基本信息
源码名称:c++ 浮点数二进制格式
源码大小:0.03M
文件格式:.zip
开发语言:C/C++
更新时间:2019-04-09
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源码介绍
输入一个十进制浮点数返回它的二进制表现
输入一个十进制浮点数返回它的二进制表现
// FltDlg.cpp : implementation file // #include "stdafx.h" #include "Flt.h" #include "FltDlg.h" #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif union FDATA // Declare union type { BYTE ch[4]; float f; } ; ///////////////////////////////////////////////////////////////////////////// // CFltDlg dialog CFltDlg::CFltDlg(CWnd* pParent /*=NULL*/) : CDialog(CFltDlg::IDD, pParent) { //{{AFX_DATA_INIT(CFltDlg) m_1 = 0.0f; m_2 = _T(""); m_3 = _T(""); //}}AFX_DATA_INIT m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); } void CFltDlg::DoDataExchange(CDataExchange* pDX) { CDialog::DoDataExchange(pDX); //{{AFX_DATA_MAP(CFltDlg) DDX_Text(pDX, IDC_EDIT1, m_1); DDX_Text(pDX, IDC_EDIT2, m_2); DDX_Text(pDX, IDC_EDIT3, m_3); //}}AFX_DATA_MAP } BEGIN_MESSAGE_MAP(CFltDlg, CDialog) //{{AFX_MSG_MAP(CFltDlg) ON_WM_PAINT() ON_WM_QUERYDRAGICON() ON_BN_CLICKED(IDC_BUTTON1, OnButton1) ON_EN_CHANGE(IDC_EDIT1, OnChangeEdit1) //}}AFX_MSG_MAP END_MESSAGE_MAP() ///////////////////////////////////////////////////////////////////////////// // CFltDlg message handlers BOOL CFltDlg::OnInitDialog() { CDialog::OnInitDialog(); SetIcon(m_hIcon, TRUE); // Set big icon SetIcon(m_hIcon, FALSE); // Set small icon // TODO: Add extra initialization here return TRUE; // return TRUE unless you set the focus to a control } // 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 CFltDlg::OnPaint() { if (IsIconic()) { CPaintDC dc(this); // device context for painting SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); // Center icon in client rectangle int 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 icon dc.DrawIcon(x, y, m_hIcon); } else { CDialog::OnPaint(); } } HCURSOR CFltDlg::OnQueryDragIcon() { return (HCURSOR) m_hIcon; } void CFltDlg::OnButton1() { // TODO: Add your control notification handler code here /* 浮点数格式如下: s eeeeeeee wwwwwww wwwwwwww wwwwwwww s =符号位,0正1负 e =指数位,运算值:eeeeeeee-01111111 w =尾数位,默认尾数前1个bit=1,即应读做24bit: 1wwwwwww wwwwwwww wwwwwwww EXAMPLE -6.8 = C0D9999A ;内存中存放:9A 99 D9 C0 基本函数 01(3) 标号: FMUL 功能:浮点数乘法 02(4) 标号: FDIV 功能:浮点数除法 03(5) 标号: FMOV 功能:浮点数传送 04(6) 标号: FCMP 功能:浮点数代数值比较(不影响待比较操作数) 05(7) 标号: FADD 功能:浮点数加法 06(8) 标号: FSUB 功能:浮点数减法 07(9) 标号: DTOF 功能:三字节十六进制定点数转换成格式化浮点数 08(10)标号: FINT 功能:浮点取整函数 09(11)标号: FSGN 功能:浮点符号函数 10(12)标号: FCLR 功能:浮点数清零 11(13)标号: FZER 功能:浮点数判零 */ FDATA v; int i,ib,yb; BYTE byt[8]={1,2,4,8,16,32,64,128}; BYTE bwk; CString str; v.f=m_1; for(i=31;i>=0;i--){ if((i==30)||(i==22))str =" "; ib=i/8; yb=i%8; if((v.ch[ib]&byt[yb])==byt[yb])str ="1"; else str ="0"; } m_2=str; str.Empty(); for(i=3;i>=0;i--){ bwk=v.ch[i]&0x0f0;bwk>>=4;bwk ='0'; if(bwk>'9')bwk =7; str =bwk; bwk=v.ch[i]&0x0f;bwk ='0'; if(bwk>'9')bwk =7; str =bwk; } m_3=str; UpdateData(FALSE); } void CFltDlg::OnChangeEdit1() { // TODO: If this is a RICHEDIT control, the control will not // send this notification unless you override the CDialog::OnInitDialog() // function and call CRichEditCtrl().SetEventMask() // with the ENM_CHANGE flag ORed into the mask. // TODO: Add your control notification handler code here UpdateData(TRUE); }