My instructor at my engineering institute has given the following assignment question:

Create a database of scientists and labourers and maintain the same by making use of inheritance.

We haven't been taught the database connectivity with program execution, so that's not to be used. I wrote the following code:

#include<iostream.h>
class employee
{
	char name[20];
	long id;
	int age;
	char gender;
	char address[30];
	char phone[3][10];
public:
	employee();
	virtual void accept();
	virtual void display();
		
};
employee::employee()
{
	name[0]='\0';
	id=0;
	age=0;
	gender='\0';
	address[0]='\0';
	for(int i=0;i<3;i++)
		phone[i][0]='\0';
}
void employee::display()
{
	cout<<endl<<"name:"<<name;
	cout<<endl<<"id:"<<id;
	cout<<endl<<"age:"<<age;
	cout<<endl<<"gender:"<<gender;
	cout<<endl<<"address:"<<address;
	cout<<endl<<"phone number:";
	for(int i=0;i<3;i++)
	{
		if(phone[i]=='\0')
		{
			break;
		}
		cout<<endl<<"phone "<<i+1<<" : "<<phone[i];
	}
}
void employee::accept()
{
	int phone_count;
	cout<<endl<<"enter the name:";
	cin>>name;
	cout<<endl<<"enter the id:";
	cin>>id;
	cout<<endl<<"enter the age:";
	cin>>age;
	cout<<endl<<"enter the gender:";
	cin>>gender;
	cout<<endl<<"enter the address:";
	cin.getline(address,29);
	cout<<endl<<"enter the number of phone number:";
	cin>>phone_count;
	for(int i=0;i<phone_count;i++)
	{
		cout<<endl<<"phone "<<i<<" : ";
		cin>>phone[i];
	}
}
//-----------------------------------------------------------------
class scientist:public employee
{
	char qual[30];
	char field[20];
	int exp;
public:
	scientist()
	{
		qual[0]='\0';
		field[0]='\0';
		exp=0;
	}
	void accept();
	void display();
	
};
void scientist::accept()
{
	employee::accept();
	cout<<endl<<"enter the qualification:";
    cin.getline(qual,29);		
	cout<<endl<<"enter the field:";
	cin.getline(field,19);
	cout<<endl<<"enter the experience:";
	cin>>exp;
}
void scientist::display()
{
	employee::display();
	cout<<endl<<"Qualification : "<<qual;
	cout<<endl<<"Field         : "<<qual;
	cout<<endl<<"Experience    : "<<qual;
}
//-----------------------------------------------------------------
class labourer:public employee
{
	char job[10];
	int hours;
	double pay;
public:
	labourer()
	{
		job[0]='\0';
		hours=0;
		pay=0;
	}
	void accept();
	void display();
	
};
void labourer::accept()
{
	employee::accept();
	cout<<endl<<"enter the job:";
    cin.getline(job,9);		
	cout<<endl<<"enter the hours:";
	cin>>hours;
	cout<<endl<<"enter the pay:";
	cin>>pay;
}
void labourer::display()
{
	employee::display();
	cout<<endl<<"Job    : "<<job;
	cout<<endl<<"Hours  : "<<hours;
	cout<<endl<<"Pay    : "<<pay;
}
//-----------------------------------------------------------------
int main()
{
	employee *p;
	cout<<endl<<"enter 1 for scinetisi , 2 for labourer :";
int i;
	cin>>i;
	if(i==1)
	{
		p=new scientist;
	}
	else if(i==2)
	{
		p=new labourer;
	}
	p->accept();
	p->display();

		cout<<endl;
	return 0;
}

In my code I have used inheritance and it stores and displays details of scientist and labourer, but still it isn't a database as it stores only one record that too of either of the two entities. Any suggestions to my problem?

Looks like you need to add code that will read/write employee information to/from a file (database). You need a menu in the main() function something like

1.  Read an employee record
2.  Create a new employee record
3.  Write the employee record
4.  List all employee names
5.  Quit

Then write functions that implement each of the above menu items using the classes that you wrote.

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