求编一个C语言程序,除4、100、400来求是闰年还是平年,开始条件已经定了...答:include <stdio.h> include<conio.h> int day_of_year(int year,int month,int day);int month_day(int year,int day,int *pmonth,int *pday);static char pdata[][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 ...