日历制作
（1）输入年份和月份，显示年历和当月月历；（2）输入两个日期，计算这两个日期之间的相隔天数；
代码如下：#include<iostream>
#include<string>
#include<iomanip>
using namespace std ;
class Date;
bool IsLeapYear(unsigned y);
string SwitchMonth(unsigned m);
string SwitchWeek(unsigned w);
void PrintMonth(unsigned y,unsigned m);
void PrintYear(unsigned y);
void CountDown(unsigned y1,unsigned m1,unsigned d1,Date &date3);
ostream& operator<<(ostream &out,const Date &date);
class Date
{
public:
Date(unsigned m,unsigned d,unsigned y);
void Before(int n);
void After(int n);
long Distance(Date &date);
friend ostream& operator<<(ostream &out,const Date &date);
private:
unsigned week,month,day,year;
};
Date::Date(unsigned m,unsigned d,unsigned y)
{
unsigned i,total=0;
month=m;
day=d;
year=y;
for(i=1;i<year;i++)
{
if(IsLeapYear(i))
total+=366;
else
total+=365;
}
for(i=1;i<month;i++)
{
if(i==1||i==3||i==5||i==7||i==8||i==10||i==12)
total+=31;
else if(i==4||i==6||i==9||i==11)
total+=30;
else if(i==2&&IsLeapYear(year))
total+=29;
else
total+=28;
}
total+=day;
week=total%7;
}
void Date::Before(int n)
{
unsigned i,total=0;
for(i=n;i>0;i--)
{
day--;
if(day==0)
{
month--;
if(month==0)
{
year--;
month=12;
}
if(month==1||month==3||month==5||month==7||month==8||month==10||month==12)
day=31;
else if(month==4||month==6||month==9||month==11)
day=30;
else if(month==2)
{
if(IsLeapYear(year))
day=29;
else
day=28;
}
}
}
for(i=1;i<year;i++)
{
if(IsLeapYear(i))
total+=366;
else
total+=365;
}
for(i=1;i<month;i++)
{
if(i==1||i==3||i==5||i==7||i==8||i==10||i==12)
total+=31;
else if(i==4||i==6||i==9||i==11)
total+=30;
else if(i==2&&IsLeapYear(year))
total+=29;
else
total+=28;
}
total+=day;
week=total%7;
}
void Date::After(int n)
{
unsigned i,total=0;
for(i=n;i>0;i--)
{
day++;
if(day==29&&month==2&&!IsLeapYear(year))
{
month++;
day=1;
}
else if(day==30&&month==2)
{
month++;
day=1;
}
else if(day==31&&(month==4||month==6||month==9||month==11))
{
month++;
day=1;
}
else if(day==32)
{
month++;
day=1;
}
if(month==13)
{
year++;
month=1;
}
}
for(i=1;i<year;i++)
{
if(IsLeapYear(i))
total+=366;
else
total+=365;
}
for(i=1;i<month;i++)
{
if(i==1||i==3||i==5||i==7||i==8||i==10||i==12)
total+=31;
else if(i==4||i==6||i==9||i==11)
total+=30;
else if(i==2&&IsLeapYear(year))
total+=29;
else
total+=28;
}
total+=day;
week=total%7;
}
long Date::Distance(Date &date)
{
long n=0;
while(year<date.year)
{
day++;
n++;
if(day==29&&month==2&&!IsLeapYear(year))
{
month++;
day=1;
}
else if(day==30&&month==2)
{
month++;
day=1;
}
else if(day==31&&(month==4||month==6||month==9||month==11))
{
month++;
day=1;
}
else if(day==32)
{
month++;
day=1;
}
if(month==13)
{
year++;
month=1;
}
}
while(month<date.month)
{
day++;
n++;
if(day==29&&month==2&&!IsLeapYear(year))
{
month++;
day=1;
}
else if(day==30&&month==2)
{
month++;
day=1;
}
else if(day==31&&(month==4||month==6||month==9||month==11))
{
month++;
day=1;
}
else if(day==32)
{
month++;
day=1;
}
}
while(day<date.day)
{
day++;
n++;
}
if(year==date.year&&month==date.month&&day==date.day)
return n;
else return -1;
}
