#include <stdio.h>
int main()
{ /*输入年月日判断这是一年中的第几天.*/
int year,month,day,sum,leap;
printf("please input year month day\n");
scanf("%d %d %d",&year,&month,&day);
switch(month)
{
case 1:sum=0;break;
case 2:sum=31;break;
case 3:sum=59;break;
case 4:sum=90;break;
case 5:sum=120;break;
case 6:sum=151;break;
case 7:sum=181;break;
case 8:sum=212;break;
case 9:sum=243;break;
case 10:sum=273;break;
case 11:sum=304;break;
case 12:sum=334;break;
defaut:printf("data error.\n");
}
if(year%400==0||(year%4==0&&year%100!=0))
leap=1;
else
leap=0;
if(1==leap&&month>3)
sum++;
printf("it is the %dth day\n",sum+day);
getch();
return 0;
}