C / C++ / MFC

afx_msg void OnMyNewHandler()

ON_COMMAND(IDC_OF_COMMAND, OnMyNewHandler)

void CMyClass::OnMyNewHandler()
{
//code
}

afx_msg void OnUpdateMyNewHandler(CCmdUI *pCmdUI) ;

ON_UPDATE_COMMAND_UI(IDC_OF_COMMAND, OnUpdateMyNewHandler)

void CMyClass::OnUpdateMyNewHandler(CCmdUI *pCmdUI)
{
pCmdUI->Enable(...) ;
}

// declaring
int arrayUninit[26][26];
int arrayInit[26][26] = {
  { 0, 1, 2, ..., 25 },
  { 0, 1, 2, ..., 25 },
  ...
};

// Clearing all
memeset(arrayUnint, 0, 26 * 26 * sizeof(int));

// accessing elements
for (int x = 0; x < 26; x++)
  for (int y = 0; y < 26; y++)
    arrayUninit[x][y] = ...;