一个好东东，输入年，月，日，求星期

[blue_coco]

这可是一个博士研究的。

if( 3 > Month )
{
Month += 12;
Year--;
}

Week = ( Day+2*Month+3*(Month+1 )/5+Year+Year/4-Year/100+Year/400 )%7;

[fangrk]

int dayOfWeek(int year,int month,int day)
{ static int _month[12]={31,0,31,30,31,30,31,31,
30,31,30,31};
if(year%4==0 && year%100!=0 || year%400==0)
_month[1]=29;
else _month[1]=28;
int C=0;
for(int i=0;i<month-1;++i)
C+=_month[i];
C+=day;
int S=year-1+(year-1)/4-(year-1)/100+(year-1)/400+C;
return S%7;
}