参考答案：#include <stdio.h>void split_date(int day_of_year, int year, int *month, int *day) {    int days_of_month[12]={31,28,31,30,31,30,31,31,30,31,30,31};    int m;    if ((year%4==0 && year%100!=0)||(year%400==0)) days_of_month[1]=29;    if ((days_of_month[1]==28 && (day_of_year<1 || 365<day_of_year))      ||(days_of_month[1]==29 && (day_of_year<1 || 366<day_of_year))) {        printf("Invalid day_of_year==%d,year==%d! ",day_of_year,year);        ...