using System;

// 1. Create an interface IShape // INTERFACE TELLS YOU WHAT A CLASS CAN DO, NO IMPLEMENTATION

    // 1.1 [Code] Declare one property Name (string) //PROPERTY --> USE GET;SET;

    // 1.2 [Code] Declare one function CalculateArea()

    //     Input: none

    //     Output: double

public interface IShape

{

    string Name {get;set;} // PROPERTIES DON'T HAVE () AFTER THE "NAME" PART. THAT IS A METHOD THING...

    double CalculateArea(); //EVEN THOUGH IT'S A FUNCTION, YOU CAN'T HAVE ANYTHING INSIDE { } --> NO IMPLEMENTATION ALLOWED, DON'T NEED TO PUT PUBLIC BEFORE TYPE

}

​

// 2. Create an interface IColor

    // 2.1 [Code] Declare one property Color (string)

    // 2.2 [Code] Declare one function IsYellow()

    //     Input: none

    //     Output: bool

public interface IColor

{

    string Color {get;set;}

    bool IsYellow();

}

​

//3. Create a class inherit from IShape and IColor

public class Triangle : IShape, IColor   //[Code] 3.1 Inherit from both Ishape and IColor

{

    // [Code] 3.2 Create a public property for Name variable and the underlying private field

    //        The length of name should be more than 0. If length is zero,

    //        issue a warning and to not change the current value.

    //        (Hint: use Length property of a string.)

    // PROPERTY = USE GET;SET;

    private string _Name; //MAKE SURE YOU HAVE THE TYPE STRING FOR BOTH _NAME AND NAME

    public string Name

    {

        get{return _Name;}

        set

        {

            //if (Name.Length == 0) //NOT CHECKING THE LENGTH OF NAME, CHECKING THE LENGTH OF THE INPUT AKA THE VALUE

            if (value.Length == 0)

                Console.WriteLine("Warning: ensure Name is more than zero characters");

            else _Name = value; 

        }

    }

    // [Code] 3.3 Create a protected property for Color property and implement it manually.

    //        Make the access modifier of the underlying field "protected" //WITH PROTECTED FIELDS YOU CAN'T AUTO-IMPLEMENT NEED TO DO IT MANUALLY  

    protected string _Color;

    public string Color

    {

        get{return _Color;}

        set

        {

            _Color = value;

        }

    }

    // INFO: protected vs private

    // A protected member is accessible within its class and by derived class instances.

    // Private members are accessible only within the body of the class or 

    // the struct in which they are declared. 

    // [Code] 3.4 Create two properties: Base (double) and Height (double)

    //        Use auto-implementation

    public double Base {get;set;}

    public double Height {get;set;}

    // Default constructor

    public Triangle() { }

​

    // [Code] 3.4 Declare the second constructor with four parameters that sets values for Name, Base, and Height, and Color

    public Triangle (string n, double b, double h, string c)

    {

        Name = n;

        Base = b;

        Height = h;

        Color = c;

    }

    // [Code] 3.5 Implement CalculateArea function

    //        Input: none

    //        Output: double

    //        Rule: Please use the formula to calculate the area for a triangle. (hint: use Base and Height).

    public double CalculateArea () //FOR FORMULAS YOU NEED TO INCLUDE THE TYPE

    {

        return 0.5*Base*Height;

    }

    // [Code] 3.6 Implement IsYellow function

    //        Input: none

    //        Output: bool

    //        Rule: if the color is yellow, return true; false, otherwise.

    //              The color string should be case insensitive

    public bool IsYellow () // IN THIS FUNCTION YOU ARE JUST CHECKING IF THE VALUE IS YELLO, BOOL RETURNS A 0 OR 1 (T/F)

    {

    return Color == "yellow"; //WE WANT TO RETURN A TRUE IF IT IS YELLOW AKA 1 AKA TRUE (WHY DOESN'T IT RETURN A YELLOW? BC THE FUNCTION RETURNS A BOOLEAN

    }

}

​

public class Program

{

    public static void Main()

    {

        // [Code] 1. Create a triangle object

        // Input: "Triangle", 8.5, 4.2, "blue" (call the appropriate constructor) 

        Triangle a = new Triangle ("Triangle", 8.5, 4.2, "blue");

        // [Question] What is the value of the area for the created triangle?

        Console.WriteLine(a.CalculateArea());

        // (Use Console.WriteLine and CalculateArea function to find the answer)

​

        // [Answer:]

        Console.WriteLine(a.IsYellow());

        // [Question] Is the triangle object's color yellow?

        // (Use Console.WriteLine and IsYellow function to find the answer)

​

        // [Answer:]

    }

}