MFC一个简单的计算器程序

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/dpsying/article/details/19047645

1，简介

某个晚上帮人做的一个MFC课程设计的作业。大概花了两三个小时。

（2017-6-6： 抱歉很多人反馈下载链接失效，原因是我的百度网盘之前被人恶意登录清空了所有资源。已重写工程上传，但由于目前手上只装了VS2013，上传的VS2013版MFC工程。需要的朋友自己建对应版本改下。) 

原博客效果：

新VS2013重写版本效果：

就和平常使用的计算器用法差不多。

2，源码下载

https://pan.baidu.com/s/1i5JvvDV

（2017-6-6重新上传，VS2013 MFC工程）

3，主要代码

完整头文件CalculatorDlg.h：

// CalculatorDlg.h : 头文件

#pragma once

//运算符
enum CALCULATOR_FLAG{
	FLAG_JIA = 0,
	FLAG_JIAN,
	FLAG_CHENG,
	FLAG_CHU,
	FLAG_PINGFANG,
	FLAG_KAIFANG,
};
class CCalculatorDlg : public CDialogEx
{
public:
	CCalculatorDlg(CWnd* pParent = NULL);

	enum { IDD = IDD_CALCULATOR_DIALOG };

	void SaveFirstValue();		//保存第一个输入值
	void Calculator();			//计算
public:
	afx_msg void OnButtonBack();
	afx_msg void OnButtonClear();
	afx_msg void OnButtonAbout();
	afx_msg void OnButton1();
	afx_msg void OnButton2();
	afx_msg void OnButton3();
	afx_msg void OnButton4();
	afx_msg void OnButton5();
	afx_msg void OnButton6();
	afx_msg void OnButton7();
	afx_msg void OnButton8();
	afx_msg void OnButton9();
	afx_msg void OnButton0();
	afx_msg void OnButtonDian();
	afx_msg void OnButtonChu();
	afx_msg void OnButtonCheng();
	afx_msg void OnButtonJian();
	afx_msg void OnButtonJia();
	afx_msg void OnButtonPingfang();
	afx_msg void OnButtonKaifang();
	afx_msg void OnButtonDeng();
protected:
	HICON m_hIcon;

	virtual void DoDataExchange(CDataExchange* pDX);	// DDX/DDV 支持
	virtual BOOL OnInitDialog();

	DECLARE_MESSAGE_MAP()

private:
	//编辑框内的字符串
	CString mStr;		
	//输入的2个值  
	double mNum1;
	double mNum2;
	//运算符号
	CALCULATOR_FLAG mFlag;
};

完整源文件CalculatorDlg.cpp：

// CalculatorDlg.cpp : 实现文件
//

#include "stdafx.h"
#include "Calculator.h"
#include "CalculatorDlg.h"
#include "afxdialogex.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif


// 用于应用程序“关于”菜单项的 CAboutDlg 对话框

class CAboutDlg : public CDialogEx
{
public:
	CAboutDlg();

// 对话框数据
	enum { IDD = IDD_ABOUTBOX };

	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV 支持

// 实现
protected:
	DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialogEx(CAboutDlg::IDD)
{
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialogEx::DoDataExchange(pDX);
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialogEx)
END_MESSAGE_MAP()


// CCalculatorDlg 对话框

CCalculatorDlg::CCalculatorDlg(CWnd* pParent /*=NULL*/)
	: CDialogEx(CCalculatorDlg::IDD, pParent)
	, mStr(_T(""))
{
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CCalculatorDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialogEx::DoDataExchange(pDX);
	DDX_Text(pDX, IDC_EDIT1, mStr);
}

BEGIN_MESSAGE_MAP(CCalculatorDlg, CDialogEx)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()

