*/ --------------------------------------------------------------------------------------
*/ 出自： 编程中国 http://www.bc-cn.net
*/ 作者： 李飞龙 QQ：81516156
*/ 时间： 2007-9-18 编程论坛首发
*/ 声明： 尊重作者劳动，转载请保留本段文字
*/ --------------------------------------------------------------------------------------
main()
{static int day_tab[][13]={
{0,31,28,31,30,31,30,31,31,30,31,30,31},
{0.31,29,31,30,31,30,31,31,30,31,30,31}};
printf("%d\n",day_of_year(day_tab,2007,100));
}
day_of_year(day_tab,year,yearday,pmonth,pday)
int year,yearday,*pmonth,*pday;
{
int i,leap,q;
leap=(year%4==0&&year%100||year%400==0);
for(i=1;yearday>(q=*(*(day_tab+leap)+i));i++)
yearday-=q;
*pmonth=i;
*pday=yearday;
}

实在不知道哪儿错了？
望大侠指导一下！！！