#include <iostream> #include <vector> #include <string> using namespace std; class CDate{ public: CDate(); CDate (int year,int month,int day); CDate& operator ++(); CDate operator ++(int); CDate operator+(long days) const; CDate operator-(long days) const; long operator -(const CDate& rhs) const; int WeekDay() const; static int IsLeapYear(int year); friend ostream& operator <<(ostream& out,const CDate& d); friend istream& operator >>(istream& in, CDate& d); int getmonthday(); bool operator>(const CDate& d) const; private: int m_year,m_month,m_day; }; /* 请在这里填写答案 */ int main(int argc, char** argv) { vector<string> w={"SUN","MON","TUE","WEN","THU","FRI","SAT"}; CDate d1; int n; cin>>d1; cout<<d1<<endl; cout<<w[d1.WeekDay()]<<endl; cin>>n; CDate d2=d1+n; cout<<w[d2.WeekDay()]<<endl; ++d2; cout<<d2<<endl; d2++; cout<<d2<<endl; cout<<d2-d1<<endl; // cout<<d2-d1<<endl; return 0; }

以下是填空部分的答案： ```c++ CDate::CDate() { time_t t = time(NULL); struct tm* now = localtime(&t); m_year = now->tm_year + 1900; m_month = now->tm_mon + 1; m_day = now->tm_mday; } CDate::CDate(int year, int month, int day) : m_year(year), m_month(month), m_day(day) {} CDate& CDate::operator++() { if (m_day == getmonthday()) { m_day = 1; if (m_month == 12) { m_year++; m_month = 1; } else { m_month++; } } else { m_day++; } return *this; } CDate CDate::operator++(int) { CDate tmp(*this); operator++(); return tmp; } CDate CDate::operator+(long days) const { CDate tmp(*this); if (days >= 0) { for (long i = 0; i < days; i++) { ++tmp; } } else { for (long i = 0; i > days; i--) { --tmp; } } return tmp; } CDate CDate::operator-(long days) const { return operator+(-days); } long CDate::operator-(const CDate& rhs) const { struct tm t1 = {0}, t2 = {0}; t1.tm_year = m_year - 1900; t1.tm_mon = m_month - 1; t1.tm_mday = m_day; t2.tm_year = rhs.m_year - 1900; t2.tm_mon = rhs.m_month - 1; t2.tm_mday = rhs.m_day; time_t time1 = mktime(&t1); time_t time2 = mktime(&t2); return (time1 - time2) / (24 * 60 * 60); } int CDate::WeekDay() const { struct tm t = {0}; t.tm_year = m_year - 1900; t.tm_mon = m_month - 1; t.tm_mday = m_day; mktime(&t); return t.tm_wday; } int CDate::IsLeapYear(int year) { if (year % 400 == 0 || (year % 4 == 0 && year % 100 != 0)) { return 1; } else { return 0; } } int CDate::getmonthday() { int days[] = {31, 28 + IsLeapYear(m_year), 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; return days[m_month - 1]; } bool CDate::operator>(const CDate& d) const { if (m_year > d.m_year) { return true; } else if (m_year < d.m_year) { return false; } else { if (m_month > d.m_month) { return true; } else if (m_month < d.m_month) { return false; } else { if (m_day > d.m_day) { return true; } else { return false; } } } } ostream& operator<<(ostream& out, const CDate& d) { out << d.m_year << "-" << d.m_month << "-" << d.m_day; return out; } istream& operator>>(istream& in, CDate& d) { in >> d.m_year >> d.m_month >> d.m_day; return in; } ```