为啥我这个C++程序跑不下去？

头文件：

//work.h

#pragma once
#include<iostream>
#include<string>
using namespace std;
class Work
{
public:
    virtual void showInfo() = 0;
    virtual string getDeptName() = 0;
    int m_Id;
    string m_Name;
    int m_age;
};

//boss.h

#pragma once
#include<iostream>
#include<string>
#include"work.h"
using namespace std;
class Boss :public Work  
{
public:
    Boss(int id, string name, int age);
    virtual void showInfo();
    virtual string getDeptName();
};

//employee.h

#pragma once
#include<iostream>
#include<string>
#include"work.h"
using namespace std;
class Empolyee :public Work
{
public:
    Empolyee(int id, string name, int age);
    virtual void showInfo();
    virtual string getDeptName();
};

//Manager.h

#pragma once
#include<iostream>
#include"work.h"
using namespace std;
class Manager :public Work
{
public:
    Manager(int id, string name, int age);
    virtual void showInfo();
    virtual string getDeptName();
};


//workmanager.h

#pragma once
#include<iostream>
using namespace std;
#include"work.h"
class Workmanager
{
public:
    Workmanager();
    void Show_Menu();
    void Add_Emp();
    int m_EmNum;
    Work**m_EmpArray;
    ~Workmanager();
};

源文件：

//boss.cpp
#include"boss.h"
Boss::Boss(int id, string name, int age)
{
	m_Id = id;
	m_age = age;
	m_Name = name;
}
void Boss::showInfo()
{
	cout << "职工编号 = " << this->m_Id << endl;
	cout << "职工姓名 = " << this->m_Name << endl;
	cout << "职工年龄 = " << this->m_age << endl;
	cout << "岗位 = " << this->getDeptName()<<endl;
}
string Boss::getDeptName()
{
	return string("老板");
}

//***********************
//empolyee.h
#include"empolyee.h"
Empolyee::Empolyee(int id, string name, int age)
{
	m_Id = id;
	m_age = age;
	m_Name = name;
}
void Empolyee::showInfo()
{
	cout << "职工编号 = " << this->m_Id << endl;
	cout << "职工姓名 = " << this->m_Name << endl;
	cout << "职工年龄 = " << this->m_age << endl;
	cout << "岗位 = " << this->getDeptName() << endl;
}
string Empolyee::getDeptName()
{
	return string("员工");
}

//***********************
//Manager.cpp
#include"Manager.h"
Manager::Manager(int id, string name, int age)
{
	m_Id = id;
	m_age = age;
	m_Name = name;
}
void Manager::showInfo()
{
	cout << "职工编号 = " << this->m_Id << endl;
	cout << "职工姓名 = " << this->m_Name << endl;
	cout << "职工年龄 = " << this->m_age << endl;
	cout << "岗位 = " << this->getDeptName() << endl;
}
string Manager::getDeptName()
{
	return string("经理");
}

