C#.NET Program 23

Output:

Code:

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

namespace Question_4

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        private void button1_Click(object sender, EventArgs e)

        {

            Question_4.Book R = new Question_4.Book();

            MessageBox.Show("The Area Of Rectangle : "+ R.Area(15,25));

        }

        private void button2_Click(object sender, EventArgs e)

        {

            Question_4.Book S = new Question_4.Book();

            MessageBox.Show("The Area Of Circle : " + S.Area(18));

        }

        private void button3_Click(object sender, EventArgs e)

        {

            Question_4.Book C = new Question_4.Book();

            MessageBox.Show("The Area Of Circle :" + C.Area(18.22f));

        }

    }

}

Book Class:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace Question_4

{

   public class Book

    {

       static double pi = 3.14;

       public int Area(int Length, int Width)

       {

           return Length * Width;

       }

       public int Area(int Length)

       {

           return Length * Length;

       }

       public double Area(float radius)

       {

           return pi * radius * radius;

       }

    }

}