#include "stdio.h"
#include "conio.h"
main()
{
  int day,month,year,sum,leap;
  printf("\nplease input year,month,day\n");
  scanf("%d,%d,%d",&year,&month,&day);
  switch(month) /*先计算某月以前月份的总天数*/
  {
    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;
    default:printf("data error");break;
  }
  sum=sum+day; /*再加上某天的天数*/
  if(year%400==0||(year%4==0&&year%100!=0)) /*判断是不是闰年*/
    leap=1;
  else
    leap=0;
  if(leap==1&&month>2) /*如果是闰年且月份大于2,总天数应该加一天*/
    sum++;
  printf("It is the %dth day.",sum);
  getch();
}

#include "stdio.h"
#include "conio.h"
main()
{
  int day,month,year,sum,leap;
  printf("\nplease input year,month,day\n");
  scanf("%d,%d,%d",&year,&month,&day);
  switch(month) /*先计算某月以前月份的总天数*/
  {
    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;
    default:printf("data error");break;
  }
  sum=sum+day; /*再加上某天的天数*/
  if(year%400==0||(year%4==0&&year%100!=0)) /*判断是不是闰年*/
    leap=1;
  else
    leap=0;
  if(leap==1&&month>2) /*如果是闰年且月份大于2,总天数应该加一天*/
    sum++;
  printf("It is the %dth day.",sum);
  getch();
}