C++实战(二)——基于多态的职工管理系统完整代码

其他 2020-04-24 18:55:25 阅读次数: 0

本文转载自：https://github.com/AnkerLeng/Cpp-0-1-Resource.git
视频见：https://www.bilibili.com/video/av41559729?p=31

workerManager.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>				// 包含头文件 fstream
#define  FILENAME "empFile.txt"   //添加文件路径宏常量

class WorkerManager
{
public:

	//构造函数
	WorkerManager();
    
    //显示菜单
    void Show_Menu()
   
    //退出系统
    void exitSystem();
    
    //记录文件中的人数个数
	int m_EmpNum;
	//员工数组的指针
	Worker ** m_EmpArray;
    
    //增加职工
	void Add_Emp();
    
    //保存文件
	void save();
    
    //标志文件是否为空
	bool m_FileIsEmpty;
    
    //统计人数
	int get_EmpNum();
    
	//初始化员工
	void init_Emp();
    
	//显示职工
	void Show_Emp();

	//删除职工
	void Del_Emp();
    
    //按照职工编号判断职工是否存在,若存在返回职工在数组中位置，不存在返回-1
	int IsExist(int id);
    
    //修改职工
	void Mod_Emp();
    
    //查找职工
	void Find_Emp();
    
    //排序职工
	void Sort_Emp();
    
    //清空文件
	void Clean_File();
    
	//析构函数
	~WorkerManager();

};
workerManager.cpp
#include "workerManager.h"

WorkerManager::WorkerManager()
{
	ifstream ifs;
	ifs.open(FILENAME, ios::in);

	//1、文件不存在情况
	if (!ifs.is_open())
	{
		cout << "文件不存在" << endl; //测试输出
		this->m_EmpNum = 0;  //初始化人数
		this->m_FileIsEmpty = true; //初始化文件为空标志
		this->m_EmpArray = NULL; //初始化数组
		ifs.close(); //关闭文件
		return;
	}
    
	//2、文件存在，并且没有记录
	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;
	}
    
    //3、文件存在，且有数据
    int num =  this->get_EmpNum();
	cout << "职工个数为：" << num << endl;  //测试代码
	this->m_EmpNum = num;  //更新成员属性 
    
    //根据职工数创建数组
	this->m_EmpArray = new Worker *[this->m_EmpNum];
	//初始化职工，将文件中的数据存储到数组中
	init_Emp();

    this ->m_Fileisempty = false;
	
    //测试代码
	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;
	cout << endl;
}

void WorkerManager::exitSystem()
{
	cout << "欢迎下次使用" << endl;
	system("pause");
	exit(0);		// 退出程序
}

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

	int addNum = 0;
	cin >> addNum;

	if (addNum > 0)
	{
		//计算新空间大小
		int newSize = this->m_EmpNum + addNum;

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

		//将原空间下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];
			}
		}

		//输入新数据
		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 << "请选择该职工的岗位：" << 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: //普通员工
				worker = new Employee(id, name, 1);
				break;
			case 2: //经理
				worker = new Manager(id, name, 2);
				break;
			case 3:  //老板
				worker = new Boss(id, name, 3);
				break;
			default:
				break;
			}

			// 将创建的员工指针，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;

		//更新新的职工个数
		this->m_EmpNum = newSize;
        
        //更新职工不为空标志        
        this->m_FileIsEmpty = false;
        
		//提示信息
		cout << "成功添加" << addNum << "名新职工！" << endl;
        
        //保存到文件中
        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();
}

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)		//按行读取
	{
        //记录人数
		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;
		//根据不同的部门Id创建不同对象
		if (dId == 1)  // 1普通员工
		{
			worker = new Employee(id, name, dId);
		}
		else if (dId == 2) //2经理
		{
			worker = new Manager(id, name, dId);
		}
		else //总裁
		{
			worker = new Boss(id, name, dId);
		}
		//存放在数组中
		this->m_EmpArray[index] = worker;
		index++;
	}
}

//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 < m_EmpNum; i++)
		{
			//利用多态调用接口
			this->m_EmpArray[i]->showInfo();
		}
	}

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

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
	{
		//按职工编号删除
		cout << "请输入想要删除的职工号：" << endl;
		int id = 0;
		cin >> id;

		int index = this->IsExist(id);

		if (index != -1)  //说明index上位置数据需要删除
		{
			for (int i = index; i < this->m_EmpNum - 1; i++)
			{
				this->m_EmpArray[i] = this->m_EmpArray[i + 1];
			}
			this->m_EmpNum--;   // 更新数组中记录人员个数
            
			this->save(); //删除后数据同步到文件中
			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 << "请输入修改职工的编号：" << endl;
		int id;
		cin >> id;

		int ret = this->IsExist(id);
		if (ret != -1)
		{ 
			//查找到编号的职工

			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)
			{
			case1:
				worker = new Employee(newId, newName, dSelect);
				break;
			case2:
				worker = new Manager(newId, newName, dSelect);
				break;
			case 3:
				worker = new Boss(newId, newName, dSelect);
				break;
			default:
				break;
			}

