/* * UVA_602.cpp * * Created on: 2013年10月25日 * Author: Administrator */#include <iostream>#include <cstdio>using namespace std;//星期数组const char wstr[][20]={"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"};//月份数组const char mstr[][20]={"","January","February","March","April","May","June","July","August","September","October","November","December"};//判断是否是闰年bool isLeap(int year , bool old = false){if(old){//旧的的判断规则return (year%4 == 0) ? true : false;}//新的判断规则return (year%100 == 0)?(year%400 == 0?true:false):(year%4 == 0?true : false);}//求year年有多少天。。这时候需要判断一下他是旧历的年份还是心里的年份。因为2中日期系统的闰年的判断方法不一样int days_of_year(int year , bool old){return isLeap(year,old)?366:365;}//求year年的month月有多少天..在这里心里和旧历的月份的天数的规定是一样的int days_of_month(int month,int year , bool leap){if(month == 2){return leap?29:28;}int d;switch(month){case 1:case 3:case 5:case 7:case 8:case 10:case 12:d = 31;break;default:d = 30;}return d;}//判断year年的month月的day是否使用的是旧历bool isOld(int year,int month,int day){if(year < 1752 || (year == 1752 && month < 9) || (year == 1752 && month == 9 && day <=2)){return true;}return false;}//判断一个日期是否有效bool isValid(int year,int month , int day , bool old){if(year < 1){return false;}if(month < 1 || month > 12){return false;}if(day < 1 || day > days_of_month(month,year,isLeap(year,old))){return false;}if(year == 1752 && month == 9 && day>=3 && day<= 13){return false;}return true;}int main(){int month ,day,year;while(scanf("%d%d%d",&month,&day,&year)!=EOF,month||day||year){bool old = isOld(year,month,day);if(!isValid(year,month,day,old)){cout<<month<<"/"<<day<<"/"<<year<<" is an invalid date."<<endl;}else{int yy,mm;int sum = 0;//两个不同的日期系统的转换关键在于天数的计算。。for(yy = 1 ; yy < year ; ++yy){sum += days_of_year(yy,old);}for(mm = 1 ; mm < month ; ++mm){sum += days_of_month(mm,year,isLeap(year,old));}sum +=day;int week = sum % 7;if(old){week = (week+5)%7;}cout<<mstr[month]<<" "<<day<<", "<<year<<" is a "<<wstr[week]<<endl;}}return 0;}