	ON_BN_CLICKED(IDC_BUTTON_BACK, &CCalculatorDlg::OnButtonBack)
	ON_BN_CLICKED(IDC_BUTTON_CLEAR, &CCalculatorDlg::OnButtonClear)
	ON_BN_CLICKED(IDC_BUTTON_ABOUT, &CCalculatorDlg::OnButtonAbout)
	ON_BN_CLICKED(IDC_BUTTON1, &CCalculatorDlg::OnButton1)
	ON_BN_CLICKED(IDC_BUTTON2, &CCalculatorDlg::OnButton2)
	ON_BN_CLICKED(IDC_BUTTON3, &CCalculatorDlg::OnButton3)
	ON_BN_CLICKED(IDC_BUTTON4, &CCalculatorDlg::OnButton4)
	ON_BN_CLICKED(IDC_BUTTON5, &CCalculatorDlg::OnButton5)
	ON_BN_CLICKED(IDC_BUTTON6, &CCalculatorDlg::OnButton6)
	ON_BN_CLICKED(IDC_BUTTON7, &CCalculatorDlg::OnButton7)
	ON_BN_CLICKED(IDC_BUTTON8, &CCalculatorDlg::OnButton8)
	ON_BN_CLICKED(IDC_BUTTON9, &CCalculatorDlg::OnButton9)
	ON_BN_CLICKED(IDC_BUTTON0, &CCalculatorDlg::OnButton0)
	ON_BN_CLICKED(IDC_BUTTON_DIAN, &CCalculatorDlg::OnButtonDian)
	ON_BN_CLICKED(IDC_BUTTON_CHU, &CCalculatorDlg::OnButtonChu)
	ON_BN_CLICKED(IDC_BUTTON_CHENG, &CCalculatorDlg::OnButtonCheng)
	ON_BN_CLICKED(IDC_BUTTON_JIAN, &CCalculatorDlg::OnButtonJian)
	ON_BN_CLICKED(IDC_BUTTON_JIA, &CCalculatorDlg::OnButtonJia)
	ON_BN_CLICKED(IDC_BUTTON_PINGFANG, &CCalculatorDlg::OnButtonPingfang)
	ON_BN_CLICKED(IDC_BUTTON_KAIFANG, &CCalculatorDlg::OnButtonKaifang)
	ON_BN_CLICKED(IDC_BUTTON_DENG, &CCalculatorDlg::OnButtonDeng)
END_MESSAGE_MAP()


// CCalculatorDlg 消息处理程序

BOOL CCalculatorDlg::OnInitDialog()
{
	CDialogEx::OnInitDialog();

	ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
	ASSERT(IDM_ABOUTBOX < 0xF000);

	CMenu* pSysMenu = GetSystemMenu(FALSE);
	if (pSysMenu != NULL)
	{
		BOOL bNameValid;
		CString strAboutMenu;
		bNameValid = strAboutMenu.LoadString(IDS_ABOUTBOX);
		ASSERT(bNameValid);
		if (!strAboutMenu.IsEmpty())
		{
			pSysMenu->AppendMenu(MF_SEPARATOR);
			pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
		}
	}

	SetIcon(m_hIcon, TRUE);			// 设置大图标
	SetIcon(m_hIcon, FALSE);		// 设置小图标

	return TRUE;
}

void CCalculatorDlg::OnButtonBack()
{
	UpdateData(TRUE);
	//移除最右边一个字符  
	if (!mStr.IsEmpty())
	{
		mStr = mStr.Left(mStr.GetLength() - 1);
	}
	UpdateData(FALSE);
}

void CCalculatorDlg::OnButtonClear()
{
	UpdateData(TRUE);
	mStr = L"";
	mNum1 = 0.0f;
	mNum2 = 0.0f;
	mFlag = FLAG_JIA;
	UpdateData(FALSE);
}

void CCalculatorDlg::OnButtonAbout()
{
	CAboutDlg dlg;
	dlg.DoModal();
}

void CCalculatorDlg::OnButton1()
{
	UpdateData(TRUE);
	mStr += L"1";
	UpdateData(FALSE);
}

void CCalculatorDlg::OnButton2()
{
	UpdateData(TRUE);
	mStr += L"2";
	UpdateData(FALSE);
}

void CCalculatorDlg::OnButton3()
{  
	UpdateData(TRUE);
	mStr += L"3";
	UpdateData(FALSE);
}

void CCalculatorDlg::OnButton4()
{
	UpdateData(TRUE);
	mStr += L"4";
	UpdateData(FALSE);
}

void CCalculatorDlg::OnButton5()
{
	UpdateData(TRUE);
	mStr += L"5";
	UpdateData(FALSE);
}

void CCalculatorDlg::OnButton6()
{
	UpdateData(TRUE);
	mStr += L"6";
	UpdateData(FALSE);
}

