#include "stdio.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.\n",sum);
  } 

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