计算具体某天是星期几

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#include <iostream>#include <string.h>using namespace std;#define ISYEAR(x) x%100!=0&&x%4==0||x%400==0?1:0int 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][ISYEAR(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",    "October",    "November",    "December",};char weekName[7][20]={    "Sunday",    "Monday",    "Tuesday",    "Wednesday",    "Thursday",    "Friday",    "Saturday",};int main(){    Date tmp;    int cnt=0;    tmp.Day=1;    tmp.Month=1;    tmp.Year=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) {        for(m=1;m<=12;m++){            if(strcmp(s,monthName[m])==0){                break;            }        }        int days=buf[y][m][d]-buf[2012][7][16];        days+=1;        puts(weekName[(days%7+7)%7]);    }    return 0;}

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