I could not resist to put this little utility into a GUI dress. The code shows you that the C# StringBuilder is nicely suited to create the binary string. Also included is a check to assure that the input is an all digit numeric string.
Decimal Number to Binary String
// give the binary representation of a decimal number
// uses a Windows GUI with Form, Label, TextBox, and Button components
using System;
using System.Windows.Forms; // GUI things
using System.Text; // StringBuilder
namespace WindowsApplicationDec2Bin
{
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.Label label1;
private System.Windows.Forms.TextBox textBox1;
private System.Windows.Forms.Button button1;
private System.Windows.Forms.Label label2;
private System.Windows.Forms.TextBox textBox2;
private System.ComponentModel.Container components = null;
public Form1()
{
InitializeComponent();
}
protected override void Dispose( bool disposing )
{
if ( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region Windows Form Designer generated code
private void InitializeComponent()
{
this.label1 = new System.Windows.Forms.Label();
this.textBox1 = new System.Windows.Forms.TextBox();
this.button1 = new System.Windows.Forms.Button();
this.label2 = new System.Windows.Forms.Label();
this.textBox2 = new System.Windows.Forms.TextBox();
this.SuspendLayout();
//
// label1
//
this.label1.BackColor = System.Drawing.Color.Bisque;
this.label1.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
this.label1.Location = new System.Drawing.Point(16, 16);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(120, 16);
this.label1.TabIndex = 0;
this.label1.Text = "Enter integer number:";
//
// textBox1
//
this.textBox1.BackColor = System.Drawing.Color.Yellow;
this.textBox1.Location = new System.Drawing.Point(152, 16);
this.textBox1.Name = "textBox1";
this.textBox1.Size = new System.Drawing.Size(120, 20);
this.textBox1.TabIndex = 1;
this.textBox1.Text = "1";
//
// button1
//
this.button1.BackColor = System.Drawing.Color.Silver; //PeachPuff;
this.button1.Location = new System.Drawing.Point(16, 48);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(256, 23);
this.button1.TabIndex = 2;
this.button1.Text = "Press to calculate binary number";
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// label2
//
this.label2.BackColor = System.Drawing.Color.Bisque;
this.label2.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
this.label2.Location = new System.Drawing.Point(16, 88);
this.label2.Name = "label2";
this.label2.Size = new System.Drawing.Size(104, 16);
this.label2.TabIndex = 3;
this.label2.Text = "The binary result:";
//
// textBox2
//
this.textBox2.BackColor = System.Drawing.Color.PaleGreen;
this.textBox2.Location = new System.Drawing.Point(16, 118);
this.textBox2.Name = "textBox2";
this.textBox2.Size = new System.Drawing.Size(232, 20);
this.textBox2.TabIndex = 4;
this.textBox2.Text = "";
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.BackColor = System.Drawing.Color.DarkGreen;
this.ClientSize = new System.Drawing.Size(284, 162);
this.Controls.Add(this.textBox2);
this.Controls.Add(this.label2);
this.Controls.Add(this.button1);
this.Controls.Add(this.textBox1);
this.Controls.Add(this.label1);
this.Name = "Form1";
this.Text = "Decimal to Binary";
this.ResumeLayout(false);
}
#endregion
static void Main()
{
Application.Run(new Form1());
}
// return true if all of the characters in the string are digits
public static bool IsAllDigits(string sRaw)
{
string s = sRaw.Trim();
if (s.Length == 0)
{
return false;
}
for(int index = 0; index < s.Length; index++)
{
if (Char.IsDigit(s[index]) == false)
{
return false;
}
}
return true;
}
private void button1_Click(object sender, System.EventArgs e)
{
StringBuilder sb1 = new StringBuilder();
string s;
int deci = 0;
int remain;
// check if entry has all digits
s = this.textBox1.Text;
if (IsAllDigits(s))
deci = Int32.Parse(s);
else
{
this.textBox1.Text += " Integer only!";
this.textBox1.Focus();
}
// build the binary string
if (deci > 0)
{
do
{
remain = deci % 2;
deci = deci / 2;
sb1.Insert(0, remain);
} while(deci > 0);
}
this.textBox2.Text = sb1.ToString();
}
}
}
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