using System;

//1. Create an interface IShape

public interface IShape

{

//1.1 [Code] Declare one property Name (String)

    string Name{get;set;}

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

//Input: none

//Output: double

    double CalculateArea();

}

//2. Create an interface IColor

public interface IColor

{

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

    string Color{get;set;}

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

//Input: none

//Output: bool

    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 private field and a public property for Name variable.

    //The length of name should be more than 0 (hint: use Length property of a string.)

    private string _Name;

    public string Name {

        get{ return _Name;

           }

        set {

            if (value.Length <=0)

                return;

        }

    }

    //[Code] 3.3 Create a public property for Color variable.

    //Use auto-implementation

    public string Color{get;set;}

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

    //Use auto-implementation

    public double Base {get;set;}

    public double Height {get;set;}

    //Declare base constructor (I already created for you!)

    public Triangle() { }

​

    //[Code] 3.4 Declare the second constructor with four parameters to set 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()

    {

        return (Base*Height)/2;

    }

    //[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; hint: use ToLower())

    public bool IsYellow()

    {

        bool IsYellow = true;

        if (Color.ToLower() == "yellow")

        {

            return IsYellow;

        }

        return IsYellow = false;

    }

}

​

public class Program

{

    public static void Main()

    {

        //[Code] 1. Create a triangle object

        //input: "Triangle", 8.5, 4.2, "blue" (use one line)

        Triangle triangle1 = new Triangle("Triangle",8.5,4.2,"blue");

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

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

        //Ans: 

        Console.WriteLine(triangle1.CalculateArea());

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

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

        //Ans: 

        Console.WriteLine(triangle1.IsYellow());

    }

}