#include <stdio.h> int isLeapyear(year){ if(((year%4==0)&&(year%100!=0)) || (year%400==0)){ return 1; }else{ return 0; } } int is_today(int year, int month, int day){ int month_days[13] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; int days = 0; // 月 for(int i=0; i<month; i...