C语言用递归算法,实现从键盘输入年月日,计算出是该年的第几天答:31};if(year%4==0&&year%100||year%400==0)a[2]=29;if(month==1) s+=day;else s+=a[month]+fun(year,month-1,day);return s;}void main(){int year,month,day;scanf("%d-%d-%d",&year,&month,&day);printf("%d年的第%d天",year,fun(year,month,day));}//运行示例: