MFC 進制轉換

//將16進制的一個字符轉換爲十進制的數
unsigned char CConvNumsDlg::BtoH(char ch)
{
 //0-9
 if (ch >= '0' && ch <= '9') 
  return (ch - '0');         

 //9-15
 if (ch >= 'A' && ch <= 'F') 
  return (ch - 'A' + 0xA);   

 //9-15
 if (ch >= 'a' && ch <= 'f')
  return (ch - 'a' + 0xA);  
 return(255); 
}

//轉換十進制數
void CConvNumsDlg::OnDecimalConv() 
{
 UpdateData(TRUE <a href="http://www.bashkiaprrenjas.com/">online blackjack united states</a>);
 //先轉換爲二進制
 m_strBinary = DecimalToBinary(m_strDecimal);

 //再轉換爲十六進制
 m_strHex = BinaryToHex(m_strBinary);
 UpdateData(FALSE);
}

//轉換二進制數
void CConvNumsDlg::OnBinaryConv() 
{
 UpdateData(TRUE);
 //轉換爲十進制
 m_strDecimal = BinaryToDecimal(m_strBinary);

 //轉換爲十六進制
 m_strHex = BinaryToHex(m_strBinary);
 UpdateData(FALSE);
}

//轉換十六進制數
void CConvNumsDlg::OnHexConv() 
{
 UpdateData(TRUE);
 //先轉換爲二進制
 m_strBinary = HexToBinary(m_strHex);

 //再轉換爲十進制
 m_strDecimal = BinaryToDecimal(m_strBinary);
 UpdateData(FALSE);
}

//轉換十六進制爲二進制
CString CConvNumsDlg::HexToBinary(CString strHex)
{
 int nLenth = strHex.GetLength();
 char* Hex = new char[nLenth];
 Hex = strHex.GetBuffer(0);
 CString strBinary = "";
 for(int i=0;i&lt;nLenth;i++)
 {
  //轉換一位十六進制數爲十進制
  char h = Hex[nLenth-1-i];
  int j = BtoH(h);
  CString str;
  str.Format("%d",j);

  //轉換十進制爲4爲二進制
  str = DecimalToBinary(str);
  strBinary += str;
 }
 return strBinary;
}

//轉換二進制爲十六進制
CString CConvNumsDlg::BinaryToHex(CString strBinary)
{
 int nLength = strBinary.GetLength();
 CString str = strBinary;
 //位數不是四的倍數時補齊
 switch(nLength%4)
 {
 case 0:
  break;
 case 1:
  strBinary.Format("%d%d%d%s",0,0,0,str);
  break;
 case 2:
  strBinary.Format("%d%d%s",0,0,str);
  break;
 case 3:
  strBinary.Format("%d%s",0,str);
  break;
 default:
  return "";
  break;
 }

 CString strHex,str1;
 str1 = "";
 nLength = strBinary.GetLength();
 for(int i=1;i&lt;=(nLength/4);i++)
 {
  //每四位二進制數轉換爲一十六進制數
  str = strBinary.Left(4);
  CString strDecimal = BinaryToDecimal(str);
  int nDecimal = atoi(strDecimal.GetBuffer(0));
  if(nDecimal&lt;10)
   str1.Format("%d",nDecimal);
  else
  {
   char c = 'A' + (nDecimal-10);
   str1.Format("%c",c);
  }
  strHex += str1;
  strBinary = strBinary.Right(strBinary.GetLength()-str.GetLength());
 }
 return strHex;
}

//轉換十進制爲二進制
CString CConvNumsDlg::DecimalToBinary(CString strDecimal)
{
 int nDecimal = atoi(strDecimal.GetBuffer(0));

 int nYushu; //餘數
 int nShang; //商
 CString strBinary = "";
 char buff[2];
 CString str = "";
 BOOL bContinue = TRUE;
 while(bContinue)
 {
  nYushu = nDecimal%2;
  nShang = nDecimal/2;
  sprintf(buff,"%d",nYushu);
  str = strBinary;
  strBinary.Format("%s%s",buff,str);
  nDecimal = nShang;
  if(nShang==0)
   bContinue = FALSE;
 }
 return strBinary;
}

//轉換二進制爲十進制
CString CConvNumsDlg::BinaryToDecimal(CString strBinary)
{
 int nLenth = strBinary.GetLength();
 char* Binary = new char[nLenth];
 Binary = strBinary.GetBuffer(0);
 int nDecimal = 0;
 for(int i=0;i&lt;nLenth;i++)
 {
  char h = Binary[nLenth-1-i];
  char str[1];
  str[0] = h;
  int j = atoi(str);
  for(int k=0;k&lt;i;k++)
  {
   j=j*2;
  }
  nDecimal += j;
 }
 CString strDecimal;

 strDecimal.Format("%d",nDecimal);
 return strDecimal;
}