NP84 Calculating Stock Options

Hi Guys

 

NP84 Calculating Stock Options

 

In the program Number of stock options for Manager 9000. To calculate this a code is given. I couldn’t understand this code. Anyone knows please explain.

 

numberOfOptions += (ulong)r.Next(500);

 

Thank you

 

using System;

 

namespace Employees

{

   // Employee is the base class in this hierarchy. It serves to hold data & functionality

   // common to all employee types.

   abstract public class Employee

   {

      // protected data for kids.

      protected string fullName;

      protected int empID;

      protected float currPay;

      protected string empSSN;

 

      #region Constructors

 

      public Employee() { } // Default ctor.

 

      public Employee(string FullName, int empID, float currPay, string ssn) // Custom ctor

      {

         // Assign internal state data. Note use of 'this' keyword to avoid name clashes.

         this.fullName = FullName;

         this.empID = empID;

         this.currPay = currPay;

         this.empSSN = ssn;

      }

 

      #endregion

 

      #region Methods

 

      public virtual void GiveBonus(float amount) // Bump the pay for this emp.

      { currPay += amount; }

 

      // Show state (could use ToString() as well)

      public virtual void DisplayStats()

      {

         Console.WriteLine("Name: {0}", fullName);

         Console.WriteLine("Pay: {0}", currPay);

         Console.WriteLine("ID: {0}", empID);

         Console.WriteLine("SSN: {0}", empSSN);

      }

      #endregion

   }

 

   public class Manager : Employee

   {

      private ulong numberOfOptions;

 

      #region Constructors

 

      public Manager(string FullName, int empID, float currPay, string ssn, ulong numbOfOpts)

         : base(FullName, empID, currPay, ssn)

      {

         // This point of data belongs with us!

         numberOfOptions = numbOfOpts;

      }

      #endregion

 

      #region Methods and properties

      public override void GiveBonus(float amount)

      {

         // Increase salary.

         base.GiveBonus(amount);

 

         // And give some new stock options...

         Random r = new Random();

         numberOfOptions += (ulong)r.Next(500);

      }

 

      public override void DisplayStats()

      {

         base.DisplayStats();

         Console.WriteLine("Number of stock options: {0}", numberOfOptions);

      }

      #endregion

   }

  

   public class EmpApp

   {

      public static int Main(string[] args)

      {

         Manager chucky = new Manager("Chucky", 92, 100000, "333-23-2322", 9000);

         chucky.GiveBonus(300);

         chucky.DisplayStats();

        

         return 0;

      }

   }

}

/*

Name: Chucky

Pay: 100300

ID: 92

SSN: 333-23-2322

Number of stock options: 9492

*/