#include "stdio.h"#include "stdlib.h"#include "string.h"static char daytab[2][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}};int day_of_year(int year,int month,int day){    int leap;    char *p;    leap = ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0);    p = daytab[leap];    while(--month)        day += *++p;    return day;}void month_day(int year,int yearday,int *pmonth,int *pday){    int leap;    char *p;    leap = ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0);    p = daytab[leap];    while(yearday > *++p)        yearday -= *p;    *pmonth = p - *(daytab + leap);    *pday = yearday;}int main(){    int n;    int month = 0,day = 0;    int *pmonth = &month,*pday = &day;    n = day_of_year(2014,11,14);    printf("%d\n",n);    month_day(2014,318,pmonth,pday);    printf("%d %d",*pmonth,*pday);    return 0;}

*(daytab + leap) 表示的是地址。基础不牢啊，还想了半天。