利用C++实现基于多态的职工管理系统。

boos.h

employee.h

manage.h

worker.h

workermanager.h

boss.cpp

employee.cpp

manage.h

workermanager.cpp

系统需求：

公司员工分为三种：普通员工，经理，老板。

显示信息时要显示职工编号，职工姓名，职工岗位，以及职责。

管理系统需要实现的功能如下：

• 退出管理系统
• 增加职工信息
• 显示职工信息
• 删除离职员工
• 修改职工信息
• 查找职工信息
• 按照编号排序
• 清空所有文档

boos.h

#pragma once
#include<iostream>
using namespace std;
#include"worker.h"

//老板类
class Boss :public Worker
{
public:
	//构造函数
	Boss(int id, string name, int did);

	//显示个人信息
	virtual void showInfo();

	//显示岗位名称
	virtual string getDeptName();
};

employee.h

#pragma once
#include<iostream>
using namespace std;
#include"worker.h"

class Employee :public Worker
{
public:
	//构造函数
	Employee(int id,string name,int did);

	//显示个人信息
	virtual void showInfo();

	//显示岗位名称
	virtual string getDeptName();
};

manage.h

#pragma once
#include<iostream>
using namespace std;
#include "worker.h"

//经理类
class Manager :public Worker
{
public:
	//构造函数
	Manager(int id,string name,int dId);

	//显示个人信息
	virtual void showInfo();
	//显示岗位名称
	virtual string getDeptName();
};

worker.h

#pragma once
#include<iostream>
#include<string>
using namespace std;

//职工抽象类
class Worker
{
public:
	//显示个人信息
	virtual void showInfo() = 0;
	//显示岗位名称
	virtual string getDeptName() = 0;

	int m_Id;
	string m_Name;
	int m_DeptId;
};

workermanager.h

#pragma once	//防止文件重复包含
#include<iostream>
#include"worker.h"
using namespace std;
#include"employee.h"
#include"manage.h"
#include"boss.h"
#include"fstream"
#define FILENAME "empFile.txt"

class WorkerManager
{
public:
	WorkerManager();		//构造函数

	void Show_Menu();	//显示菜单

	void ExitSystem();	//退出系统

	int m_EmpNum;	//记录职工人数

	Worker ** m_EmpArray;	//职工数组指针

	void Add_Emp();		//添加职工

	void save();	//保存文件

	bool m_FileIsEmpty;		//判断文件是否为空

	int get_EmpNum();	//统计文件中的人数

	void init_Emp();	//初始化员工

	void Show_Emp();	//显示职工

	int IsExist(int id);	//判断职工是否存在

	void Del_Emp();		//删除职工

	void Mod_Emp();		//修改职工

	void Find_Emp();	//查找职工

	void Sort_Emp();	//排序

	void Clean_File();	//清空文件

	~WorkerManager();	//析构函数
	

};

boss.cpp

#include "boss.h"

//构造函数
Boss::Boss(int id, string name, int dId)
{
	this->m_Name = name;
	this->m_Id = id;
	this->m_DeptId = dId;
}

//显示个人信息
void Boss::showInfo()
{
	cout << "职工编号：" << this->m_Id
		<< "\t职工姓名：" << this->m_Name
		<< "\t岗位：" << this->getDeptName()
		<< "\t岗位职责：带领公司走向辉煌" << endl;
}

//显示岗位名称
string Boss::getDeptName()
{
	return string("老板");
}

employee.cpp

#include"employee.h"

//构造函数
Employee::Employee(int id, string name, int dId)
{
	this->m_Name = name;
	this->m_Id = id;
	this->m_DeptId = dId;
}

//显示个人信息
void Employee::showInfo()
{
	cout << "职工编号：" << this->m_Id
		<< "\t职工姓名：" << this->m_Name
		<< "\t岗位：" << this->getDeptName()
		<<"\t岗位职责：完成经理交给的任务" << endl;
}

//显示岗位名称
string Employee::getDeptName()
{
	return string("员工");
}

manage.h

#include"manage.h"

//构造函数
Manager::Manager(int id, string name, int dId)
{
	this->m_Name = name;
	this->m_Id = id;
	this->m_DeptId = dId;
}

