Thread: Why this kind of error after normal execution?

I tried to program a simple data base for employees. Everytime u wanna add a new employee, the dynamic array goes up in size and add one more empty slot for future addition.
I compiled the code and ran it, after adding 17 employees in the array and showing em on the screen, the next allocation screws up the program!!

this is the code :

Code:

#include "stdafx.h"
#include <iostream>
#include <vector>
#include <string>


using namespace std;

class Employee
{
public:
	//Default Constructor 
	Employee();
	//Constructor
	Employee(string name, int age, int salary);
	//Destructor
	~Employee();

	//Methods
	void EditInfo();
	void EditName();
	void EditAge();
	void EditSalary();

	//Accessors
	string GetName();
	int	   GetAge();
	int    GetSalary();

	//Data Members
private:
	string m_Name;
	int	   m_Age;
	int	   m_Salary;
};

//Default Constructor
Employee::Employee()
{
}

//Constructor
Employee::Employee(string name, int age, int salary): m_Name(name), m_Age(age), m_Salary(salary)
{
}

//Destructor
Employee::~Employee()
{
}

//Edititing information function 
void Employee::EditInfo()
{
	string sTemp;
	int    iTemp;

	cout << "Enter the name: "; cin >> sTemp;
	cout << endl;
	m_Name = sTemp;

	cout << "Enter the age: "; cin >> iTemp;
	cout << endl;
	m_Age = iTemp;

	cout << "Enter the salary: "; cin >> iTemp;
	m_Salary = iTemp;
}

//Accessor to m_Salary
int Employee::GetSalary()
{
	return m_Salary;
}

//Accessor to m_Age 
int Employee::GetAge()
{
	return m_Age;
}

//Accessor to m_Name
string Employee::GetName()
{
	return m_Name;
}

//Edit m_Salary
void Employee::EditSalary()
{
	int temp;
	cout << "Enter the new salary: "; cin >> temp;
	m_Salary = temp;
}

//Edit m_Age
void Employee::EditAge()
{
	int temp;
	cout << "Enter the new age: "; cin >> temp;
	m_Age = temp;
}

//Edit m_Name
void Employee::EditName()
{
	string temp;
	cout << "Enter the new name: "; cin >> temp;
	m_Name = temp;
}


void IncreaseSlots(int* NumOfEmps);
void CleanDataBase(Employee** DB, int* NumOfEmps);


int main()
{
	int NOE = 1;
	Employee** p_DB = new Employee*[NOE];
	if(!p_DB[NOE])
	{
		cout << "Error: Data Base could not be created!" << endl;
		cout << "No enough memory for allocation!" << endl;
		return 0;
	}

	bool quit = false;
	while(!quit)
	{
		cout << "What do you want to do: " << endl;
		cout << "1)Add Employee" << endl;
		cout << "2)Show Data Base" << endl;
		cout << "3)Clear Data Base" << endl;
		cout << "4)Quit the program" << endl;
		int choice;
		cin >> choice;
		cout << endl;
		switch(choice)
		{
		case 1:
			if(NOE == 1)
			{
				p_DB[NOE-1] = new Employee();
				if(!p_DB[NOE-1])
				{
					cout << "Error: no enough memory for allocation!";
					return 0;
				}
				p_DB[NOE-1]->EditName();
				cout << endl;
				IncreaseSlots(&NOE);
			}
			else
			{
				p_DB[NOE-1] = new Employee();
				if(!p_DB[NOE-1])
				{
					cout << "Error: no enough memory for allocation!";
					return 0;
				}
				p_DB[NOE-1]->EditName();
				cout << endl;
				IncreaseSlots(&NOE);	
			}
			break;

		case 2:
			for(int i = 0; i < (NOE-1); ++i)
			{
				string name = p_DB[i]->GetName();
				cout << name;
				cout << endl;
			}
			cout << NOE;
			cout << endl;
			break;

		case 3:
			
			cout << "Data Base cleared!" << endl;
			CleanDataBase(p_DB, &NOE);

		case 4:
			quit = true;
		}
	}

	CleanDataBase(p_DB, &NOE);
	
	char q;
	cin >> q;
	return 0;
}

void IncreaseSlots(int* NumOfEmps)
{
	*NumOfEmps += 1;
}

void CleanDataBase(Employee** p_DB, int *NumOfEmps)
{
	if(p_DB)
	{
		for(int i = 0; i < *(NumOfEmps); ++i)
			if(p_DB[i])
			{
				delete [] p_DB[i];
				p_DB[i] = 0;
			}
			delete p_DB;
			p_DB = 0;
	}
}

PS: What is wrong with "ClearDataBase" function??