本文已参与「新人创作礼」活动，一起开启掘金创作之路。

先看一下整体框架

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

class Boss :public Worker
{
public:
	//声明构造函数
	Boss(int id, string name, int dep);

	virtual void showInfo();
	virtual string getDeptName();
};

//manager.h
#pragma once
//普通员工
#include <iostream>
using namespace std;

#include "worker.h"

class Manager :public Worker
{
public:

	//声明构造函数
	Manager(int id, string name, int dep);

	//显示个人信息
	virtual void showInfo();

	//获取岗位名称
	virtual string getDeptName();
};

//employee.h
#pragma once
//普通员工
#include <iostream>
using namespace std;

#include "worker.h"

class Employee :public Worker
{
public:

	//声明构造函数
	Employee(int id, string name, int dep);

	//显示个人信息
	virtual void showInfo();

	//获取岗位名称
	virtual string getDeptName();
};

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

//员工抽象基类（运用多态弄出三个小类）
class Worker
{
public:

	//显示个人信息（用到多态）
	virtual void showInfo() = 0;

	//获取岗位名称
	virtual string getDeptName() = NULL;

	int p_ID;	//员工编号
	string p_Name;//员工姓名
	int p_DeptId;//员工所在部门名称编号

};

//workManager.h
#pragma once	//防止头文件重复包含
#include<iostream>	//包含输入输出流头文件
using namespace std;//使用标准命名空间

#include "worker.h"
#include "employee.h"
#include "manager.h"
#include"boss.h"

#include <fstream>
#define FILENAME "empFile.txt"

class WorkManager
{
public:

	//构造函数
	WorkManager();
	
	//展示菜单
	void showMenu();

	//退出系统功能
	void exitSystem();

	//记录员工人数
	int p_EmpNum;

	//员工数组指针
	Worker ** p_EmpArray;

	//添加员工
	void add_Emp();

	//保存文件
	void save();

	//判断文件是否为空的标志
	bool p_FileIsEmpty;

	//统计人数
	int getEmpNum();

	//初始化员工
	void init_Emp();

	//显示员工
	void show_Emp();

	//删除员工
	void del_Emp();

	//判断员工是否存在
	int isExist(int id);

	//修改员工
	void modify_Emp();

	//查找员工
	void find_Emp();

	//员工排序
	void sort_Emp();

	//清空文件
	void clean_Emp();

	//析构函数
	~WorkManager();


};

//boss.cpp
#include "boss.h"

Boss::Boss(int id, string name, int dep)
{
	this->p_ID = id;
	this->p_Name = name;
	this->p_DeptId = dep;
}

void Boss::showInfo()
{
	cout << "员工编号：" << this->p_ID
		<< "\t员工姓名：" << this->p_Name
		<< "\t员工岗位：" << this->getDeptName()
		<< "\t岗位职责：管理公司所有事情" << endl;
}

string Boss::getDeptName()
{
	return string("老板");
}

//employee.cpp
#include "employee.h"

Employee::Employee(int id, string name, int dep)
{
	this->p_ID = id;
	this->p_Name = name;
	this->p_DeptId = dep;
}

void Employee::showInfo()
{
	cout << "员工编号：" << this->p_ID
		<< "\t员工姓名：" << this->p_Name
		<< "\t员工岗位：" << this->getDeptName()
		<< "\t岗位职责：完成经理交付的任务" << endl;
}

string Employee::getDeptName()
{
	return string("普通员工");
}

//main.cpp
#include <iostream>
using namespace std;
#include "workManager.h"
#include "worker.h"
#include "employee.h"
#include "manager.h"
#include "boss.h"

int main() {
	//实例化管理者对象
	WorkManager wm;

	int choice = 0;

	while (true)
	{
		//调用展示菜单成员函数
		wm.showMenu();
		cout << "请输入你的选择：" << endl;
		cin >> choice;
		switch (choice)
		{
		case 0://退出系统
			wm.exitSystem();
			break;
		case 1://添加员工
			wm.add_Emp();
			break;
		case 2://显示员工
			wm.show_Emp();
			break;
		case 3://删除员工
			wm.del_Emp();
			break;
		case 4://修改员工
			wm.modify_Emp();
			break;
		case 5://查找员工
			wm.find_Emp();
			break;
		case 6://员工排序
			wm.sort_Emp();
			break;
		case 7://清空员工
			wm.clean_Emp();
			break;
		default:
			system("cls");//清空再回来
			break;
		}
	}
	
	system("pause");

	return 0;
}

//manager.cpp
#include "manager.h"

