我这个哪里错了?看了半天就是看不出来。求救
#include <stdio.h>
int main()
{
/* 定义需要计算的日期 */
int year = 2008;
int month = 8;
int day = 8;
int sum,flag;
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("There is only 12 months in a year.");break;
}
sum+=day;
if(year%4==0)
flag=1;
else
flag=0;
if(flag==1&&month>2)
sum+=1;
printf("2008年8月8日是该年的第%d天",sum);
return 0;
}