#define IDR_MENU1                       101

#define IDM_DIALOG1                     102

#define IDR_ACCELERATOR1                103

#define IDC_EDIT1                       1000

#define IDC_EDIT2                       1001

#define IDC_EDIT3                       1002

#define IDC_EDIT4                       1003

#define IDC_BUTTON1                     1004

#define ID_FILE_MAYTINH                 40001

#define ID_FILE_THOAT                   40003

IDR_MENU1 MENU DISCARDABLE

BEGIN

    POPUP "&File"

    BEGIN

        MENUITEM "&May tinh\tCtrl+M",           ID_FILE_MAYTINH

        MENUITEM "&Close\tCtrl+Z",              ID_FILE_THOAT

    END

END

IDM_DIALOG1 DIALOG DISCARDABLE  0, 0, 344, 262

STYLE DS_MODALFRAME | WS_POPUP | WS_CAPTION | WS_SYSMENU

CAPTION "Bai 1"

FONT 8, "MS Sans Serif"

BEGIN

    DEFPUSHBUTTON   "OK",IDOK,121,206,97,25

    PUSHBUTTON      "Giai phuong trinh",IDC_BUTTON1,121,126,95,26

    LTEXT           "He so a:",IDC_STATIC,19,63,30,12

    EDITTEXT        IDC_EDIT1,55,63,142,14,ES_AUTOHSCROLL

    LTEXT           "He so b:",IDC_STATIC,19,80,27,14

    EDITTEXT        IDC_EDIT2,55,81,142,13,ES_AUTOHSCROLL

    LTEXT           "He so c:",IDC_STATIC,19,98,31,22

    EDITTEXT        IDC_EDIT3,56,99,141,14,ES_AUTOHSCROLL

    EDITTEXT        IDC_EDIT4,25,172,281,14,ES_AUTOHSCROLL

    LTEXT           "CHUONG TRINH GIAI PHUONG TRINH BAC HAI",IDC_STATIC,80,

                    33,168,22

END

#include<afxwin.h>

#include<math.h>

#include"resource.h"

class CMyApp:public CWinApp

{

public:

    BOOL InitInstance();

};

CMyApp theApp;

class CMyDialog:public CDialog

{

public:

    CMyDialog(UINT ID, CWnd*owner=NULL):CDialog(ID,owner){}

    BOOL OnInitDialog();

    afx_msg void OnGiaiPT();

    DECLARE_MESSAGE_MAP()

};

BEGIN_MESSAGE_MAP(CMyDialog,CDialog)

 ON_COMMAND(IDC_BUTTON1,OnGiaiPT)

END_MESSAGE_MAP()

BOOL CMyApp::InitInstance()

{

    m_pMainWnd=new CMyDialog(IDM_DIALOG1,NULL);

    int kq=((CMyDialog*)m_pMainWnd)->DoModal();

    return true;

}

BOOL CMyDialog::OnInitDialog()

{

    return true;

}

afx_msg void CMyDialog::OnGiaiPT()

{

    double a,b,c,d,x1,x2;

    char s[20];

    CEdit*ed;

    ed=(CEdit*)GetDlgItem(IDC_EDIT1);

    ed->GetWindowText(s,20);

    a=atof(s);

    ed=(CEdit*)GetDlgItem(IDC_EDIT2);

    ed->GetWindowText(s,20);

    b=atof(s);

    ed=(CEdit*)GetDlgItem(IDC_EDIT3);

    ed->GetWindowText(s,20);

    c=atof(s);

    ed=(CEdit*)GetDlgItem(IDC_EDIT4);

    d=b*b-4*a*c;

    if(a==0)

        sprintf(s,"He so a bang 0 khong thuc hien");

    else

    {

        if(d<0)

            sprintf(s,"Phuong trinh vo nghiem");

        else

        {

            if(d==0)

                sprintf(s,"PT co nghiem kep x1=x2=%-0.5lf",-b/(a*2));

            else

            {

                x1=(-b+sqrt(d))/(2*a);

                x2=(-b-sqrt(d))/(2*a);

                sprintf(s,"PT co 2 nghiem x1=%-0.5lf & x2=%-0.5lf",x1,x2);

            }

        }

    }

    ed->SetWindowText(s);

}