C / C++ / MFC

virtual BOOL OnCmdMsg( UINT nID, int nCode, void* pExtra, AFX_CMDHANDLERINFO* pHandlerInfo );

void foo(char *& p)
{
  p="Second";
}
...
char *p="First";
foo(p);
// now p points to "Second"

void foo(char *p)
{
  p="Second";
}
...
char *p="First";
foo(p);
// p still points to "First"

class Student
{
public:
    Student(char *name, char *ID)
    {
        strcpy(m_name, name);
        strcpy(m_ID, ID);
    }
private:
  char m_name[32];
  char m_ID[10];
};

Student(char *name, char *ID)
{
    strcnpy(m_name, name, 31);
    m_name[31] = '\0';
    strncpy(m_ID, ID, 9);
    m_ID[9] = '\0';
}

class Student
{
public:
    Student(LPCTSTR szName, LPCTSTR szID)
    {
        strName = szName;
        m_strID = szID;
    }
private:
  CString m_strName;
  CString m_strID;
};

class Student
{
public:
    Student()
    {
        strName = "";
        m_strID = "";
    }
 
    BOOL SetInformation(LPCTSTR szName, LPCTSTR szID)
    {
        strName = szName;
        m_strID = szID;
        //Return TRUE if OK, return FALSE if not.
        return TRUE;
    }
private:
  CString m_strName;
  CString m_strID;
};

Student A;
Student B:
.
.
.
B = A;