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


运行后在每个case语句后都会提示：C:\Users\LHM\Desktop\SevenDays\day.C(18) : error C2018: unknown character '0xa1'

哪位大虾帮忙解释一下