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856天前#include <iostream> |
class CDate { |
private: |
int m_nDay; // Range: 1 - 30 (lets assume all months have 30 days! |
int m_nMonth; // Range: 1 - 12 |
int m_nYear; |
void AddDays(int nDaysToAdd) { |
m_nDay += nDaysToAdd; |
if (m_nDay > 30) { |
AddMonths(m_nDay / 30); |
m_nDay %= 30; // rollover 30th -> 1st |
} |
} |
void AddMonths(int nMonthsToAdd) { |
m_nMonth += nMonthsToAdd; |
if (m_nMonth > 12) { |
AddYears(m_nMonth / 12); |
m_nMonth %= 12; // rollover dec -> jan |
} |
} |
void AddYears(int m_nYearsToAdd) { |
m_nYear += m_nYearsToAdd; |
} |
public: |
// Constructor that initializes the object to a day, month and year |
CDate(int nDay, int nMonth, int nYear) : |
m_nDay(nDay), m_nMonth(nMonth), m_nYear(nYear) { |
} |
; |
// Unary increment operator (prefix) |
CDate& operator ++() { |
AddDays(1); |
return *this; |
} |
// postfix operator: differs from prefix in return-type and parameters |
CDate operator ++(int) { |
// Create a copy of the current object, before incrementing day |
CDate mReturnDate(m_nDay, m_nMonth, m_nYear); |
AddDays(1); |
// Return the state before increment was performed |
return mReturnDate; |
} |
void DisplayDate() { |
std::cout << m_nDay << " / " << m_nMonth << " / " << m_nYear; |
} |
}; |
int main() { |
// Instantiate and initialize a date object to 25 May 2008 |
CDate mDate(26, 11, 2012); |
std::cout << "The date object is initialized to: "; |
// Display initial date |
mDate.DisplayDate(); |
std::cout << std::endl; |
// Applying the prefix increment operator |
++mDate; |
std::cout << "Date after prefix-increment is: "; |
// Display date after incrementing |
mDate.DisplayDate(); |
std::cout << std::endl; |
return 0; |
} |
