不知道是哪里错了，运行不了，求解

#include<stdio.h>

int main()

{

int year=2008;

int month=8;

int day=8;

int sum,flag;

swich(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(一年当中只有12个月"");break;

}

sum=sum+day;

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

flag=1;

else

flag=0;

if(flag==1&&month>2)

sum++;

printf("%d年%月%日是该年%d天",year,month,day,sum);

return 0;

}