using System;

public class Student

{

    // 1. [Code] Create an auto-implementated property Name of type string 

    private string name {get; set;}

    // 2. [Code] Create an auto-implementated property Age of type int 

    private int age {get; set;}

    // 3. [Code] Create a private field _GPA of type double and a public property GPA

    //    where _GPA should never be negative.

    private double _GPA;

    public double GPA;

​

    // 4. [Code] Create the first constructor with no parameters

​

    public Student(){

        this.name = "";

        this.age = 0;

        this.GPA = 0;

        this._GPA = 0;

    }

    // 5. [Code] Create the second constructor with 3 parameters to set up the 3 properties

​

    public Student(String nam, int age, double gpa){

        this.name = nam;

        this.age = age;

        this.GPA = gpa;

        this._GPA = gpa;

    }

    // 6. [Code] Method ShowGPA

    //    Input: string strType, where "regular" or "adjusted" values are expected

    //    Output: return a double GPA value, where the return value is (GPA * 1.15) 

    //    when strType equals to "adjusted", otherwise return GPA

    //    Before you returning the GPA value, check whether GPA is greater than 4. If so, return 4.

    public double ShowGPA(String strType){

        if(strType.Equals("adjusted")){

            if((this.GPA * 1.15) > 4)

                return this.GPA * 1.15;

            return 4;

        }

        else if(strType.Equals("regular"))

            if(this.GPA > 4)

                return 4;

        return this.GPA;

    }

    // 7. [Code] Method LuckyDraw

    //    Check 

    //    Input: none

    //    Output: return a bool value whether student is lucky or not according to the rules:

    //    (1) sum up the number of characters of student's name and age.

    //    (2) return true if the number is divisible by 4; false, otherwise. (Hint: use %)

    public bool LuckyDraw(){

        int sum = this.name.Length + (int)this.GPA;

        if(sum % 4 ==0)

            return true;

        return false;

    }

}

​

public class Program

{

    // Here is a static function

    public static void Function(int i, ref double d)

    {

        Console.WriteLine("Entering CallFunction: i = {0}, d = {1}", i, d);

        i++;

        d++;

        Console.WriteLine("Exiting CallFunction: i = {0}, d = {1}", i, d);

    }

    public static void Main()

    {

        // Here are some initial values

        string strName = "Mary";

        int iAge = 18;

        double dGPA = 3.6;

        // 8. [Code] Create a student object by using the values above.

        Student st = new Student(strName, iAge, dGPA);

        // 9. [Code] Call ShowGPA("regular"), and display return value

        Console.WriteLine("Regular weighted GPA: " + st.ShowGPA("regular"));    

        // 10. [Code] Call ShowGPA("adjusted"), and display return value

        Console.WriteLine("Adjusted GPA: " + st.ShowGPA("adjusted"));

        // 11. [Code] Call LuckyDraw, and display return value

        Console.WriteLine("=================");

        /// 12. ***[Write your answer in the following comments]***

        Console.WriteLine("Age:{0}, GPA:{1}", iAge, dGPA);

        // What is the output of the code above?

        // ***Answer: Age = 18, GPA = 3.6

        Function(iAge, ref dGPA);

        // 13. ***[Write your answer in the following comments]***

        Console.WriteLine("Age:{0}, GPA:{1}", iAge, dGPA);

        // What is the output of the code above?

        // ***Answer: Age = 18, GPA = 4.6

        // Why ia one variable incremented and the other is not?

        // ***Answer: the GPA is used in Function() and the Age is not incremented. using i is not incremented but using the d value does increment. 

    }

}