Objects

class Employee
    {
        //Private Member Data
        private String _firstName;
        private String _lastName;
        private Int32 _sin;
        private Int32 _age;
        private Char _gender;
        private Int32 _yearsService;

        /*
         * Overloaded constructors: When a constructor takes multiple arguments
         *                          >in this case, the first one takes 5, and the
         *                           second one takes 6.
        */
        public Employee(String firstName, String lastName, Int32 sin, Int32 age,
            Char gender)
        {
            FirstName = firstName;
            LastName = lastName;
            Sin = sin;
            Age = age;
            Gender = gender;
            YearsService = 0;
        }

        public Employee(String firstName, String lastName, Int32 sin, Int32 age,
            Char gender, Int32 yearsService)
        {
            FirstName = firstName;
            LastName = lastName;
            Sin = sin;
            Age = age;
            Gender = gender;
            YearsService = yearsService;
        }

        /*
         * Public accessors > one per member variable
         * Returns value of private member data, or sets it
        */
        public String FirstName
        {
            get
            {
                return _firstName;
            }
            set
            {
                if (value == "")
                    throw new Exception("First name cannot be empty");
                else
                    _firstName = value;
            }
        }

        public String LastName
        {
            get
            {
                return _lastName;
            }
            set
            {
                if (value == "")
                    throw new Exception("Last name cannot be empty");
                else
                    _lastName = value;
            }
        }

        public Int32 Sin
        {
            get
            {
                return _sin;
            }
            set
            {
                if (IsValidSIN(value) == false)
                    throw new Exception("Invalid SIN");
                else
                    _sin = value;
            }
        }
        private Boolean IsValidSIN(Int32 sin)
        {
            Int32 first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, sum;
            Boolean validSIN = false;
            first = sin / 100000000;
            second = sin % 100000000 / 10000000;
            third = sin % 10000000 / 1000000;
            fourth = sin % 1000000 / 100000;
            fifth = sin % 100000 / 10000;
            sixth = sin % 10000 / 1000;
            seventh = sin % 1000 / 100;
            eighth = sin % 100 / 10;
            ninth = sin % 10;
            sum = first + second * 2 % 10 + second * 2 / 10 + third + fourth * 2 % 10 + fourth * 2 / 10 +
                    fifth + sixth * 2 % 10 + sixth * 2 / 10 + seventh + eighth * 2 % 10 + eighth * 2 / 10;
            if (sum % 10 == 0 && ninth == 0 || 10 - sum % 10 == ninth)
                validSIN = true;
            return validSIN;
        }

        public Int32 Age
        {
            get
            {
                return _age;
            }
            set
            {
                if (value <= 0)
                    throw new Exception("Age must be greater than zero");
                else
                    _age = value;
            }
        }

        public Char Gender
        {
            get
            {
                return _gender;
            }
            set
            {
                if (value != 'M' && value != 'F')
                    throw new Exception("Gender must be 'M' or 'F'");
                else
                    _gender = value;
            }
        }

        public Int32 YearsService
        {
            get
            {
                return _yearsService;
            }
            set
            {
                if (value < 0)
                    throw new Exception("Years service must be a positive number");
                else
                    _yearsService = value;
            }
        }
        public Boolean IsEligibleToRetire()
        {
            Boolean EligibleToRetire = false;
            if (_age + _yearsService >= 85)
                EligibleToRetire = true;
            return EligibleToRetire;

            //or you could write... return Age + YearsService >= 85;
            
            /* Employee e1 = new Employee("Reid", "McGee", 651864324, 22, 'M');
            Console.WriteLine("e1: " + e1.LastName + ", " + e1.FirstName + " " + e1.Sin + " " +
                e1.Age + " " + e1.Gender + " " + e1.YearsService + " " + e1.IsEligibleToRetire());
            */ 
        }
    }