//显示个人信息
void Manager::showInfo()
{
	cout << "职工编号：" << this->m_Id
		<< "\t职工姓名：" << this->m_Name
		<< "\t岗位：" << this->getDeptName()
		<< "\t岗位职责：完成老板交付的任务，并给普通员工下发任务" << endl;
}
//显示岗位名称
string Manager::getDeptName()
{
	return string("经理");
}

workermanager.cpp

#include"WorkerManager.h"

WorkerManager::WorkerManager()
{

	//1,文件不存在
	ifstream ifs;
	ifs.open(FILENAME, ios::in);	//读文件

	if (!ifs.is_open())
	{
		cout << "文件不存在" << endl;
		//初始化属性
		//初始化记录人数
		this->m_EmpNum = 0;
		//初始化数组指针
		this->m_EmpArray = NULL;
		//初始化文件是否为空
		this->m_FileIsEmpty = true;
		ifs.close();
		return;
	}

	//2,文件存在，数据为空
	char ch;
	ifs >> ch;
	if (ifs.eof())
	{
		//文件为空
		cout << "文件为空！" << endl;
		//初始化记录人数
		this->m_EmpNum = 0;
		//初始化数组指针
		this->m_EmpArray = NULL;
		//初始化文件是否为空
		this->m_FileIsEmpty = true;
		ifs.close();
		return;
	}

	//3,文件存在，并且记录数据
	int num = this->get_EmpNum();
	cout << "职工人数为：" << num << endl;
	this->m_EmpNum = num;

	//开辟空间
	this->m_EmpArray = new Worker * [this->m_EmpNum];
	//将文件的主句存放再数组中
	this->init_Emp();


	//测试代码
	/*for (int i=0; i < this->m_EmpNum; i++)
	{
		cout << "职工编号：" << this->m_EmpArray[i]->m_Id
			<< "姓名：" << this->m_EmpArray[i]->m_Name
			<< "部门编号：" << this->m_EmpArray[i]->m_DeptId << endl;
	}*/


}

//显示界面
void WorkerManager::Show_Menu()
{
	cout << "********************************" << endl;
	cout << "******欢迎使用职工管理系统******" << endl;
	cout << "********0，退出管理程序********" << endl;
	cout << "********1，增加职工信息********" << endl;
	cout << "********2，显示职工信息********" << endl;
	cout << "********3，删除离职员工********" << 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;
	cout  << endl;
}

//退出功能
void WorkerManager::ExitSystem()
{
	cout << "欢迎下次使用" << endl;
	system("pause");
	exit(0);
}

//添加职工
void WorkerManager::Add_Emp()
{
	cout << "请输入添加职工数量" << endl;

	int addNum = 0;
	cin >> addNum;

	if (addNum > 0)
	{
		//计算添加新空间的大小
		int newSize = this->m_EmpNum + addNum;		//原来记录人数+新增加人数

		//开辟新空间
		Worker** newSpace = new Worker * [newSize];

		//将原来空间下的数据拷贝到新空间下
		if (this->m_EmpArray != NULL)
		{
			for (int i = 0; i < this->m_EmpNum; i++)
			{
				newSpace[i] = this->m_EmpArray[i];
			}
		}

		//批量添加数据
		for (int i = 0; i < addNum; i++)
		{
			int id;
			string name;
			int dSelete;	//部门选择

			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 << "请选择该职工岗位：" << endl;
			cout << "1，普通职工" << endl;
			cout << "2，经理" << endl;
			cout << "3，老板" << endl;
			cin >> dSelete;

			Worker* worker = NULL;
			switch (dSelete)
			{
			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);
			default:
				break;
			}

			//将创建职工职责，保存到数组中
			newSpace[this->m_EmpNum + i] = worker;

		}

		//释放原有空间
		delete[] this->m_EmpArray;

		//更改新空间的指向
		this->m_EmpArray = newSpace;

		//更新职工人数
		this->m_EmpNum = newSize;

		//更新职工不为空标志
		this->m_FileIsEmpty = false;

		cout << "成功添加" << addNum << "名新职工" << endl;

