从键盘输入年、月、日，输出它是当年的第几天

#include struct date {int y,m,d;};

int fun(struct date *p) {int a=0;

switch(p->m) {case 12:a+=30; case 11:a+=31; case 10:a+=30; case 9:a+=31; case 8:a+=31; case 7:a+=30; case 6:a+=31; case 5:a+=30; case 4:a+=31;

case 3:if(p->y%4==0&&p->y0!=0||p->y@0==0) a+=29;else a+=28; case 2:a+=31; case 1:a+=p->d; }

return a; }

void main()

{struct date d,*pd; int i,a,b; pd=&d;

printf(\以yy.mm.dd的格式输入一个日期\\n\

scanf(\ i=fun(pd);

printf(\是该年的第%d天\\n\}