This short C# code will calculate the fibonacci number of an integer and display the result in a Windows GUI label.
Fibonacci Number
// a recursive fibonacci number calculator
// this is a Windows GUI program with a button, textbox and labels
// compiled with C:\Windows\Microsoft.NET\Framework\v2.0.50727\csc.exe
using System;
using System.Windows.Forms; // GUI stuff
namespace FibonacciSpace
{
public class FibonacciTesting : System.Windows.Forms.Form
{
// designer variables
private System.ComponentModel.Container components = null;
private System.Windows.Forms.Button calculateButton;
private System.Windows.Forms.TextBox inputTextBox;
private System.Windows.Forms.Label resultLabel;
private System.Windows.Forms.Label promptLabel;
public FibonacciTesting()
{
// needed for the Windows GUI
InitializeComponent();
}
// as always, clean up any resources being used
protected override void Dispose( bool disposing )
{
if ( disposing )
{
if ( components != null )
{
components.Dispose();
}
}
base.Dispose( disposing );
}
// components use in the Windows GUI
private void InitializeComponent()
{
this.inputTextBox = new System.Windows.Forms.TextBox();
this.calculateButton = new System.Windows.Forms.Button();
this.promptLabel = new System.Windows.Forms.Label();
this.resultLabel = new System.Windows.Forms.Label();
this.SuspendLayout();
//
// inputTextBox
//
this.inputTextBox.Location = new System.Drawing.Point(104, 8);
this.inputTextBox.Name = "inputTextBox";
this.inputTextBox.Size = new System.Drawing.Size(100, 20);
this.inputTextBox.TabIndex = 2;
this.inputTextBox.Text = "9";
//
// calculateButton
//
this.calculateButton.Location = new System.Drawing.Point(10, 40);
this.calculateButton.Name = "calculateButton";
this.calculateButton.Size = new System.Drawing.Size(77, 24);
this.calculateButton.TabIndex = 3;
this.calculateButton.Text = "Calculate";
this.calculateButton.Click += new System.EventHandler(this.calculateButton_Click);
//
// promptLabel
//
this.promptLabel.Location = new System.Drawing.Point(10, 8);
this.promptLabel.Name = "promptLabel";
this.promptLabel.Size = new System.Drawing.Size(90, 23);
this.promptLabel.TabIndex = 0;
this.promptLabel.Text = "Enter an integer:";
//
// resultLabel
//
this.resultLabel.Location = new System.Drawing.Point(104, 40);
this.resultLabel.Name = "resultLabel";
this.resultLabel.Size = new System.Drawing.Size(140, 40);
this.resultLabel.TabIndex = 1;
//
// the Window Form
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 15);
this.ClientSize = new System.Drawing.Size(255, 85);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.calculateButton, this.inputTextBox,
this.resultLabel, this.promptLabel});
this.BackColor = System.Drawing.Color.Wheat; // optional
this.Name = "FibonacciTesting";
this.Text = "Fibonacci Number";
this.ResumeLayout(false);
}
static void Main()
{
Application.Run( new FibonacciTesting() );
}
// call fibonacci and result result
protected void calculateButton_Click( object sender, System.EventArgs ev )
{
int num = Convert.ToInt32( inputTextBox.Text );
int fibonacciNumber = Fibonacci( num );
resultLabel.Text = "Fibonacci number is " + fibonacciNumber;
}
// calculate fibonacci number of n
public int Fibonacci( int n )
{
if ( n == 0 || n == 1 )
return n;
else
return Fibonacci( n - 1 ) + Fibonacci( n - 2 );
}
}
}
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