using System;

​

public class Employee

{

    // 1. [Code] Create a private field (string _name) and a public property (Name)

    private string _name;

    public string Name

    {

        get { return _name; }

        set { _name = value; }

    }

    // 2. [Code] (double) Create a private field (double _yearlysalary) and a public properties (YearlySalary)

    // Rule: yearly salary should not be negative. If the value is negative, set default value as 36000, writeline a warning.

    private double _yearlySalary = 36000;

    public double YearlySalary

    {

        get { return _yearlySalary; }

        set

        {

            if (value < 0)

            {

                Console.WriteLine("Warning: Yearly salary should not be negative. Setting default value as 36000.");

                _yearlySalary = 36000;

            }

            else

            {

                _yearlySalary = value;

            }

        }

    }

    // Constructor

    public Employee()

    {

    }

    // 3. [Code] Write a function: CalculateSalary with one string parameter

    // Input Parameter: string strType, will be one of the 3 string values ("month", "quarter", "year")

    // Output: return a double value 

    // if strType equals to "month", return monthly salary (monthly salary = yearly salary / 12)

    // if strType equals to "quarter", return quarterly salary (quarterly salary = yearly salary / 4)

    // if strType equals to "year", return yearly salary

    public double CalculateSalary(string strType)

    {

        if(strType == "month")

        {

            return YearlySalary / 12;

        }

        else if (strType == "quarter")

        {

            return YearlySalary / 4;

        }

        else if (strType == "year")

        {

            return YearlySalary;

        }

        else

        {

            throw new ArgumentException("Error: strType must equal 'month', 'quarter', or 'year'.");

        }

    }

    // 4. [Code] Write a function: IsEmployeeManager

    // Check whether the employee is a manager or not

    // Input: no

    // Output: return a boolean

    // if employee's salary is greater than 50000, return true; false, otherwise.

    public bool IsEmployeeManager()

    {

        return YearlySalary > 50000;

    }

    // 5. [Code] Write a function: GetFirstThreeLetters

    // Get first three letters from employee's name

    // Input: no

    // Output: return a string

    // Hint: use substring()

    public string GetFirstThreeLetters()

    {

        if (Name.Length < 3)

        {

            return Name;

        }

        else

        {

            return Name.Substring(0, 3);

        }

    }

}

public class Program

{

    public static void Main()

    {

        // 6. [Code] Create an Employee object

        // Nane (John); YearlySalary (75000)

        Employee emp = new Employee();

        emp.Name = "John";

        emp.YearlySalary = 75000;

        // 7. [Code] Call object's functions

        // Call GetFirstThreeLetter() function and print out the information.

        Console.WriteLine("First three letters of employee name: " + emp.GetFirstThreeLetters());

        // Call IsEmployeeManager() function and print out the information.

        Console.WriteLine("Is employee a manager? " + emp.IsEmployeeManager());

        // Call CalculateSalary("month") function and print out the information.

        Console.WriteLine("Monthly salary: " + emp.CalculateSalary("month"));

        // Call CalculateSalary("quarter") function and print out the information.

        Console.WriteLine("Quarterly salary: " + emp.CalculateSalary("quarter"));

        // Call CalculateSalary("year") function and print out the information.

        Console.WriteLine("Yearly salary: " + emp.CalculateSalary("year"));

    }

}