[置顶] 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

这是资源的下载地址：

计算器MFC+VC++ - 下载频道 - CSDN.NET
http://download.csdn.net/detail/rl529014/8842801