
<< "t完成管理任务，并辅助完成生产任务" << endl;
}
string Manager::getDepName()
{
return string("经理");
}
manager.h文件
#pragma once #include#include"worker.h" #include using namespace std; class Manager : public Worker {public: Manager(int id, string name, int dId); virtual void showInfo(); virtual string getDepName(); };
4.employee.cpp
#include"employee.h"
Employee::Employee(int id, string name, int dId)
{
this->m_Id = id;
this->m_name = name;
this->m_DeptId = dId;
}
void Employee::showInfo()
{
cout << "职工编号" << this->m_Id
<< "t职工姓名" << this->m_name
<< "t岗位" << this->m_DeptId
<< "t完成生产任务" << endl;
}
string Employee::getDepName()
{
return string("employee");
}
employee.h文件
#pragma once #include#include"worker.h" #include using namespace std; class Employee :public Worker { public: Employee(int id, string name, int dId); virtual void showInfo(); virtual string getDepName(); };
5.worker.h 头文件
#pragma once #include#include using namespace std; class Worker { public: virtual void showInfo() = 0; virtual string getDepName() = 0; int m_Id; string m_name; int m_DeptId; };
6.wokerManager.cpp文件
/1.菜单界面
//2.增删改查
//3.与文件进行交互
//使用父类指针指向子类，在堆区开辟空间保存父类指针。
#include "workerManager.h";
WorkerManager::WorkerManager()
{
this->m_EmpNum = 0;
this->m_EmpArray = NULL;
int num = this->get_EmpNum();
cout << "已有数量为：" <m_EmpNum = num;
ifstream ifs;
ifs.open(FILENAME, ios::in);
if (!ifs.is_open())//如果文件不存在
{
cout << "文件不存在！！！" << endl;
this->m_EmpNum = 0;
this->m_FileIsEmpty = true;
this->m_EmpArray = NULL;
ifs.close();
return;
}
char ch;
ifs >> ch;
if (ifs.eof())
{
cout << "文件为空！" << endl;
this->m_EmpNum = 0;
this->m_FileIsEmpty = true;
this->m_EmpArray = NULL;
ifs.close();
return;
}
this->m_EmpArray = new Worker *[this->m_EmpNum];
init_Emp();
for (int i = 0; i < m_EmpNum; i++)
{
cout << "职工号： " << this->m_EmpArray[i]->m_Id
<< "职工姓名：" << this->m_EmpArray[i]->m_name
<< "部门编号： " << this->m_EmpArray[i]->m_DeptId << endl;
}
}
void WorkerManager::Show_Menu()
{
cout << "*********************************************************" << endl;
cout << "*********************欢迎使用管理系统********************" << endl;
cout << "**********************0.退出管理系统*********************" << endl;
cout << "**********************1.增加职工信息*********************" << endl;
cout << "**********************2.显示职工信息*********************" << endl;
cout << "**********************3.删除离职职工*********************" << endl;
cout << "**********************4.修改职工信息*********************" << endl;
cout << "**********************5.查找职工信息*********************" << endl;
cout << "**********************6.按照编号排序*********************" << endl;
cout << "**********************7.清空所有文档*********************" << endl;
cout << "*********************************************************" << endl;
}
void WorkerManager::exitSystem()
{
cout << " *已成功退出* " << endl;
cout << "**欢迎下次使用**" << endl;
system("pause");
exit(0);
}
void WorkerManager::Add_Emp()
{
cout << "请输入新添加的数量：" << endl;
int addNum = 0;
cin >> addNum;
if (addNum > 0)
{
//计算需要开辟的空间的大小
int newSize = this->m_EmpNum + addNum;
//在堆区开辟空间
Worker ** newSpace = new Worker*[newSize];
//将原空间内容存放到新空间下
if (this->m_EmpArray != NULL)
{
for (int i = 0; i < this->m_EmpNum; i++)
{
newSpace[i] = this->m_EmpArray[i];