		//保存数据到文件中
		this->save();
	}
	else
	{
		cout << "输入数据有误" << endl;
	}
	system("pause");
	system("cls");
}

//保存文件
void WorkerManager::save()
{
	ofstream ofs;
	ofs.open(FILENAME, ios::out);	//写文件

	//将每个人的数据写入文件中
	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;
	}
	//关闭文件
	ofs.close();
}

//统计文件中的人数
int WorkerManager::get_EmpNum()
{
	ifstream ifs;
	ifs.open(FILENAME, ios::in);	//读文件

	int id;
	string name;
	int dId;

	int num=0;
	while (ifs >> id && ifs >> name && ifs >> dId)
	{
		//统计人数
		num++;
	}
	return num;
}

//初始化员工
void WorkerManager::init_Emp()
{
	ifstream ifs;
	ifs.open(FILENAME, ios::in);	//读文件

	int id;
	string name;
	int dId;

	int index = 0;
	while (ifs >> id && ifs >> name && ifs >> dId)
	{
		Worker* worker = NULL;

		if (dId==1)		//普通职工
		{
			worker = new Employee(id, name, dId);
		}
		else if (dId == 2)		//经理
		{
			worker = new Manager(id, name, dId);
		}
		else if (dId == 3)		//老板
		{
			worker = new Boss(id, name, dId);
		}
		this->m_EmpArray[index] = worker;
		index++;
	}
	//关闭文件
	ifs.close();
}

//显示职工
void WorkerManager::Show_Emp()
{
	if (this->m_FileIsEmpty)
	{
		cout << "文件不存在或记录为空" << endl;
	}
	else
	{
		for (int i = 0; i < this->m_EmpNum; i++)
		{
			//利用多态调用程序接口
			this->m_EmpArray[i]->showInfo();
		}
	}

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

//判断职工是否存在
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;
}

//删除职工
void WorkerManager::Del_Emp()
{
	if (this->m_FileIsEmpty)
	{
		cout << "文件不存在或记录为空" << endl;
	}
	else
	{
		cout << "请输入要删除的职工编号：" << endl;
		int id = 0;
		cin >> id;

		int index = this->IsExist(id);

		if (index != -1)	//职工存在
		{
			for (int i = index; i < this->m_EmpNum - 1; i++)
			{
				this->m_EmpArray[i] = this->m_EmpArray[i + 1];
			}
			this->m_EmpNum--;	//更新数组中记录的人员个数

			this->save();	//数据同步更新
			cout << "删除成功！" << endl;
		}
		else
		{
			cout << "删除失败，未找到该职工" << endl;
		}
	}
	system("pause");
	system("cls");
}	

//修改职工
void WorkerManager::Mod_Emp()
{
	if (this->m_FileIsEmpty)
	{
		cout << "文件不存在或记录为空" << endl;
	}
	else
	{
		cout << "请输入要修改的职工编号：" << 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：" << endl;
			cin >> newId;

			cout  << "请输入新姓名：" << endl;
			cin >> newName;

			cout << "请输入岗位：" << endl;
			cout << "1，普通职工" << endl;
			cout << "2，经理" << endl;
			cout << "3，老板" << 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);
			default:
				break;
			}

			//更新数据到数组中
			this->m_EmpArray[ret] = worker;

			cout << "修改成功" << endl;
			this->save();
		}
		else
		{
			cout << "修改失败，查无此人！" << endl;
		}
	}
	system("pause");
	system("cls");
}

//查找职工
void WorkerManager::Find_Emp()
{
	if (this->m_FileIsEmpty)
	{
		cout << "文件不存在或记录为空" << endl;
	}
	else
	{
		cout << "请输入查找方式：" << endl;
		cout << "1,按照职工编号查找：" << endl;
		cout << "2,按照职工姓名查找：" << endl;

		int select = 0;
		cin >> select;

		if (select == 1)	
		{
			//按编号查找
			int id;
			cout << "请输入查找的编号" << endl;
			cin >> id;

			int ret = IsExist(id);
			if (ret != -1)
			{
				cout << "查找成功！该职工信息如下：" << endl;
				this->m_EmpArray[ret]->showInfo();
			}
			else
			{
				cout << "查找失败！查无此人！" << endl;
			}
		}
		else if (select == 2)
		{
			//按姓名查找
			string name;
			cout << "请输入查找的姓名" << endl;
			cin >> name;

