C#實現十進制數轉換為二進制、八進制、十六進制數的算法

using System;  
using System.Collections.Generic;  
using System.ComponentModel;  
using System.Data;  
using System.Drawing;  
using System.Text;  
using System.Windows.Forms;  
 
namespace ExDtoB  
{  
    public partial class Form1 : Form  
    {  
        public Form1()  
        {  
            InitializeComponent();  
        }  
 
        //十進制轉二制  
        public string DtoB(int d)  
        {  
            string b = "";  
            //判斷該數如果小於2，則直接輸出  
            if (d < 2)  
            {  
                b = d.ToString();  
            }  
            else 
            {  
                int c;  
                int s = 0;  
                int n = d;  
                while (n >= 2)  
                {  
                    s++;  
                    n = n / 2;  
                }  
                int[] m = new int[s];  
                int i = 0;  
                do 
                {  
                    c = d / 2;  
                    m[i++] = d % 2;  
                    d = c;  
                } while (c >= 2);  
                b = d.ToString();  
                for (int j = m.Length - 1; j >=0; j--)  
                {  
                    b += m[j].ToString ();  
                }  
            }  
            return b;  
        }  
 
        //十進制轉八進制---www.bianceng.cn
        public string DtoO(int d)  
        {  
            string o = "";  
            if (d < 8)  
            {  
                o = d.ToString();  
            }  
            else 
            {  
                int c;  
                  
                int s=0;  
                int n=d;  
                int temp = d;  
                while (n >= 8)  
                {  
                    s++;  
                    n = n / 8;  
                }  
                int[] m = new int[s];  
                int i = 0;  
                do 
                {  
                    c = d / 8;  
                    m[i++] = d % 8;  
                    d = c;  
                } while (c >= 8);  
                o = d.ToString();  
                for (int j = m.Length - 1; j >= 0; j--)  
                {  
                    o += m[j];  
                }  
            }  
            return o;  
        }  
 
        //十進制轉十六進制  
        public string DtoX(int d)  
        {  
            string x = "";  
            if (d < 16)  
            {  
                x = chang(d);  
            }  
            else 
            {  
                int c;  
                int s = 0;  
                int n = d;  
                int temp = d;  
                while (n >= 16)  
                {  
                    s++;  
                    n = n / 16;  
                }  
                string [] m = new string[s];  
                int i = 0;  
                do 
                {  
                    c = d / 16;  
                    m[i++] = chang(d % 16);//判斷是否大於10，如果大於10，則轉換為A~F的格式  
                    d = c;  
                } while (c >= 16);  
                x = chang(d);  
                for (int j = m.Length - 1; j >= 0; j--)  
                {  
                    x += m[j];  
                }  
            }  
            return x;  
        }  
 
 
        //判斷是否為10~15之間的數，如果是則進行轉換  
        public string chang(int d)  
        {  
            string x = "";  
            switch (d)  
            {  
                case 10:  
                    x = "A";  
                    break;  
                case 11:  
                    x = "B";  
                    break;  
                case 12:  
                    x = "C";  
                    break;  
                case 13:  
                    x = "D";  
                    break;  
                case 14:  
                    x = "E";  
                    break;  
                case 15:  
                    x = "F";  
                    break;  
                default:  
                    x = d.ToString();  
                    break;  
            }  
            return x;  
        }  
 
        private void button1_Click(object sender, EventArgs e)  
        {  
            textBox2.Text = DtoB(Convert.ToInt32(textBox1.Text));//十轉二進制  
        }  
 
        private void button2_Click(object sender, EventArgs e)  
        {  
            textBox2.Text = DtoO(Convert.ToInt32(textBox1.Text));//十轉八進制  
        }  
 
        private void button3_Click(object sender, EventArgs e)  
        {  
            textBox2.Text = DtoX(Convert.ToInt32(textBox1.Text));//十轉十六進制  
        }  
    }  
}