第一逗號錯了。

printf("%d年%d月%d日是該年的第%d天\n"，/*這里逗號錯了改為“,”*/year,month,day,j);

第二漏了代碼

????return?o;
}

改正代碼為

#include?<stdio.h>
int?main()?
{?
????int?year?=?2008;
????int?month?=?8;
????int?day?=?8;
????int?j;

????switch(month)
????{
????case?1:j=day;break;
????
????case?2:j=31+day;break;
????case?3:j=31+28+day;break;
????case?4:j=31+28+31+day;break;
????case?5:j=31+28+31+30+day;break;
????case?6:j=31+28+31+30+31+day;break;
????case?7:j=31+28+31+30+31+30+day;break;
????case?8:j=31+28+31+30+31+30+31+day;break;
????case?9:j=31+28+31+30+31+30+31+31+day;break;
????case?10:j=31+28+31+30+31+30+31+31+30+day;break;
????case?11:j=31+28+31+30+31+30+31+31+30+31+day;break;
????case?12:j=31+28+31+30+31+30+31+31+30+31+30+day;break;
????}
????if(year%100==0&&year%400==0||(year%100!=0&&year%4==0))
????{
????????j=j+1;
????????
????}
????else
????{
????????j=j+0;
????????
????}
????printf("%d年%d月%d日是該年的第%d天\n",year,month,day,j);
????return?0;
}

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if(year%100==0&&year%400==0||(year%100!=0&&year%4==0))
????{
????????j=j-2;
????????
????}
????else
????{
????????j=j-3;
????????
????}