			//加入判断是否查到的标志
			bool flag = false;		//默认未找到

			for (int i = 0; i < m_EmpNum; i++)
			{
				if (this->m_EmpArray[i]->m_Name == name)
				{
					cout << "查找成功!"<< endl<<this->m_EmpArray[i]->m_Id
						<< "号职工信息为：" << endl;

					flag = true;
					//调用显示信息接口
					this->m_EmpArray[i]->showInfo();
				}	
			}
			if (flag == false)
			{
				cout << "查找失败！查无此人！" << endl;
			}
		}
		else
		{
			cout << "输入的选项有误！" << endl;
		}
	}
	system("pause");
	system("cls");
}

//排序
void WorkerManager::Sort_Emp()
{
	if (this->m_FileIsEmpty)
	{
		cout << "文件不存在或记录为空" << endl;

		system("pause");
		system("cls");
	}
	else
	{
		cout << "请选择排序方式：" << endl;
		cout << "1,按照职工编号升序：" << endl;
		cout << "2,按照职工编号降序：" << endl;

		int select = 0;
		cin >> select;

		for (int i = 0; i < m_EmpNum; i++)
		{
			int minORmax = i;
			for (int j = i+1; j < this->m_EmpNum; j++)
			{
				if (select == 2)	//降序
				{
					if (this->m_EmpArray[minORmax]->m_Id < this->m_EmpArray[j]->m_Id)
					{
						minORmax = j;
					}
				}
				else 	//默认升序
				{
					if (this->m_EmpArray[minORmax]->m_Id > this->m_EmpArray[j]->m_Id)
					{
						minORmax = j;
					}
				}
			}

			//实现交换
			if (i != minORmax)
			{
				Worker* temp = this->m_EmpArray[i];
				this->m_EmpArray[i] = this->m_EmpArray[minORmax];
				this->m_EmpArray[minORmax] = temp;
			}
		}

		cout << "排序成功！" << endl;
		cout << "排序后的结果为：" << endl;
		this->save();
		this->Show_Emp();

	}
}

//清空文件
void WorkerManager::Clean_File()
{
	cout << "确定清空?" << endl;
	cout << "1，确定" << endl;
	cout << "2，返回" << endl;

	int select = 0;
	cin >> select;

	if (select == 1)
	{
		//清空文件
		ofstream ofs(FILENAME, ios::trunc);		//删除文件后重新创造
		ofs.close();

		if (this->m_EmpArray != NULL)
		{
			//删除堆区的每个职工对象
			for (int i = 0; i < this->m_EmpNum; i++)
			{
					delete this->m_EmpArray[i];
					this->m_EmpArray[i] = NULL;
			}

			//删除堆区数组指针
			delete[] this->m_EmpArray;
			this->m_EmpArray = NULL;
			this->m_EmpNum = 0;
			this->m_FileIsEmpty = true;
		}
		cout << "清空成功！" << endl;
	}

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

WorkerManager::~WorkerManager()
{
	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];
			}
		}
		delete[] this->m_EmpArray;
		this->m_EmpArray = NULL;
	}
}

职工管理系统.cpp

#include<iostream>
#include"WorkerManager.h"
using namespace std;
#include"worker.h"
//#include"employee.h"
//#include"manage.h"
//#include"boss.h"

int main()
{
	//测试代码
	/*Worker * worker = NULL;
	worker = new Employee(1, "张三", 1);
	worker->showInfo();
	delete worker;

	worker = new Manager(2, "李四", 2);
	worker->showInfo();
	delete worker;

	worker = new Boss(3, "王五", 3);
	worker->showInfo();
	delete worker;*/

	//实例化管理者对象
	WorkerManager wm;
	int choice = 0;
	while (true)
	{
		wm.Show_Menu();
		cout << "请输入您的选择" << 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
			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:
			system("cls");
			break;
		}
	}

	

	system("pause");
	return 0;
}