用蔡勒公式即可:
#include <stdio.h>
int main ()
{
int y, m, d, c, w;
printf ("输入年 月 日(空格间隔):");
scanf ("%d %d %d", &y, &m, &d);
if (m ==1 || m == 2)
{ //判断月份是否为1或2y--;m += 12;}
c = y / 100;
y = y - c * 100;
w = (c / 4) - 2 * c + (y + y / 4) + (13 * (m + 1) / 5) + d - 1;
while (w < 0) w += 7;
w %= 7;
if (w == 0) printf ("星期日");
else printf ("星期%d", w);
return 0;
}
方法二:
#include
void main ()
{
int y,m,d,c,s,w;
printf("请输入8位年月日,以空格隔开:");
scanf("%d%d%d",&y,&m,&d);
if (m==1) c=d;
else if (m==2) c=31 d;
else if (m==3) c=31 28 d;
else if (m==4) c=31 28 31 d;
else if (m==5) c=31 28 31 30 d;
else if (m==6) c=31 28 31 30 31 d;
else if (m==7) c=31 28 31 30 31 30 d;
else if (m==8) c=31 28 31 30 31 30 31 d;
else if (m==9) c=31 28 31 30 31 30 31 31 d;
else if (m==10) c=31 28 31 30 31 30 31 31 30 d;
else if (m==11) c=31 28 31 30 31 30 31 31 30 31 d;
else if (m==12) c=31 28 31 30 31 30 31 31 30 31 30 d;
if (m>2)
{if (y0==0) {if (y@0==0) c=c 1;}
else if (y%4==0) c=c 1;}
s=(y-1)*365 (y-1)/4-(y-1)/100 (y-1)/400 c;
w=s%7;
switch (w)
{
case 0: printf("星期日");break;
case 1: printf("星期一");break;
case 2: printf("星期二");break;
case 3: printf("星期三");break;
case 4: printf("星期四");break;
case 5: printf("星期五");break;
case 6: printf("星期六");break;
printf("");
}
}