关于CLASS的public和private
#include <IOSTREAM>
class CData
{
private:
int m_nDay;// Lets assume all months have 30 days!
int m_nMonth;
int m_nYear;
void AddDays(int nDaysToAdd)
{
m_nDay = m_nDay + nDaysToAdd;
if (30 < m_nDay)
{
AddMonths(m_nDay / 30);
m_nDay %= 30;
}
}
void AddMonths (int nMonthsToAdd)
{
m_nMonth = m_nMonth + nMonthsToAdd;
if (12 < m_nMonth)
{
AddYears(m_nMonth / 12);
m_nMonth = m_nMonth % 12;
}
}
void AddYears(int m_nYearsToAdd)
{
m_nYear = m_nYear + m_nYearsToAdd;
}
public:
CDate(int nDay, int nMonth, int nYear)
: m_nDay(nDay), m_nMonth(nMonth), m_nYear(nYear) {};
CData& operator ++()
{
CData mReturnDate(m_nDay, m_nMonth, m_nYear);
AddDays(1);
return mReturnDate;
}
void DisplayDate()
{
std::cout << m_nDay << " / " << m_nMonth << " / " << m_nYear;
}
};
int main(void)
{
CDate mDate(25, 6, 2008);
std::cout << "The date object is initialized to: ";
mDate.DisplayDate();
std::cout << std::endl;
++mDate;
std::cout << "Date after prefix-increment is: ";
mDate.DisplayDate();
std::cout << std::endl;
return 0;
}
