判断第几天！

#include<stdio.h>

int yue1[12]={31,28,31,30,31,30,31,31,30,31,30,31};

 int yue2[12]={31,29,31,30,31,30,31,31,30,31,30,31};

int main()

{   int f(int year,int month,int date);

    int a1,a2,a3;

    while(scanf("%d/%d/%d",&a1,&a2,&a3)!=EOF){

        f(a1,a2,a3);

    }

return 0;

}

int f(int year,int month,int date)

{

    int i=0;

if ((year%4==0&&year%100!=0)||year%400==0) 

    if(month>1)

    for(i=0;i<month-1;i++)

        date=date+yue2[i];

    else

        date=date;

else

    if(month>1)

        for(i=0;i<month-1;i++)

        date=date+yue1[i];

  else 

        date=date;

      printf("%d\n",date);

        return 0;

}