void CCalculatorDlg::OnButton7()
{
	UpdateData(TRUE);
	mStr += L"7";
	UpdateData(FALSE);
}

void CCalculatorDlg::OnButton8()
{
	UpdateData(TRUE);
	mStr += L"8";
	UpdateData(FALSE);
}

void CCalculatorDlg::OnButton9()
{
	UpdateData(TRUE);
	mStr += L"9";
	UpdateData(FALSE);
}

void CCalculatorDlg::OnButton0()
{
	UpdateData(TRUE);
	mStr += L"0";
	UpdateData(FALSE);
}

//小数点按钮  
void CCalculatorDlg::OnButtonDian()
{
	UpdateData(TRUE);
	//如果没有小数点，则加上一个小数点，如果已有小数点就忽略此次的小数点，保证最多只有1个  
	if (-1 == mStr.Find(L'.'))
	{
		mStr += L".";
	}
	UpdateData(FALSE);
}

//加
void CCalculatorDlg::OnButtonJia()
{
	SaveFirstValue();
	mFlag = FLAG_JIA;

}

//减
void CCalculatorDlg::OnButtonJian()
{
	SaveFirstValue();
	mFlag = FLAG_JIAN;
}

//乘
void CCalculatorDlg::OnButtonCheng()
{
	SaveFirstValue();
	mFlag = FLAG_CHENG;
}

//除
void CCalculatorDlg::OnButtonChu()
{ 
	SaveFirstValue();
	mFlag = FLAG_CHU;
}

//平方
void CCalculatorDlg::OnButtonPingfang()
{
	UpdateData(TRUE);
	mNum1 = _wtof(mStr);
	double f = mNum1 * mNum1;
	//如果浮点数其实是个整数,就显示为整数
	if (f - int(f) <= 1e-5)
	{
		mStr.Format(L"%d", (int)f);
	}
	else
	{
		mStr.Format(L"%f", f);
	}
	UpdateData(FALSE);

	mNum1 = f;
	mNum2 = 0.0f;
	mFlag = FLAG_PINGFANG;
}

//开方
void CCalculatorDlg::OnButtonKaifang()
{
	UpdateData(TRUE);
	mNum1 = _wtof(mStr);
	double f = sqrt(mNum1);
	//如果浮点数其实是个整数,就显示为整数
	if (f - int(f) <= 1e-5)
	{
		mStr.Format(L"%d", (int)f);
	}
	else
	{
		mStr.Format(L"%f", f);
	}
	UpdateData(FALSE);

	mNum1 = f;
	mNum2 = 0.0f;
	mFlag = FLAG_KAIFANG;
}

//等于
void CCalculatorDlg::OnButtonDeng()
{
	Calculator();
}

//保存第一个输入值
void CCalculatorDlg::SaveFirstValue()
{
	UpdateData(TRUE);
	mNum1 = _wtof(mStr);
	mStr = L"";
	UpdateData(FALSE);
}

//计算结果
void CCalculatorDlg::Calculator()
{
	UpdateData(TRUE);
	mNum2 = _wtof(mStr);
	double result = 0.0f;
	switch (mFlag)
	{
	case FLAG_JIA:						//加  
		result = mNum1 + mNum2;
		break;
	case FLAG_JIAN:						//减 
		result = mNum1 - mNum2;
		break;
	case FLAG_CHENG:					//乘  
		result = mNum1 * mNum2;
		break;
	case FLAG_CHU:						//除  
		if (mNum2 == 0.0f)
		{
			result = mNum1;
		}
		else
		{
			result = mNum1 / mNum2;
		}
		break;
	case FLAG_PINGFANG:					//平方 
		result = mNum2 * mNum2;
		break;
	case FLAG_KAIFANG:					//开方  
		result = sqrt(mNum2);
		break;
	default:
		break;
	}
	//如果浮点数其实是个整数,就显示为整数
	if (result - int(result) <= 1e-5)
	{
		mStr.Format(L"%d", (int)result);
	}
	else
	{
		mStr.Format(L"%f", result);
	}
	UpdateData(FALSE);

	mNum1 = result;
	mNum2 = 0.0f;
}

最后希望大家课程设计都能够顺利过关！！