#include <stdio.h>#include <stdlib.h>struct Calendar{ int year; int month; int day;};int Leap_year(int y){//判断你否是闰年,闰年返回1,否则返回0. int run=0; if((y%4==0)&&(y%400==0)) run=1; else if(y%4==0) run=1; else ; return run;}int Fed_days(int y){//确定二月的天数。 int days=28; if(Leap_year(y)) days=29; e...