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/* Note:Your choice is C IDE */
#include "stdio.h"
void main()
{int sum_day(int,int);
 int leap(int year);
 int year,month,day,days;
 printf("input date(year,month,day):");
 scanf("%d,%d,%d",&year,&month,&day);
 printf("%d/%d/%d/",year,month,day);
 days=sum_day(month,day);
 if(leap(year)&&month>=3)
    days=days+1;
 printf("is the %dth day in this year.\n",days);
  printf("2013304143\n");
}

int sum_day(int month,int day)
   {int day_tab[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
    int i;
    for (i=1;i         day+=day_tab[i];
    return(day);
   }
  
int leap(int year)
  {int leap;
   leap=year%4==0&&year%100!=0||year%400==0;
   return(leap);
  }
 

总结：C程序内容比较多，而且容易出错，很考验人的眼力以及脑力,在程序输入的时候一定要细心。还有在敲代码的时候，思路一定要清晰，逻辑要好。程序运行出现问题时，要耐心多调试几次