}
}
for (int i = 0; i < addNum; i++)
{
int id;
string name;
int dSelect;
cout << "请输入第 " << i + 1 << " 个新职工编号: " << endl;
cin >> id;
cout << "请输入第 " << i + 1 << " 个新职工姓名:" << endl;
cin >> name;
cout << "请输入该职工岗位: " << endl;
cout << "1.普通员工" << endl;
cout << "2.管理人员" << endl;
cout << "3.Big Boss" << endl;
cout << "根据岗位，请输入岗位编号：" << endl;
cin >> dSelect;
Worker *worker = NULL;
switch (dSelect)
{
case 1:
worker = new Employee(id, name, 1);
break;
case 2:
worker = new Manager(id, name, 2);
break;
case 3:
worker = new Boss(id, name, 3);
break;
default:
break;
}
newSpace[this->m_EmpNum + i] = worker;
}
//释放原来的空间
delete[]this->m_EmpArray;
//更改新空间的指向
this->m_EmpArray = newSpace;
//更新新的个数
this->m_EmpNum = newSize;
cout << "成功添加" << addNum << " 名新职员" << endl;
this->save();
}
else
{
cout << "输入有误!!!" << endl;
}
system("pause");
system("cls");
}
void WorkerManager::save()
{
ofstream ofs;
ofs.open(FILENAME,ios::out);
for (int i = 0; i < this->m_EmpNum; i++)
{
ofs << this->m_EmpArray[i]->m_Id << " "
<< this->m_EmpArray[i]->m_name << " "
<< this->m_EmpArray[i]->m_DeptId << endl;
}
ofs.close();
}
//获得原文件信息
int WorkerManager::get_EmpNum()
{
ifstream ifs;
ifs.open(FILENAME, ios::in);
int id; string name; int dId;
int num = 0;
while (ifs>>id&&ifs>>name&&ifs>>dId)
{
num++;
}
ifs.close();
return num;
}
void WorkerManager::init_Emp()
{
ifstream ifs;
ifs.open(FILENAME, ios::in);
int id; string name; int dId;
int index = 0;
while (ifs >> id && ifs >> name && ifs >> dId)
{
Worker * worker = NULL;
if (dId == 1)
{
worker = new Employee(id, name, dId);
}
else if (dId == 2)
{
worker = new Manager(id, name, dId);
}
else
{
worker = new Boss(id, name, dId);
}
this->m_EmpArray[index] = worker;
index++;
}
}
void WorkerManager::Show_Emp()
{
if (this->m_FileIsEmpty)
{
cout << "文件记录不存在或者记录为空" << endl;
}
else
{
for (int i = 0; i < this->m_EmpNum; i++)
{
this->m_EmpArray[i]->showInfo();
}
}
system("pause");
system("cls");
}
void WorkerManager::Del_Emp()
{
if (this->m_FileIsEmpty)
{
cout << "文件不存在" << endl;
}
else
{
cout << "请输入需要删除的职工编号：" << endl;
int id = 0;
cin >> id;
int index=this->isExist(id);
if (index!=-1)
{
for (int i = 0; i < this->m_EmpNum-1; i++)
{
this->m_EmpArray[i]= this->m_EmpArray[i+1];
}
this->m_EmpNum--;
this->save();
cout << "删除成功！！！" << endl;
}
else { cout << "删除失败，当前编号不存在" << endl; }
system("pause");
system("cls");
}
//isExit(id);
}
int WorkerManager::isExist(int id)
{
int index = -1;
for (int i = 0; i < this->m_EmpNum; i++)
{
if (this->m_EmpArray[i]->m_Id == id)
{
index = i;
break;
}
}
return index;
}
void WorkerManager::Mod_Emp()
{
if (this->m_FileIsEmpty)
{
cout << "当前文件不存在！！！" << endl;
}
else
{
cout << "请输入需要修改的职工的编号信息：" << endl;
int id = 0;
cin >> id;
int ret=this->isExist(id);
if (ret!=-1)
{
delete this->m_EmpArray[ret];
int newId = 0;
string newName = "";
int dSelect = 0;
cout << "查到：" << id<<" 号职工，请输入新职工号"<> newId;
cout << "请输入名字：" << endl;
cin >> newName;
cout << "请输入该职工岗位: " << endl;
cout << "1.普通员工" << endl;
cout << "2.管理人员" << endl;
cout << "3.Big Boss" << endl;
cout << "根据岗位，请输入岗位编号：" << endl;
cin >> dSelect;
Worker *worker = NULL;
switch (dSelect)
{
case 1:
worker = new Employee(newId, newName, 1);
break;
case 2:
