程序代码：

#include<stdio.h>
main()
{
int year,month,day;
int DAY;
scanf("%d,%d,%d",&year,&month,&day);
month=month-1;
switch(month)
{case 12:;
case 11:DAY+=30;
case 10:DAY+=31;
case 9:DAY+=30;
case 8:DAY+=31;
case 7:DAY+=31;
case 6:DAY+=30;
case 5:DAY+=31;
case 4:DAY+=30;
case 3:DAY+=31;
case 2:
DAY=(year%4==0&&year%100!=0||year%400==0)?(DAY+29):(DAY+28);
case 1:DAY+=31;break;
default:printf("error\n");
}
DAY=DAY+day;
printf("%5d",DAY);
}
请问我这个错在那俩