代碼有點小問題首先你的printf哪一行可以看出來你的表點錯了 是中文的

其次是判斷應(yīng)該是被400整除||被4整除被400不整除

之后是sum可能剛開始要初始化為0

代碼如下

#include <stdio.h>
int main()
{
??? /* 定義需要計算的日期 */
??? int year = 2008;
??? int month = 8;
??? int day = 8;
??? int sum=0;
??? switch(month)
??? {
??????? case 1:
??????? sum+=0;
??????? break;
??case 2:
??sum+=31;
??????? break;
??case 3:
??sum+=28+31;
??????? break;
??case 4:
??sum+=31+28+31;
??break;
??? ?case 5:
??? ?sum+=30+31+28+31;
??????? break;
??case 6:
??sum+=31+30+31+28+31;
??break;
??case 7:
??sum+=30+31+30+31+28+31;
??????? break;
??case 8:
??sum+=31+30+31+30+31+28+31;
??????? break;
??case 9:
??sum+=31+31+30+31+30+31+28+31;
??????? break;
??case 10:
??sum+=30+31+31+30+31+30+31+28+31;
??????? break;
??case 11:
??sum+=31+30+31+31+30+31+30+31+28+31;
??????? break;
??case 12:
??sum+=30+31+30+31+31+30+31+30+31+28+31;
??break;

??? }
???
??? sum+=day;
??? if(year%400==0||(year%4==0&&year%100!=0))
??? {
??????? sum++;
??? }
??? else
??? {?
??????? sum+=0;
??? }
??????? printf("%d年%d月%d日是該年的第%d天",year,month,day,sum);
???
?
???
??? return 0;
}
???
???
???最后也謝謝你，我那個懶得寫了直接用的你的 哈哈