//**************************
//Workmanager.cpp
#include"Workmanager.h"
#include"boss.h"
#include"empolyee.h"
#include"Manager.h"
Workmanager::Workmanager()
{
	this->m_EmNum=0;
	this->m_EmpArray=nullptr;
};
void Workmanager::Add_Emp()
{
	cout << "请输入添加人数" << endl;
	int addNum = 0;
	cin >> addNum;
	if (addNum > 0)
		{
			int newSize = 0;
			newSize = this->m_EmNum + addNum;
			//开辟新空间
			Work ** newSpace = new Work*[newSize];
			if (this->m_EmpArray != nullptr)
			{
				for (int i = 0; i < this->m_EmNum; i++)
				{
					newSpace[i] = this->m_EmpArray[i];
				}
				for (int j = 0; j < addNum; j++)
				{
					int Id;
					string Name;
					int age;
					cout << "请添加第" << this->m_EmNum + j << "位员工的ID" << endl;
					cin >> Id;
					cout << "请输入第" << this->m_EmNum + j << "位员工的姓名" << endl;
					cin >> Name;
					cout << "请输入第" << this->m_EmNum + j << "位员工的年龄" << endl;
					cin >> age;
					cout << "请选在添加员工岗位" << endl;
					cout << "1.boss" << endl;
					cout << "2.manager" << endl;
					cout << "3.employee" << endl;
					int select = 0;
					cin >> select;
					Work*work = nullptr;
					switch (select)
					{
					case 1:
						work = new Boss(Id, Name, age);
						break;
					case 2:
						work = new Manager(Id, Name, age);
						break;
					case 3:
						work = new Empolyee(Id, Name, age);
						break;
					default:
						break;
					}
					newSpace[this->m_EmNum + j] = work;
				}
				//删除原有空间
				delete[]this->m_EmpArray;
				//更改空间指针指向
				this->m_EmpArray = newSpace;
				//更新职工人数
				m_EmNum = newSize;
				cout << "成功添加" << addNum << "名员工" << endl;
			}
		}
	else
		{
			cout << "输入有误，请重新输入" << endl;
		}
}
Workmanager::~Workmanager()
{
};
void Workmanager::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.删除职工信息*********" << 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;
}

//**********************************
//运行文件
#include<iostream>
#include"workmanager.h"
using namespace std;
int main()
{
	Workmanager wm;
	wm.Show_Menu();
	int select = 0;
	while(1)
	{
		cin >> select;
		switch (select)
		{
		case 1:
			wm.Add_Emp();
			break;
		case 2:
			break;
		case 3:
			break;
		case 4:
			break;
		case 5:
			break;
		case 6:
			break;
		case 7:
			break;
		case 0:
		{
			cout << "欢迎下次使用" << endl;
			return 0;
		}
		}
		system("cls");
	}
	system("pause");
	return 0;
}

我现在运行这段代码，在运行下面这串代码的时候，只能运行到cin>>addNum下面的就运行不了，有没有大佬帮我解答一下问题出在哪里了。

void Workmanager::Add_Emp()
{
	cout << "请输入添加人数" << endl;
	int addNum = 0;
	cin >> addNum;
	if (addNum > 0)
		{
			int newSize = 0;
			newSize = this->m_EmNum + addNum;
			//开辟新空间
			Work ** newSpace = new Work*[newSize];
			if (this->m_EmpArray != nullptr)
			{
				for (int i = 0; i < this->m_EmNum; i++)
				{
					newSpace[i] = this->m_EmpArray[i];
				}
				for (int j = 0; j < addNum; j++)
				{
					int Id;
					string Name;
					int age;
					cout << "请添加第" << this->m_EmNum + j << "位员工的ID" << endl;
					cin >> Id;
					cout << "请输入第" << this->m_EmNum + j << "位员工的姓名" << endl;
					cin >> Name;
					cout << "请输入第" << this->m_EmNum + j << "位员工的年龄" << endl;
					cin >> age;
					cout << "请选在添加员工岗位" << endl;
					cout << "1.boss" << endl;
					cout << "2.manager" << endl;
					cout << "3.employee" << endl;
					int select = 0;
					cin >> select;
					Work*work = nullptr;
					switch (select)
					{
					case 1:
						work = new Boss(Id, Name, age);
						break;
					case 2:
						work = new Manager(Id, Name, age);
						break;
					case 3:
						work = new Empolyee(Id, Name, age);
						break;
					default:
						break;
					}
					newSpace[this->m_EmNum + j] = work;
				}
				//删除原有空间
				delete[]this->m_EmpArray;
				//更改空间指针指向
				this->m_EmpArray = newSpace;
				//更新职工人数
				m_EmNum = newSize;
				cout << "成功添加" << addNum << "名员工" << endl;
			}
		}
	else
		{
			cout << "输入有误，请重新输入" << endl;
		}
}

清空下输入缓存区看看。在cin前面加一个fflush(stdin);

cin那里要你输入一个数字，你有输入吗？