输入某年某月某日,判断这一天是这一年的第几天?

#include
 int 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);
}

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