Question

c# language

Description: Design and implement a C# application that allows the user to enter a number N. It returns to the user the result of the Fibonacci of N. The Fibonacci of a number N is calculated as follows: Fibonacci (0) 0 Fibonacci (1) - Fibonacci (n) - Fibonacci (n-1) + Fibonacci (n-2) Requirements Your Application should have the following: • An exception class called FibException that is thrown when the user enters a negative value of N • A class called Fib contain an integer N, and a method called CalcFib that takes in the integer N and returns the Fibonacci of N. It throws FibException if N O. This method is a recursive method that uses the above definitions to calculate the Fibonacci of N. • Apply the concept of inheritance on the previous class Fib. The derived class should have a method CalcFib that takes in the integer N and returns the Fibonacci of N Without Recursion) User Interface Create a simple user interface such as the following: Enter an integer: 1 Fibonacci ofis 0 Your user interface has to handle the following cases: 1. When the user enters text that cannot be parsed into an integer. Your program should display the following: Enter a valid number! 2. When the user enters a negative number, your program should display the following: FbException: Fibonacci number cannot be negative ok

Answer 1

C Sharp Application:

File: Form1.Designer.cs

namespace Fibonacii
{
partial class Form1
{
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.IContainer components = null;

/// <summary>
/// Clean up any resources being used.
/// </summary>
/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}

#region Windows Form Designer generated code

/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.label1 = new System.Windows.Forms.Label();
this.tbNumber = new System.Windows.Forms.TextBox();
this.lblResult = new System.Windows.Forms.Label();
this.btnCalculate = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// label1
//
this.label1.AutoSize = true;
this.label1.Location = new System.Drawing.Point(12, 25);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(89, 13);
this.label1.TabIndex = 0;
this.label1.Text = "Enter an Integer: ";
//
// tbNumber
//
this.tbNumber.Location = new System.Drawing.Point(110, 22);
this.tbNumber.Name = "tbNumber";
this.tbNumber.Size = new System.Drawing.Size(118, 20);
this.tbNumber.TabIndex = 1;
//
// lblResult
//
this.lblResult.AutoSize = true;
this.lblResult.Font = new System.Drawing.Font("Microsoft Sans Serif", 9.75F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.lblResult.Location = new System.Drawing.Point(28, 62);
this.lblResult.Name = "lblResult";
this.lblResult.Size = new System.Drawing.Size(0, 16);
this.lblResult.TabIndex = 2;
//
// btnCalculate
//
this.btnCalculate.Location = new System.Drawing.Point(251, 20);
this.btnCalculate.Name = "btnCalculate";
this.btnCalculate.Size = new System.Drawing.Size(75, 23);
this.btnCalculate.TabIndex = 3;
this.btnCalculate.Text = "Calculate";
this.btnCalculate.UseVisualStyleBackColor = true;
this.btnCalculate.Click += new System.EventHandler(this.btnCalculate_Click);
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(338, 113);
this.Controls.Add(this.btnCalculate);
this.Controls.Add(this.lblResult);
this.Controls.Add(this.tbNumber);
this.Controls.Add(this.label1);
this.Name = "Form1";
this.Text = "Fibonacci";
this.ResumeLayout(false);
this.PerformLayout();

}

#endregion

private System.Windows.Forms.Label label1;
private System.Windows.Forms.TextBox tbNumber;
private System.Windows.Forms.Label lblResult;
private System.Windows.Forms.Button btnCalculate;
}
}

File: Form1.cs

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 Fibonacii
{
public partial class Form1 : Form
{
//Exception class
class FibException : Exception
{
public FibException()
: base(String.Format("FibException: Fibonacci number cannot be negative")) { }
}

//Class that calculates Fibonacci number recursively
class FibRecursive
{
//Method that calculates the value
public int CalcFib(int n)
{
//Finding fibonacci
if (n < 0)
throw new FibException();

//Base cases
if (n == 0)
return 0;
else if (n == 1)
return 1;
else
return CalcFib(n - 1) + CalcFib(n - 2);
}
}

//Derived class
class FibIterative : FibRecursive
{
//Method that calculates the value
public int CalcFib(int n)
{
//Finding fibonacci
if (n < 0)
throw new FibException();

//Base cases
if (n == 0)
return 0;
else if (n == 1)
return 1;
else
{
int a = 0, b = 1, c=0;

for (int i = 2; i <= n; i++)
{
//Calcalating value
c = a + b;
  
//Swapping
a = b;
b = c;
}

return c;
}
}
}
  
public Form1()
{
InitializeComponent();
}

//Calculate button click event
private void btnCalculate_Click(object sender, EventArgs e)
{
try
{
//Getting value
int n = Convert.ToInt32(tbNumber.Text);

//Calculating result
FibRecursive fObj = new FibRecursive();
int result = fObj.CalcFib(n);

//Writing result to lable
lblResult.Text = "Fibonacci of " + n.ToString() + " is " + result.ToString();
}
catch (FibException ex)
{
MessageBox.Show(ex.Message);
}
catch (Exception ex)
{
MessageBox.Show("Enter a valid number!!");
}
}
}
}

_______________________________________________________________________________________________________________________

Sample Run: