C++第十五周【任务1】实现三角形的周长和面积的程序设计

/*
* 程序的版权和版本声明部分
* Copyright (c) 2011, 烟台大学计算机学院学生 
* All rights reserved.
* 文件名称：C++第十五周【任务1】                              
* 作    者：   李洪悬                              
* 完成日期：   2012  年  5  月 30 日
* 对任务及求解方法的描述部分

* 输入描述：三角形的三边长

* 问题描述：计算三角形的周长和面积

* 程序输出：三角形的周长和面积

*/

【任务1】在《窗口程序设计及MFC 启蒙》一文案例的基础上，为应用程序增加求周长的功能。在报告中展示主要的代码（至少包括自己定义的代码和包含通过在界面上设置产生的代码——理解文中“进一步的回味”部分。），以及两张用不同输入得到的运行结果的截图。

 

头文件程序代码：

class Triangle{public:Triangle(){a=1;b=1;c=1;}Triangle(double x,double y,double z){a=x;b=y;c=z;}double area(void);double girth(void);private:double a,b,c;};

源文件程序代码：

#include"stdafx.h"#include<Cmath>#include"MyTriangle.h"double Triangle::area(void){double s = (a+b+c)/2;return sqrt(s*(s-a)*(s-b)*(s-c));}double Triangle::girth(void){double l = a+b+c;return l;}

额外代码：

void CtriangleDlg::OnBnClickedButton1(){// TODO: Add your control notification handler code hereUpdateData();Triangle t1(m_a,m_b,m_c);m_area=t1.area();    UpdateData(FALSE);}void CtriangleDlg::OnBnClickedButton2(){// TODO: Add your control notification handler code hereUpdateData();Triangle t1(m_a,m_b,m_c);m_girth=t1.girth();    UpdateData(FALSE);}

 

内部代码：

// triangleDlg.cpp : implementation file//#include "stdafx.h"#include "triangle.h"#include "triangleDlg.h"#include "MyTriangle.h"#ifdef _DEBUG#define new DEBUG_NEW#endif// CAboutDlg dialog used for App Aboutclass CAboutDlg : public CDialog{public:CAboutDlg();// Dialog Dataenum { IDD = IDD_ABOUTBOX };protected:virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support// Implementationprotected:DECLARE_MESSAGE_MAP()};CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD){}void CAboutDlg::DoDataExchange(CDataExchange* pDX){CDialog::DoDataExchange(pDX);}BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)END_MESSAGE_MAP()// CtriangleDlg dialogCtriangleDlg::CtriangleDlg(CWnd* pParent /*=NULL*/): CDialog(CtriangleDlg::IDD, pParent), m_a(0), m_b(0), m_c(0), m_area(0), m_girth(0){m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);}void CtriangleDlg::DoDataExchange(CDataExchange* pDX){CDialog::DoDataExchange(pDX);DDX_Text(pDX, IDC_EDIT1, m_a);DDX_Text(pDX, IDC_EDIT2, m_b);DDX_Text(pDX, IDC_EDIT3, m_c);DDX_Text(pDX, IDC_EDIT4, m_area);DDX_Text(pDX, IDC_EDIT5, m_girth);}BEGIN_MESSAGE_MAP(CtriangleDlg, CDialog)ON_WM_SYSCOMMAND()ON_WM_PAINT()ON_WM_QUERYDRAGICON()//}}AFX_MSG_MAPON_BN_CLICKED(IDC_BUTTON1, &CtriangleDlg::OnBnClickedButton1)ON_BN_CLICKED(IDC_BUTTON2, &CtriangleDlg::OnBnClickedButton2)END_MESSAGE_MAP()// CtriangleDlg message handlersBOOL CtriangleDlg::OnInitDialog(){CDialog::OnInitDialog();// Add "About..." menu item to system menu.// IDM_ABOUTBOX must be in the system command range.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);}}// Set the icon for this dialog.  The framework does this automatically//  when the application's main window is not a dialogSetIcon(m_hIcon, TRUE);// Set big iconSetIcon(m_hIcon, FALSE);// Set small icon// TODO: Add extra initialization herereturn TRUE;  // return TRUE  unless you set the focus to a control}void CtriangleDlg::OnSysCommand(UINT nID, LPARAM lParam){if ((nID & 0xFFF0) == IDM_ABOUTBOX){CAboutDlg dlgAbout;dlgAbout.DoModal();}else{CDialog::OnSysCommand(nID, lParam);}}// If you add a minimize button to your dialog, you will need the code below//  to draw the icon.  For MFC applications using the document/view model,//  this is automatically done for you by the framework.void CtriangleDlg::OnPaint(){if (IsIconic()){CPaintDC dc(this); // device context for paintingSendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);// Center icon in client rectangleint cxIcon = GetSystemMetrics(SM_CXICON);int cyIcon = GetSystemMetrics(SM_CYICON);CRect rect;GetClientRect(&rect);int x = (rect.Width() - cxIcon + 1) / 2;int y = (rect.Height() - cyIcon + 1) / 2;// Draw the icondc.DrawIcon(x, y, m_hIcon);}else{CDialog::OnPaint();}}// The system calls this function to obtain the cursor to display while the user drags//  the minimized window.HCURSOR CtriangleDlg::OnQueryDragIcon(){return static_cast<HCURSOR>(m_hIcon);}void CtriangleDlg::OnBnClickedButton1(){// TODO: Add your control notification handler code hereUpdateData();Triangle t1(m_a,m_b,m_c);m_area=t1.area();    UpdateData(FALSE);}void CtriangleDlg::OnBnClickedButton2(){// TODO: Add your control notification handler code hereUpdateData();Triangle t1(m_a,m_b,m_c);m_girth=t1.girth();    UpdateData(FALSE);}

MFC输出结果：

 经验积累：

不错！不错！这次做的很顺手！内部代码很好！但只能看懂一点！再有MFC比黑方框好看多啦！