MFC，VC++计算器小程序

大学期末没课，某个中午闲来无聊，正好在自学ＭＦＣ，于是想用ＭＦＣ、Ｃ＋＋写点东西，由于能力有限，当然的写个简单点的啦，于是花了两个小时写了这个计算器的小程序，希望对初学VC++和ＭＦＣ的朋友有所帮助。程序运行效果如下：

（1）首先按上图添加控件；

（2）然后在Dlg类的头文件中添加如下的变量，功能如注释所示：

（3）下面是程序的主要代码：

void CMyDlg::OnZero() 
{
  // TODO: Add your control notification handler code here
  m_showend+="0";
  UpdateData(false);
}


void CMyDlg::OnOne() 
{
  // TODO: Add your control notification handler code here
    m_showend+="1";
  UpdateData(false);
}


void CMyDlg::OnTwo() 
{
  // TODO: Add your control notification handler code here
    m_showend+="2";
  UpdateData(false);
}


void CMyDlg::OnThree() 
{
  // TODO: Add your control notification handler code here
    m_showend+="3";
  UpdateData(false);
}


void CMyDlg::OnFour() 
{
  // TODO: Add your control notification handler code here
    m_showend+="4";
  UpdateData(false);
}


void CMyDlg::OnFive() 
{
  // TODO: Add your control notification handler code here
    m_showend+="5";
  UpdateData(false);
}


void CMyDlg::OnSix() 
{
  // TODO: Add your control notification handler code here
    m_showend+="6";
  UpdateData(false);
}


void CMyDlg::OnSeven() 
{
  // TODO: Add your control notification handler code here
    m_showend+="7";
  UpdateData(false);
}


void CMyDlg::OnEight() 
{
  // TODO: Add your control notification handler code here
    m_showend+="8";
  UpdateData(false);
}


void CMyDlg::OnNine() 
{
  // TODO: Add your control notification handler code here
    m_showend+="9";
  UpdateData(false);
}


void CMyDlg::OnClearEditBox() //此函数用于清空编辑框信息
{
  // TODO: Add your control notification handler code here
  m_showend="";
  operand_one=0.0;
  operand_two=0.0;
  UpdateData(false);  //更新编辑框信息
}


void CMyDlg::OnRun() 
{
  // TODO: Add your control notification handler code here
  operand_two=atof(m_showend);
  double end=0.0;


  //此处为判断操作的类型；
  if(operate==add)
  {
    end=operand_one+operand_two;
    m_showend.Format("%g",end);
  }
  else if(operate==subtraction)
  {
    end=operand_one-operand_two;
    m_showend.Format("%g",end);
  }
  else if(operate==multiplication)
  {
    end=operand_one*operand_two;
    m_showend.Format("%g",end);
  }
  else if(operate==division)
  {
    end=operand_one/operand_two;
    m_showend.Format("%g",end);
  }
  UpdateData(false);
}


void CMyDlg::OnDivision() //除法运算
{
  // TODO: Add your control notification handler code here
  operand_one=atof(m_showend);
  m_showend="";
  UpdateData(false);


  operate=division;//操作类型为“除”；
}


void CMyDlg::OnMultiplication() //乘法运算
{
  // TODO: Add your control notification handler code here
  operand_one=atof(m_showend);
  m_showend="";
  UpdateData(false);


  operate=multiplication;//操作类型为“乘”；
}


void CMyDlg::OnSubtraction() //减法运算
{
  // TODO: Add your control notification handler code here
  operand_one=atof(m_showend);
  m_showend="";
  UpdateData(false);


  operate=subtraction;//操作类型为“减”；
}


void CMyDlg::OnAdd() //加法运算
{
  // TODO: Add your control notification handler code here
  operand_one=atof(m_showend);
  m_showend="";
  UpdateData(false);


  operate=add;//操作类型为“加”；


}


void CMyDlg::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags) 
{
  // TODO: Add your message handler code here and/or call default
  AfxMessageBox("345234");
  switch(nChar)
  {
    case 48:CMyDlg::OnZero();break; 
    case 49:CMyDlg::OnOne();break;
    case 50:CMyDlg::OnTwo();break;
    case 51:CMyDlg::OnThree();break;
    case 52:CMyDlg::OnFour();break;
    case 53:CMyDlg::OnFive();break;
    case 54:CMyDlg::OnSix();break;
    case 55:CMyDlg::OnSeven();break;
    case 56:CMyDlg::OnEight();break;
    case 57:CMyDlg::OnNine();break;
    default:break;
  }
  CDialog::OnKeyDown(nChar, nRepCnt, nFlags);
}


BOOL CMyDlg::PreTranslateMessage(MSG* pMsg) 
{
  // TODO: Add your specialized code here and/or call the base class
  if(pMsg->message == WM_KEYDOWN)
  {
    if(pMsg->wParam==VK_ESCAPE)  //忽略掉键盘上的esc按键消息
    {
      return true;
    }
    //CMyDlg::OnKeyDown(nChar, nRepCnt, nFlags) ;
    switch(pMsg->wParam) 
    {
      case 48:CMyDlg::OnZero();break; 
      case 49:CMyDlg::OnOne();break;
      case 50:CMyDlg::OnTwo();break;
      case 51:CMyDlg::OnThree();break;
      case 52:CMyDlg::OnFour();break;
      case 53:CMyDlg::OnFive();break;
      case 54:CMyDlg::OnSix();break;
      case 55:CMyDlg::OnSeven();break;
      case 56:CMyDlg::OnEight();break;
      case 57:CMyDlg::OnNine();break;
      default:break;
    
    }
  }
  return CDialog::PreTranslateMessage(pMsg);
}

以上是程序的主要代码；

当然了，还得为编辑框添加一个ＣＳｔｒｉｎｇ类型的变量，用来保存输入的数据；下面是对话框头文件中需要定义的变量

主要的代码就这些吧，怎么添加响应函数就不用说了吧，嘿嘿