int main()
{
unsigned a,n;
unsigned y1,m1,d1,year,month;
while(1)
{
cout<<"****************** 万年历 ******************\n";
cout<<"\n";
cout<<"\n";
cout<<" (^_^) 请依次输入当前日期（按年、月、日）:";
cin>>y1>>m1>>d1;
Date date1(m1,d1,y1);
Date date2(m1,d1,y1);
Date date3(m1,d1,y1);
cout<<"请选择:\n*** 1.查询N天之前的日期;\n"
<<"*M* 2.查询N天之后的日期;\n"
<<"*E* 3.查询未来某一天距今天的日子;\n"
<<"*N* 4.月历查询;\n"
<<"*U* 5.年历查询;\n"
<<"*** 6.退出查询.\n";
cin>>a;
switch(a)
{
case 1:
cout<<"请输入天数 :";
cin>>n;
date1.Before(n);
cout<<"日期是:";
cout<<date1;
break;
case 2:
cout<<"请输入天数 :";
cin>>n;
date2.After(n);
cout<<"日期是:";
cout<<date2;
break;
case 3:
CountDown(y1,m1,d1,date3);
break;
case 4:
cout<<"请依次输入年份和月份:";
cin>>year>>month;
PrintMonth(year,month);
break;
case 5:
cout<<"请输入年份:";
cin>>year;
PrintYear(year);
break;
case 6:
cout<<"欢迎使用该系统! \n"<<endl;
exit(0);
}
}
return 0;
}
bool IsLeapYear(unsigned y)
{
return y%4==0&&y%100!=0||(y%400==0);
}
string SwitchMonth(unsigned m)
{
switch(m)
{
case 1:
return "一月";
break;
case 2:
return "二月";
break;
case 3:
return "三月";
break;
case 4:
return "四月";
break;
case 5:
return "五月";
break;
case 6:
return "六月";
break;
case 7:
return "七月";
break;
case 8:
return "八月";
break;
case 9:
return "九月";
break;
case 10:
return "十月";
break;
case 11:
return "十一月";
break;
case 12:
return "十二月";
break;
default:
return 0;
}
}
string SwitchWeek(unsigned w)
{
switch(w)
{
case 0:
return "星期日";
break;
case 1:
return "星期一";
break;
case 2:
return "星期二";
break;
case 3:
return "星期三";
break;
case 4:
return "星期四";
break;
case 5:
return "星期五";
break;
case 6:
return "星期六";
break;
default:
return 0;
}
}
void PrintMonth(unsigned y,unsigned m)
{
unsigned week,i,k,n,total=0;
for(i=1;i<y;i++)
{
if(IsLeapYear(i))
total+=366;
else
total+=365;
}
for(i=1;i<m;i++)
{
if(i==1||i==3||i==5||i==7||i==8||i==10||i==12)
total+=31;
else if(i==4||i==6||i==9||i==11)
total+=30;
else if(i==2&&IsLeapYear(y))
total+=29;
else
total+=28;
}
total+=1;
week=total%7;
switch(m)
{
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
n=31;
break;
case 4:
case 6:
case 9:
case 11:
n=30;
break;
case 2:
if(IsLeapYear(y))
n=29;
else
n=28;
}
string s[7]={"Sun","Mon","Tue","Wed","Thu","Fri","Sat"};
cout<<"*** "<<y<<" "<<SwitchMonth(m)<<" ***"<<endl;
for(i=0;i<7;i++)
cout<<setw(5)<<s[i];
cout<<'\n';
for(i=0;i<week;i++)
cout<<setw(5)<<' ';
for(i=1;i<=n;i++)
{
cout<<setw(5)<<i;
k=(week+i)%7;
if(!k)
cout<<'\n';
}
cout<<'\n';
}
void PrintYear(unsigned y)
{
int i;
for(i=1;i<=12;i++)
PrintMonth(y,i);
}
void CountDown(unsigned y1,unsigned m1,unsigned d1,Date &date3)
{
unsigned y2,m2,d2;
Loop:cout<<"请输入未来某一日期（按年、月、日） :";
cin>>y2>>m2>>d2;
Date date4(m2,d2,y2);
if(y2<y1||(y2==y1&&m2<m1)||(y2==y1&&m2==m1&&d2<d1))
goto Loop;
cout<<"在两个日期间 "<<SwitchMonth(m1)<<" "<<d1<<" "<<y1<<" and "
<<SwitchMonth(m2)<<" "<<d2<<" "<<y2<<" 相隔天数是 :"<<date3.Distance(date4)<<endl;
}
ostream& operator<<(ostream &out,const Date &date)
{
out<<" "<<date.year<<"年"<<" "<<SwitchMonth(date.month)<<" "<<date.day<<"日"<<" "<<SwitchWeek(date.week)<<endl;
return out;
}
初学c++。。。。