Manager::Manager(int id, string name, int dep)
{
	this->p_ID = id;
	this->p_Name = name;
	this->p_DeptId = dep;
}

void Manager::showInfo()
{
	cout << "员工编号：" << this->p_ID
		<< "\t员工姓名：" << this->p_Name
		<< "\t员工岗位：" << this->getDeptName()
		<< "\t岗位职责：完成老板布置的任务并下发任务给普通员工" << endl;
}

string Manager::getDeptName()
{
	return string("经理");
}

//workManager.cpp
/*
1、与用户的沟通菜单界面
2、对职工增删改查的操作
3、与文件的读写交互
*/

#include "workManager.h"


WorkManager::WorkManager()
{
	//1、文件不存在
	ifstream ifs;
	ifs.open(FILENAME, ios::in);//读文件
	
	//判断文件是否打开成功（bool类型）
	if (!ifs.is_open())
	{
		//cout << "文件不存在！" << endl;
		//初始化属性
		//初始化记录人数
		this->p_EmpNum = 0;

		//初始化数组指针为空
		this->p_EmpArray = NULL;

		//初始化文件是否为空
		this->p_FileIsEmpty = true;

		ifs.close();
		return;
	}
	//2、文件存在，但数据为空
	char ch;
	ifs >> ch;

	if (ifs.eof())
	{
		//文件为空
		//cout << "文件为空" << endl;
		//初始化属性
		//初始化记录人数
		this->p_EmpNum = 0;

		//初始化数组指针为空
		this->p_EmpArray = NULL;

		//初始化文件是否为空
		this->p_FileIsEmpty = true;

		ifs.close();
		return;
	}
	
	//3、文件存在，且有数据存在
	int num = this->getEmpNum();
	//cout << "职工人数为：" << num << endl;
	
	this->p_EmpNum = num;

	//开辟空间
	this->p_EmpArray = new Worker*[this->p_EmpNum];

	this->init_Emp();//初始化，将文件中的数据存到数组中

}

void WorkManager::showMenu()
{
	cout << "***** 猪场员工管理系统 *****" << endl;
	cout << "***** 0、退出管理程序  *****" << endl;
	cout << "***** 1、添加员工信息  *****" << endl;
	cout << "***** 2、显示员工信息  *****" << endl;
	cout << "***** 3、删除员工信息  *****" << endl;
	cout << "***** 4、修改员工信息  *****" << endl;
	cout << "***** 5、查找员工信息  *****" << endl;
	cout << "***** 6、按照编号排序  *****" << endl;
	cout << "***** 7、清空所有文档  *****" << endl;
	cout << endl;
}

//退出系统
void WorkManager::exitSystem()
{
	cout << "欢迎您下次使用！" << endl;
	
	system("pause");
	exit(0);//退出程序
}
//添加员工
void WorkManager::add_Emp()
{
	cout << "请输入你要添加的员工数量：" << endl;

	int addNum = 0;//保存用户的输入数量
	cin >> addNum;

	if (addNum > 0)
	{
		//添加
		//计算添加新空间大小
		int newSize = this->p_EmpNum + addNum;//新空间大小 = 原纪录人数+新增人数

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

		//将原空间下的数据拷贝到新空间下
		//判断
		if (this->p_EmpArray != NULL) {
			for (int i = 0; i < this->p_EmpNum; i++) {
				newSpace[i] = this->p_EmpArray[i];
			}
		}
		//批量添加新数据
		for (int i = 0; i < addNum; i++)
		{
			int id;
			string name;
			int dep;

			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 << "请输入新职工岗位：" << endl;
			cout << "1、普通员工" << endl;
			cout << "2、产品经理" << endl;
			cout << "3、老板" << endl;
			cin >> dep;

			Worker * worker = NULL;
			switch (dep)
			{
			case 1://普通员工
				worker = new Employee(id, name, 1);
				break;
			case 2://产品经理
				worker = new Manager(id, name, 1);
				break;
			case 3://老板
				worker = new Boss(id, name, 3);
				break;
			default:
				break;
			}
			//将创建职工职责保存到数组中
			newSpace[this->p_EmpNum + i] = worker;
		}
		//释放原有空间
		delete[] this->p_EmpArray;

