C / C++ / MFC

// the OK button starts off as disabled
 
BEGIN_MESSAGE_MAP(CMyDlg, CDialog)
    //{{AFX_MSG_MAP(CMyDlg)
    ON_EN_CHANGE(IDC_EDIT1, UpdateControls)
    ON_EN_CHANGE(IDC_EDIT2, UpdateControls)
    ON_EN_CHANGE(IDC_EDIT3, UpdateControls)
    //}}AFX_MSG_MAP
END_MESSAGE_MAP()
 
void CMyDlg::UpdateControls( void ) 
{
    bool bEnable = true;
 
    // all three edit controls must be non-empty
    bEnable &= (m_edit1.GetWindowTextLength() > 0);
    bEnable &= (m_edit2.GetWindowTextLength() > 0);
    bEnable &= (m_edit3.GetWindowTextLength() > 0);
 
    // the third edit control must be within range
    CString str;
    m_edit3.GetWindowText(str);
    bEnable &= (atoi(str) >= 0 && atoi(str) <= 200);
 
    m_btnOK.EnableWindow(bEnable);
}

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

int Number = 57;        // For example
char szString[255];
strcpy(szString,"");

while (true)
{
      if (Number>=27)
      {
          strcat(szString,"a");
          Number -= 26;
      }
      else
      {
          char Temp;
          Temp = Number + 97;    // 97 is the ASCII code for 'a'
          int StrLen = strlen(szString);
          szString[StrLen] = Temp;
          szString[StrLen+1] = '\0';
          break;      //end while loop
      }
}

<br />
	CString	str;<br />
	int number = 53;<br />
<br />
	do<br />
	{<br />
		number--;<br />
		str.Insert(0, 'a' + (number % 26));<br />
		number /= 26;<br />
	}<br />
	while (number > 0);<br />
<br />
	TRACE(_T("str: %s"), str);<br />

<font color=blue>int</font> iVal = 453; <font color=green>// For example</font>
<font color=blue>char</font> Result[5] = <font color=gray>""</font>;
 
<font color=blue>if</font> (iVal >= 17577) {  <font color=green>// For the most left character</font>
    Result[0] = (iVal % 26) - 1 + <font color=gray>'A'</font>;
}
<font color=blue>else</font> {
    Result[0] = <font color=gray>'\0'</font>;
}
 
<font color=blue>if</font> (iVal >= 677) {  <font color=green>// For the second left character</font>
    Result[1] = (iVal % 26) - 1 + <font color=gray>'A'</font>;
}
<font color=blue>else</font> {
    Result[1] = <font color=gray>'\0'</font>;
}
 
<font color=blue>if</font> (iVal >= 27) {  <font color=green>// For the third left character</font>
    Result[2] = (iVal % 26) - 1 + <font color=gray>'A'</font>;
}
<font color=blue>else</font> {
    Result[2] = <font color=gray>'\0'</font>;
}

<font color=blue>if</font> (iVal >= 1) {  <font color=green>// For the most right character</font>
    Result[3] = (iVal % 26) - 1 + <font color=gray>'A'</font>;
}
<font color=blue>else</font> {
    Result[3] = <font color=gray>'\0'</font>;
}
 
Result[4] = <font color=gray>'\0'</font>;
 
<font color=green>// Re-order the string (erases the '\0' at the beginning of the string)...</font>
<font color=blue>for</font> (int</font> i = 0, i < 4, i++) {
    <font color=blue>if</font> (Result[1] == <font color=gray>'\0'</font>) {
        Result[i] = Result[i+1];
    }
}