杭电2005 第几天？（switch-case）

#include "stdio.h" int main() { int year,month,day,sum,leap; //printf("\nplease input year,month,day\n"); while(scanf("%d/%d/%d",&year,&month,&day)!=EOF) { switch(month) { 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+=day; if(year%400==0||(year%4==0&&year%100!=0)) leap=1; else leap=0; if(1==leap&&month>2) sum++; printf("%d\n",sum); } }