#include <iostream>
#include <iomanip>
#include <math.h>
using namespace std;
void printmonth(int m);
void printhead(int m);
int daysofmonth(int m);
int firstday(int y);
int year,weekday;
int main()
{
int i;
cout<<"请输入您要查询的年份：";
cin>>year;
weekday = firstday(year);
cout<<endl<<endl;
cout<<" "<<year<<"年"<<endl;
for(i=1;i<=12;++i)
{
printmonth(i);
cout<<endl;
}
cout<<endl<<endl;
return 0;
}
void printmonth(int m) //打印每月日历 //重点！mvp！
{
int i ,days;
printhead(m);
days=daysofmonth(m);
for(i=1;i<=days;i++)
{
cout<<setw(8)<<i;
weekday = (weekday+1)%7;
if(weekday == 0)
cout<<endl;
}
}
void printhead(int m) //打印每月的日历头（判定起始位置）
{
int i;
cout<<endl<<m<<"月 日 一 二 三 四 五 六"<<endl;//每个字隔6个空格，每个字相当于2个空格
for(i=0;i<weekday;++i)
cout<<" "; //共8个空格。
}
int firstday(int y) //判断某年元旦是星期几
{
double s;
s = floor((double)(year-1 + (year-1)/4 - (year-1)/100 + (year-1)/400 + 1));
return (int)s%7;
}
int daysofmonth(int m) //每月的天数
{
switch(m)
{
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
return 31;
case 4:
case 6:
case 9:
case 11:
return 30;
case 2:
if ( (year%4==0 && year%100!=0 )|| (year%400 == 0) )
return 29;
else
return 28;
default:
return 0;
}
}