		//更改新空间指向
		this->p_EmpArray = newSpace;

		//更新新的职工人数
		this->p_EmpNum = newSize;

		//更新职工不为空的标志
		this->p_FileIsEmpty = false;

		//提示添加成功
		cout << "成功添加 " << addNum << "名新职工！" << endl;

		//添加成功后，保存文件
		this->save();
	}
	else
	{
		cout << "输入有误，请重新输入！" << endl;
	}
		
	system("pause");
	system("cls");
		
	
	
}

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

	//循环遍历保存文件
	for (int  i = 0; i < this->p_EmpNum; i++)
	{
		ofs << this->p_EmpArray[i]->p_ID 
			<< "\t"<< this->p_EmpArray[i]->p_Name 
			<< "\t"<< this->p_EmpArray[i]->p_DeptId << endl;
		

	}
	ofs.close();//关闭文件
}

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

	int id;
	string name;
	int dep;
	int num = 0;

	while (ifs >> id && ifs >> name && ifs >> dep)
	{
		//记录人数
		num++;
	}
	ifs.close();

	return num;
}

void WorkManager::init_Emp()
{
	ifstream ifs;
	ifs.open(FILENAME, ios::in);

	int id;
	string name;
	int dep;
	int index = 0;

	while (ifs >> id && ifs >> name && ifs >> dep)
	{
		Worker * worker = NULL;

		if (dep == 1)//普通员工
		{
			worker = new Employee(id, name, dep);
		}
		else if (dep == 2)
		{
			worker = new Manager(id, name, dep);
		}
		else
		{
			worker = new Boss(id, name, dep);
		}
		this->p_EmpArray[index] = worker;
		index++;
	}
	//关闭文件
	ifs.close();

}

void WorkManager::show_Emp()
{
	if (this->p_FileIsEmpty)
	{
		cout << "文件不存在或记录为空" << endl;
	}
	else
	{
		for (int i = 0; i < p_EmpNum; i++)
		{
			//利用多态调用接口
			this->p_EmpArray[i]->showInfo();

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

}

void WorkManager::del_Emp()
{
	if (this->p_FileIsEmpty)
	{
		cout << "文件不存在或记录为空！" << endl;
	}
	else
	{
		//按照员工的编号来删除员工
		cout << "请输入想要删除的员工编号：" << endl;
		int id = 0;
		cin >> id;

		int index = this->isExist(id);

		if (index != -1)//说明员工存在，并且要删除掉index位置上的员工
		{
			//数据前移
			for (int i = index; i < this->p_EmpNum-1; i++)
			{
				this->p_EmpArray[i] = this->p_EmpArray[i + 1];
			}
			this->p_EmpNum--;//更新数组中记录人员的个数
			
			//同步更新到文件中
			this->save();

			cout << "删除成功！" << endl;
		}
		else
		{
			cout << "删除失败，未找到此员工！" << endl;
		}
	}
	system("pause");
	system("cls");

}

int WorkManager::isExist(int id)
{
	int index = -1;

	for (int i = 0; i < p_EmpNum; i++)
	{
		if (this->p_EmpArray[i]->p_ID == id)
		{
			index = i;
			
			break;
		}
	}
	return index;
}

//修改员工
void WorkManager::modify_Emp()
{
	if (this->p_FileIsEmpty)
	{
		cout << "文件不存在或记录为空！" << endl;
	}
	else
	{
		cout << "请输入你要修改的员工编号：" << endl;
		int id = 0;
		cin >> id;

		int num = this->isExist(id);
		if (num != -1)
		{
			//查到该员工的编号
			delete this->p_EmpArray[num];

			int newID = 0;
			string newName = "";
			int depSelect = 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 << "请输入新岗位：" << endl;
			cout << "1、普通员工" << endl;
			cout << "2、产品经理" << endl;
			cout << "3、老板" << endl;
			cin >> depSelect;

