【王道九度OJ】1043 day of week

#include<stdio.h>//start at 2014/08/24  20 :03
#include<string.h>
#define ISLEAPYEAR(x) x%4 == 0 && x%100 != 0 || x% 400== 0 ? 1 : 0
int dayOfMonth[13][2]={
    0,0,
   31,31,
	28,29,
	31,31,
	30,30,
	31,31,
	30,30,
	31,31,
	31,31,
	30,30,
	31,31,
	30,30,
	31,31
};
struct Date{
int Day;
int Month;
int Year;
void nextDay()
 {
	 Day++;
	 if( Day > dayOfMonth[Month][ISLEAPYEAR(Year)]  ){
	       Day=1;
		   Month++;
		   if( Month > 12){
			   Month = 1;
			   Year++;
		   }
	 }
 }
};
int buf[3001][13][32];
char monthName[13][20]={
" ",
"January",
"February",
"March",
"April",
"May",
"June",
"July",
"August",
"September",
"November",
"December"
};
char weekName[7][20]={
	"Sunday",
	"Monday",
	"Tuesday",
	"Wednesday",
	"Thursday",
	"Friday",
	"Saturday"
};
int main(){
 Date tmp;
 tmp.Day = 1;
 tmp.Month = 1;
 tmp.Year = 0;
 int cnt = 0;
 while( tmp.Year != 3001 ){
	 buf[tmp.Year][tmp.Month][tmp.Day] = cnt;
	 tmp.nextDay();
	 cnt++;
  }
 int d,m,y;
 char s[20];
 while( scanf("%d%s%d", &d, s, &y) != EOF ) //这里输入字符串 %s  开始写成s 了  太大意啦！！！
 {
	 for( m=1; m<13; m++)
	 {
		 if( strcmp(s , monthName[m]) ==0 )
		 {//注意这里要用字符串比较函数~！！
               break;		 
		 }
	 }
	 int days = buf[y][m][d] - buf[2012][7][16];//计算与今天日期的时间间隔
     days += 1;// 今天是星期日，对应数组下标0，所以加0 。
	 puts(weekName[ (days%7+7)%7 ]);//不知道为什么结果是错误的。暂时用这个错误的公式 往后递推了一下下。
 }
 return 0;
}