			//更改数据 到数组中
			this->m_EmpArray[ret]= worker;
			
			cout << "修改成功！" << endl;

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

	//按任意键 清屏
	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 << "请输入查找的方式：" << endl;
		cout << "1、按职工编号查找" << endl;
		cout << "2、按姓名查找" << endl;

		int select = 0;
		cin >> select;


		if (select == 1) //按职工号查找
		{
			int id;
			cout << "请输入查找的职工编号：" << 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;

			bool flag = false;  //查找到的标志
			for (int i = 0; i < m_EmpNum; i++)
			{
				if (m_EmpArray[i]->m_Name == name)
				{
					cout << "查找成功,职工编号为："
                           << m_EmpArray[i]->m_Id
                           << " 号的信息如下：" << endl;
					
					flag = true;

					this->m_EmpArray[i]->showInfo();
				}
			}
			if (flag == false)
			{
				//查无此人
				cout << "查找失败，查无此人" << endl;
			}
		}
		else
		{
			cout << "输入选项有误" << endl;
		}
	}


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

//排序职工
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、按职工号进行升序" << endl;
		cout << "2、按职工号进行降序" << endl;

		int select = 0;
		cin >> select;


		for (int i = 0; i < m_EmpNum; i++)
		{
			int minOrMax = i;
			for (int j = i + 1; j < m_EmpNum; j++)
			{
				if (select == 1) //升序
				{
					if (m_EmpArray[minOrMax]->m_Id > m_EmpArray[j]->m_Id)
					{
						minOrMax = j;
					}
				}
				else  //降序
				{
					if (m_EmpArray[minOrMax]->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,排序后结果为：" << endl;
		this->save();
		this->Show_Emp();
	}

}

void WorkerManager::Clean_File()
{
	cout << "确认清空？" << endl;
	cout << "1、确认" << endl;
	cout << "2、返回" << endl;

	int select = 0;
	cin >> select;

	if (select == 1)
	{
		//打开模式 ios::trunc 如果存在删除文件并重新创建
		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;
            //删除堆区数组指针
			delete[] this->m_EmpArray;
			this->m_EmpArray = NULL;
			this->m_FileIsEmpty = true;
		}
		cout << "清空成功！" << endl;
	}

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

WorkerManager::~WorkerManager()
{
	if (this->m_EmpArray != NULL)
	{
		delete[] this->m_EmpArray;
	}
}
职工管理系统.cpp
#include<iostream>
using namespace std;
#include "workerManager.h"
#include "worker.h"
#include "employee.h"
#include "manager.h"
#include "boss.h"

// 测试函数，并且运行能够产生多态
void test()
{
	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;
}



int main() {

	WorkerManager wm;
	int choice = 0;
    test();						// 多态测试
    
	while (true)
	{
		//展示菜单
		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: //添加职工
            wm.Add_Emp();
			break;
		case 2: //显示职工
            wm.Show_Emp();
			break;
		case 3: //删除职工
            wm.Del_Emp();
			break;
		case 4: //修改职工
            wm.Mod_Emp();
			break;
		case 5: //查找职工
            wm.Find_Emp();
			break;
		case 6: //排序职工
            wm.Sort_Emp();
			break;
		case 7: //清空文件
            wm.Clean_File();
			break;
		default:
			system("cls");		// 清屏操作
			break;
		}
	}

	system("pause");
	return 0;
}
worker.h，员工抽象类
#pragma once
#include<iostream>
#include<string>
using namespace std;

//职工抽象基类
class Worker
{
public:

	//显示个人信息
	virtual void showInfo() = 0;
	//获取岗位名称
	virtual string getDeptName() = 0;

	int m_Id; //职工编号
	string m_Name; //职工姓名
	int m_DeptId; //职工所在部门名称编号
};
employee.h，创建普通员工类
#pragma once 
#include<iostream>
using namespace std;
#include "worker.h"

//员工类
class Employee :public Worker
{
public:

	//构造函数，初始化属性
	Employee(int id, string name, int dId);

	//显示个人信息
	virtual void showInfo();

	//获取职工岗位名称
	virtual string getDeptName();
};
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->getDeptName()
		<< " \t岗位职责：完成经理交给的任务" << endl;
}


string Employee::getDeptName()
{
	return string("员工");
}
manager.h，创建经理类
#pragma once
#include<iostream>
using namespace std;
#include "worker.h"

//经理类
class Manager :public Worker
{
public:

	Manager(int id, string name, int dId);

	//显示个人信息
	virtual void showInfo();

	//获取职工岗位名称
	virtual string getDeptName();
};
manager.cpp
#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->getDeptName()
		<< " \t岗位职责：完成老板交给的任务,并下发任务给员工" << endl;
}

string Manager::getDeptName()
{
	return string("经理");
}
boss.h，创建老板类
#pragma once
#include<iostream>
using namespace std;
#include "worker.h"

//老板类
class Boss :public Worker
{
public:

	Boss(int id, string name, int dId);

	//显示个人信息
	virtual void showInfo();

	//获取职工岗位名称
	virtual string getDeptName();
};
boss.cpp
#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->getDeptName()
		<< " \t岗位职责：管理公司所有事务" << endl;
}

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