C / C++ / MFC

/* Standard error macro for reporting API errors */ 
#define PERR(bSuccess, api){if(!(bSuccess)) printf("%s:Error %d from %s \ 
    on line %d\n", __FILE__, GetLastError(), api, __LINE__);}

void cls( HANDLE hConsole )
 {
    COORD coordScreen = { 0, 0 };    /* here's where we'll home the
                                        cursor */ 
    BOOL bSuccess;
    DWORD cCharsWritten;
    CONSOLE_SCREEN_BUFFER_INFO csbi; /* to get buffer info */ 
    DWORD dwConSize;                 /* number of character cells in
                                        the current buffer */ 

    /* get the number of character cells in the current buffer */ 

    bSuccess = GetConsoleScreenBufferInfo( hConsole, &csbi );
    PERR( bSuccess, "GetConsoleScreenBufferInfo" );
    dwConSize = csbi.dwSize.X * csbi.dwSize.Y;

    /* fill the entire screen with blanks */ 

    bSuccess = FillConsoleOutputCharacter( hConsole, (TCHAR) ' ',
       dwConSize, coordScreen, &cCharsWritten );
    PERR( bSuccess, "FillConsoleOutputCharacter" );

    /* get the current text attribute */ 

    bSuccess = GetConsoleScreenBufferInfo( hConsole, &csbi );
    PERR( bSuccess, "ConsoleScreenBufferInfo" );

    /* now set the buffer's attributes accordingly */ 

    bSuccess = FillConsoleOutputAttribute( hConsole, csbi.wAttributes,
       dwConSize, coordScreen, &cCharsWritten );
    PERR( bSuccess, "FillConsoleOutputAttribute" );

    /* put the cursor at (0, 0) */ 

    bSuccess = SetConsoleCursorPosition( hConsole, coordScreen );
    PERR( bSuccess, "SetConsoleCursorPosition" );
    return;
 }

CMyWinApp::Whatever()
{
  CDialog1 *myDlg;
  CDialog2 *myDlg2;
  BOOL      bShowDlg1=TRUE;

  do {
    if (bShowDlg1) {
      myDlg = new CDialog1;
      myDlg.DoModal();
      delete myDlg;
      bShowDlg1=FALSE;
    } else {
      myDlg2 = new CDialog2;
      myDlg2.DoModal();
      delete myDlg2;
      bShowDlg1=TRUE;
    }
  } while (TRUE);
}

Then, in your dialogs:

CDialog1::OnClick()
{
  // i want to close this dialog:
  PostMessage(WM_CLOSE,0,0);
}

CMyObject arrayMyObjects[10];

for (int i=0; i<10; i++) 
{
  arrayMyObjects[i].Initialise(or,whatever,you,want,to,do);
}

// arrayMyObjects is a pointer