Question

The requirements for this program are as follows:

1. Create a header file named “Employee.h”. Inside this header file, declare an Employee class with the following features:

   • Private members

     • a std::string for the employee’s first name

     • a std::string for the employee’s last name

     • an unsigned int for the employee’s identification number

     • a std::string for the city in which the employee works

   • Public members

     • A constructor that takes no arguments

     • A constructor that takes two arguments, representing:

       • the employee’s first name
       • the employee’s last name

     • A constructor that takes three arguments, representing:

       • the employee’s first name
       • the employee’s last name
       • the employee’s identification number

     • A constructor that takes four arguments, representing:

       • the employee’s first name
       • the employee’s last name
       • the employee’s identification number
       • the employee’s city

     • A method named displayDetails() that takes no parameters, returns void, and is marked as const.

2. Create a source code file named “Employee.cpp” that contains the implementations of the methods described above. Specifically:

   • The displayDetails() method should display to the screen all of the information contained in the employee’s private data members.

   • All constructors should use constructor initializers to set the employee’s string data members. If a particular string is unknown (i.e., it’s not being passed into that constructor), set it to “unknown”.

   • For the two constructors that do not accept an argument for the identification number, use constructor initializers to set the identification number to 0.

   • For the two constructors that accept an argument for the identification number, do not use a constructor initializer to set the identification number. Instead, perform basic validity checking inside the body of the constructor as follows: if the passed-in value is less than 10000000, use the passed-in value to set the employee’s identification number. Otherwise, the identification number should be set to 0. (In other words, we will only allow identification numbers that are at most seven digits long).

Finally, write a simple driver file with a main() function. (An example is provided below; you may use this code but I'd recommend creating your own, for the sake of practice.) Inside main(), create at least six Employee objects by invoking the four different constructors. These objects should invoke the four different constructors and test the validity-checking of the identification number (so there will be two objects that invoke the three-argument constructor -- one of them should pass an invalid identification number, and the other should pass a valid number... followed by the same procedure for the four-argument constructor). For each object, invoke the displayDetails() method to test your program.

Example driver and output from that driver:

//inside Source.cpp

#include <iostream>
#include "Employee.h"

using namespace std;

int main()
{
   Employee a;
   Employee b{ "Robert", "Childan" };
   Employee c{ "Nobusuke", "Tagomi", 83179391 };
   Employee d{ "Ed", "McCarthy", 1 };
   Employee e{ "Frank", "Frink", 73641933, "San Francisco" };
   Employee f{ "Juliana", "Frink", 2, "Canon City" };

   a.displayDetails();
   b.displayDetails();
   c.displayDetails();
   d.displayDetails();
   e.displayDetails();
   f.displayDetails();
}

//output from above driver

Employee Details:
First name: unknown
Last name: unknown
ID: 0
Office location: unknown

Employee Details:
First name: Robert
Last name: Childan
ID: 0
Office location: unknown

Employee Details:
First name: Nobusuke
Last name: Tagomi
ID: 0
Office location: unknown

Employee Details:
First name: Ed
Last name: McCarthy
ID: 1
Office location: unknown

Employee Details:
First name: Frank
Last name: Frink
ID: 0
Office location: San Francisco

Employee Details:
First name: Juliana
Last name: Frink
ID: 2
Office location: Canon City

///////////////////////////

Language: C++

Please ask questions if inftructions are unclear

Answer 1

The relevant comments have been added

This is what the header file will look like:

//header file
//Employee.h

#ifndef EMPLOYEE_H

#define EMPLOYEE_H

#include <string>

using namespace std;

class Employee

{

    private:

        string first_name;

        string last_name;

        unsigned int employee_id;

        string loaction;

    public :

        //Default Constructor

        Employee();

        //Constructor with two arguments

        Employee(const string firstName, const string lastName);

        //Constructor with three arguments

        Employee(const string firstName, const string lastName, unsigned int id);

        //Constructor with four arguments

        Employee(const string firstName, const string lastName, unsigned int id, const string city);

        // Print a description of object

        void  displayDetails() const;

};

#endif

---------------------------------------------------------------------------

// Implementation File for the Employee class

#include <iostream>

#include "Employee.h"

using namespace std;

// Employee constructor

Employee::Employee()

{

    first_name="unknown";

    last_name="unknown";

    employee_id=0;

    location="unknown";

}

//Constructor with two arguments

Employee::Employee(string firstName,string lastName)

{

    first_name=firstName;

    last_name=lastName;

    employee_id=0;

    location="unknown";

}

//Constructor with three arguments  

Employee::Employee(string firstName,string lastName, unsigned int id){

    first_name=firstName;

    last_name=lastName;

    if(id<100000000)

        employee_id=id;

    else

        employee_id=0;

    //shorter format

    // employee_id=(id<100000000)?id:0;

    location="unknown";

}

//Constructor with four arguments

Employee::Employee(string firstName,string lastName, unsigned int id,string city){

    first_name=firstName;

    last_name=lastName;

    if(id<100000000)

        employee_id=id;

    else

        employee_id=0;

    location=city;

}

// Employee member function

void Employee :: displayDetails() const

{

    cout<<"Employee Details:"<<endl;

    cout<<"First Name: "<<first_name<<endl;

    cout<<"Last Name: "<<last_name<<endl;

    cout<<"ID: "<<employee_id<<endl;

    cout<<"Office location: "<<location<<endl;

}