worker = new Manager(newId, newName, 2);
break;
case 3:
worker = new Boss(newId, newName, 3);
break;
default:
break;
}
this->m_EmpArray[ret] = worker;
cout << "修改成功！！！" << endl;
cout << this->m_EmpArray[ret]->m_DeptId << endl;
this->save();
}
else
{ cout << "修改失败，未查询到相关信息！！！" << endl; }
}
system("pause");
system("cls");
}
void WorkerManager::Find_Emp()
{
if (this->m_FileIsEmpty)
{
cout << "当前文件不存在！！！" << endl;
}
else
{
cout << "请输入查找的方式：" << endl;
cout << "1.按照编号"<< endl;
cout << "2.按照姓名" << endl;
cout << "请输入你选择的查询方式：" << endl;
int select = 0;
cin >> select;
if (select==1)
{
int id;
cout << "请输入需要查找的员工编号：" << endl;
cin >> id;
int ret = this->isExist(id);
if (ret != -1)
{
cout << "查找成功！" << endl;
this->m_EmpArray[ret]->showInfo();
}
else { cout << "查找失败，查无此人" << endl; }
}
else if (select=2)
{
string name;
cout << "请输入姓名:" << endl;
cin >> name;
bool flag = false;
for (int i = 0; i < this->m_EmpNum; i++)
{
if (m_EmpArray[i]->m_name==name)
{
cout << "查询成功！！！" << endl;
cout << "职工编号为：" << " "
<< m_EmpArray[i]->m_Id << " "
<< "的信息如下：" << endl;
flag = true;
this->m_EmpArray[i]->showInfo();
}
}
if (flag = false)
{
cout << "查询无果..." << endl;
}
}
else { cout << "输入结果有误..." << endl; }
}
system("pause");
system("cls");
}
void WorkerManager::Sort_Emp()
{
if (this->m_FileIsEmpty)
{
cout << "当前文件不存在！！！" << endl;
system("pause");
system("cls");
}
else
{
cout << "请输入排序的方式：" << endl;
cout << "1.升序" << endl;
cout << "2.降序" << endl;
cout << "请输入你选择的排序方式：" << endl;
int select = 0;
cin >> select;
for (int i = 0; i < this->m_EmpNum; i++)
{
int minOrMax = i;
for (int j = i; j < this->m_EmpNum; j++)
{
if (select==1)
{
if (m_EmpArray[i]->m_Id>m_EmpArray[j]->m_Id)
{
minOrMax = j;
}
}
else
{
if (m_EmpArray[i]->m_Id < m_EmpArray[j]->m_Id)
{
minOrMax = j;
}
}
}
if (i!=minOrMax)
{
Worker *temp = m_EmpArray[i];
m_EmpArray[i] = m_EmpArray[minOrMax];
m_EmpArray[minOrMax] = temp;
}
}
cout << "排序成功！" << endl;
this->save();
this->Show_Emp();
}
}
void WorkerManager::Clean_File()
{
cout << "正在执行清空操作：" << endl;
cout << "1.继续执行" << endl;
cout << "2.取消执行" << endl;
int select = 0;
cout<<"请选择你的操作："<> select;
if (select=1)
{
ofstream ofs(FILENAME, ios::trunc);
ofs.close();
if (this->m_EmpArray!=NULL)
{
for (int i = 0; i < this->m_EmpNum; i++)
{
if (this->m_EmpArray[i]!=NULL)
{
delete this->m_EmpArray[i];
}
}
this->m_EmpNum = 0;
delete[] this->m_EmpArray;
this->m_EmpArray = NULL;
this->m_FileIsEmpty = true;
}
cout << "清空成功！！" << endl;
}
system("pause");
system("cls");
}
//释放空间
WorkerManager::~WorkerManager()
{
if (this->m_EmpArray!=NULL)
{
delete[] this->m_EmpArray;
this->m_EmpArray = NULL;
}
}
wokerManager.h文件
#pragma once//防止头文件重复包含 #include#include #include"worker.h" #include"employee.h" #include"manager.h" #include"boss.h" #include using namespace std; #define FILENAME "empFile.txt" class WorkerManager { public: //构造函数 WorkerManager(); void Show_Menu(); void save(); void exitSystem(); //析构函数 ~WorkerManager(); int m_EmpNum; bool m_FileIsEmpty; int get_EmpNum(); Worker ** m_EmpArray; void Add_Emp(); void init_Emp(); void Show_Emp(); void Del_Emp(); int isExist( int id); void Mod_Emp(); void Find_Emp(); void Sort_Emp(); void Clean_File(); };
功能0：退出系统
功能1：
功能2
功能3：
功能4：
功能5：按照编号，按照姓名
功能6：1.升序，2降序
功能7：