			Worker * worker = NULL;
			switch (depSelect)
			{
			case 1:
				worker = new Employee(newID, newName, depSelect);
				break;
			case 2:
				worker = new Manager(newID, newName, depSelect);
				break;
			case 3:
				worker = new Boss(newID, newName, depSelect);
				break;
			default:
				break;
			}
			//更改数据到数组中
			this->p_EmpArray[num] = worker;

			cout << "修改成功！" << this->p_EmpArray[num]->p_DeptId << endl;

			//保存到文件中
			this->save();
		}
		else
		{
			cout << "查无此人，修改失败！" << endl;
		}
	}

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

}

void WorkManager::find_Emp()
{
	if (this->p_FileIsEmpty)
	{
		cout << "文件不存在或记录为空！" << endl;
	}
	else
	{
		cout << "请输入查找的方式：" << endl;
		cout << "1、按照员工编号查找" << endl;
		cout << "2、按照员工姓名查找" << endl;

		int choice = 0;
		cin >> choice;

		if (choice == 1) {
			int id;
			cout << "请输入你要查找的员工编号：" << endl;
			cin >> id;

			int num = isExist(id);

			if (num != -1) {
				cout << "查到成功，此员工信息如下：" << endl;
				this->p_EmpArray[num]->showInfo();
			}
			else
			{
				cout << "查找失败，没有此员工的信息！" << endl;
			}
		}
		
		if (choice == 2) {
			string name;
			cout << "请输入你要查找的员工姓名：" << endl;
			cin >> name;

			bool flag = false;
			for (int i = 0; i < p_EmpNum; i++) {
				if (p_EmpArray[i]->p_Name == name) {
					cout << "查到成功，此员工编号为："
						<< p_EmpArray[i]->p_ID
						<< "信息如下：" << endl;
					flag = true;
					this->p_EmpArray[i]->showInfo();
				}
			}
			if (flag == false) {
				//查无此人
				cout << "查找失败，没有此员工的信息！" << endl;
			}
			
		}
		else
		{
			cout << "输入选项有误！" << endl;
		}
	}
	system("pause");
	system("cls");

}

void WorkManager::sort_Emp()
{
	if (this->p_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、按照员工号进行升序排列" << endl;
		cout << "2、按照员工号进行降序排列" << endl;

		int select = 0;
		cin >> select;

		for (int i = 0; i < p_EmpNum; i++)
		{
			int minOrMax = i;
			for (int j = i + 1; j < p_EmpNum; j++)
			{
				if (select == 1)//升序排列
				{
					if (p_EmpArray[minOrMax]->p_ID > p_EmpArray[j]->p_ID)
					{
						minOrMax = j;
					}
				}
				else//降序排列
				{
					if (p_EmpArray[minOrMax]->p_ID < p_EmpArray[j]->p_ID)
					{
						minOrMax = j;
					}
				}
			}
			if (i != minOrMax)
			{
				Worker * temp = p_EmpArray[i];
				p_EmpArray[i] = p_EmpArray[minOrMax];
				p_EmpArray[minOrMax] = temp;
			}
		}

		cout << "排序成功后，排序结果为：" << endl;
		this->save();
		this->show_Emp();
	}

}

//清空文件
void WorkManager::clean_Emp()
{
	cout << "是否确认清空？" << endl;
	cout << "1、确认" << endl;
	cout << "2、返回" << endl;

	int select = 0;
	cin >> select;

	if (select == 1)
	{
		//如果存在，则删除文件并重新创建
		ofstream ofs(FILENAME, ios::trunc);
		ofs.close();

		if (this->p_EmpArray != NULL)
		{
			for (int i = 0; i < this->p_EmpNum; i++)
			{
				if (this->p_EmpArray[i] != NULL)
				{
					delete this->p_EmpArray[i];
				}
			}
			this->p_EmpNum = 0;
			delete[] this->p_EmpArray;
			this->p_EmpArray = NULL;
			this->p_FileIsEmpty = true;
		}
		cout << "清空成功！" << endl;
	}
	system("pause");
	system("cls");

}

WorkManager::~WorkManager()
{	//释放堆区数据
	if (this->p_EmpArray != NULL)
	{
		delete[] this->p_EmpArray;
		this->p_EmpArray = NULL;
	}
}

emmm，所有的代码就在上面了，需要的自取，这代码我试运行了几次，没有出现什么漏洞，应该能对你们有帮助