日历问题

//日历问题 
#include<stdio.h>

int type(int i);
char week[7][10]={"Saturday","Sunday","Monday","Tuesday","Wednesday","Thursday","Friday"};
int year[2]={365,366};
int month[2][12]={31,28,31,30,31,30,31,31,30,21,30,31,31,29,31,30,31,30,31,31,30,21,30,31};
int main()
{
	int days,dayofweek;
	int i,j;
	while(scanf("%d",&days)&&days!=-1)
	{
		dayofweek=days%7;
		for(i=2000;days>=year[type(i)];i++)
			days-=year[type(i)];
		for(j=0;days>=month[type(i)][j];j++)
			days-=month[type(i)][j];
		printf("%d-%02d-%02d %s\n",i,j+1,days+1,week[dayofweek]);
	}
	return 0;
}
int type(int i)
{
	if(i%4!=0||(i%100==0&&i%400!=0))
		return 0;
	else 
		return 1;
}