我 这段代码怎么错了（百度了一下说我有中文乱码？我没找到啊...）

Question

#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 ;    switch (month)    {    if (year%100==0&&year%400==0||year%4==0&&year%100!=0)    {         case 1 : sum = 0  + day ;        printf("%d年%d月%d日是第%d天"，year，month,day,sum);break;        case 2 : sum = 31 + day ;         printf("%d年%d月%d日是第%d天"，year，month,day,sum);break;        case 3 : sum = 31 + 29 + day ;         printf("%d年%d月%d日是第%d天"，year，month,day,sum);break;        case 4 : sum = 31 + 29 + 31 + day ;        printf("%d年%d月%d日是第%d天"，year，month,day,sum);break;        case 5 : sum = 31 + 29 + 31 + 30 day ;        printf("%d年%d月%d日是第%d天"，year，month,day,sum);break;        case 6 : sum = 31 + 29 + 31 + 30 + 31 +day ;         printf("%d年%d月%d日是第%d天"，year，month,day,sum);break;        case 7 : sum = 31 + 29 + 31 + 30 + 31 + 30  day ;        printf("%d年%d月%d日是第%d天"，year，month,day,sum);break;        case 8 : sum = 31 + 29 + 31 + 30 + 31 + 30 + 31 + day ;         printf("%d年%d月%d日是第%d天"，year，month,day,sum);break;        case 9 : sum = 31 + 29 + 31 + 30 + 31 + 30 + 31 + 31  + day ;        printf("%d年%d月%d日是第%d天"，year，month,day,sum);break;        case 10: sum = 31 + 29 + 31 + 30 + 31 + 30 + 31 + 31  + 30 + day ;         printf("%d年%d月%d日是第%d天"，year，month,day,sum);break;        case 11: sum = 31 + 29 + 31 + 30 + 31 + 30 + 31 + 31  + 30 + 31 + day ;         printf("%d年%d月%d日是第%d天"，year，month,day,sum);break;        case 12: sum = 31 + 29 + 31 + 30 + 31 + 30 + 31 + 31  + 30 + 31 + 31 + day ;         printf("%d年%d月%d日是第%d天"，year，month,day,sum);break;                    }        else     {        case 1 : sum = 0  + day ;        printf("%d年%d月%d日是第%d天"，year，month,day,sum);break;        case 2 : sum = 31 + day ;         printf("%d年%d月%d日是第%d天"，year，month,day,sum);break;        case 3 : sum = 31 + 28 + day ;        printf("%d年%d月%d日是第%d天"，year，month,day,sum);break;        case 4 : sum = 31 + 28 + 31 + day ;        printf("%d年%d月%d日是第%d天"，year，month,day,sum);break;        case 5 : sum = 31 + 28 + 31 + 30 day ;         printf("%d年%d月%d日是第%d天"，year，month,day,sum);break;        case 6 : sum = 31 + 28 + 31 + 30 + 31 +day ;         printf("%d年%d月%d日是第%d天"，year，month,day,sum);break;        case 7 : sum = 31 + 28 + 31 + 30 + 31 + 30  day ;        printf("%d年%d月%d日是第%d天"，year，month,day,sum);break;        case 8 : sum = 31 + 28 + 31 + 30 + 31 + 30 + 31 + day ;         printf("%d年%d月%d日是第%d天"，year，month,day,sum);break;        case 9 : sum = 31 + 28 + 31 + 30 + 31 + 30 + 31 + 31  + day ;         printf("%d年%d月%d日是第%d天"，year，month,day,sum);break;        case 10: sum = 31 + 28 + 31 + 30 + 31 + 30 + 31 + 31  + 30 + day ;        printf("%d年%d月%d日是第%d天"，year，month,day,sum);break;        case 11: sum = 31 + 28 + 31 + 30 + 31 + 30 + 31 + 31  + 30 + 31 + day ;        printf("%d年%d月%d日是第%d天"，year，month,day,sum);break;        case 12: sum = 31 + 28 + 31 + 30 + 31 + 30 + 31 + 31  + 30 + 31 + 31 + day ;         printf("%d年%d月%d日是第%d天"，year，month,day,sum);break;               }        } return 0;}

Answer 1

有几行day前面没加号