C++实现日期类(Date类)的方法
如下所示：
#include<iostream>
usingnamespacestd;
classDate
{
public:
Date(intyear=1900,intmonth=1,intday=1)//构造
:_year(year)
,_month(month)
,_day(day)
{
if(!isInvalidDate(_year,_month,_day))
{
_year=1900;
_month=1;
_day=1;
}
}
Dateoperator+(intcount)
{
Datetmp(*this);
tmp._day+=count;
ToCorrect(tmp);
returntmp;
}
Dateoperator-(intcount)
{
Datetmp(*this);
tmp._day-=count;
ToCorrect(tmp);
returntmp;
}
Date&operator++()//前置++
{
(*this)++;
return*this;
}
Dateoperator++(int)//后置++
{
Datetmp(*this);
(*this)+=1;
returntmp;
}
Date&operator--()
{
(*this)--;
return*this;
}
Dateoperator--(int)
{
Datetmp(*this);
(*this)--;
returntmp;
}
intoperator-(constDate&d)
{
intflag=1;
Datemax=*this;
Datemin=d;
if(*this<d)
{
max=d;
min=*this;
flag=-1;
}
intcount=0;
while(min!=max)
{
++min;
count++;
}
returncount*flag;
}
Date&operator+=(intday)
{
*this=*this+day;
return*this;
}
booloperator!=(constDate&d)
{
return!(*this==d);
}
booloperator<(constDate&d)
{
return!((*this>d)||(*this==d));
}
booloperator>=(constDate&d)
{
return!(*this<d);
}
booloperator>(constDate&d)
{
return(_year>d._year
||(_year==d._year&&_month>d._month)
||(_year==d._year&&_month==d._month&&_day>d._day));
}
booloperator==(constDate&d)
{
return((_year==d._year)&&(_month==d._month)&&(_day==d._day));
}
public:
boolIsLeapYear(intyear)
{
if(year%400||(year%4&&year%100))
returntrue;
returnfalse;
}
intYearsOfMonth(intyear,intmonth)
{
intday;
intdays[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
day=days[month];
if(month==2)
day+=IsLeapYear(year);
returnday;
}
DateToCorrect(Date&d)
{
if(d._day>YearsOfMonth(d._year,d._month))
{
while(d._day>YearsOfMonth(d._year,d._month))
{
d._day-=YearsOfMonth(d._year,d._month);
if(d._month==12)
{
d._year++;
d._month=1;
}
else
{
++d._month;
}
}
}
else
{
while(d._day<=0)
{
if(d._month==1)
{
d._year--;
d._month=12;
}
else
{
--d._month;
}
d._day+=YearsOfMonth(d._year,d._month);
}
}
returnd;
}
boolisInvalidDate(intyear,intmonth,intday)
{
if((year<1)||(month<0||month>12)||(day<0||day>YearsOfMonth(year,month)))
returnfalse;
returntrue;
}
voidDisplay()
{
cout<<_year<<"-"<<_month<<"-"<<_day<<endl;
}
friendistream&operator>>(istream&is,Date&d);
friendostream&operator<<(ostream&os,constDate&d);
private:
int_year;
int_month;
int_day;
};
istream&operator>>(istream&is,Date&d)
{
cout<<"请输入一个日期"<<endl;
is>>d._year>>d._month>>d._day;
returnis;
}
ostream&operator<<(ostream&os,constDate&d)
{
cout<<d._year<<"-"<<d._month<<"-"<<d._day<<endl;
returnos;
}
intmain()
{
/*Dated1(2016,8,18);
//d1.Display();
//d1=d1++;
cout<<d1<<endl;*/
//Dated1(2015,12,3);
//(d1++).Display();//d1.operator++(&d1,0);
//(++d1).Display();//d1.operator++(&d1);
Dated1(2015,12,3);
Dated2(2015,11,1);
cout<<(d1-d2)<<endl;
//Dated1(2015,12,3);
//Dateret=d1+40;//operator+
//ret.Display();
/*Dated1(2015,12,3);
Dateret=d1+40;
d1=ret;
ret=d1-40;
ret.Display();*/
/*Dateret;
Dated2(2015,1,1);
ret=d2-1;
ret.Display();*/
return0;
}
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