#include <stdio.h>
#include <stdlib.h>
int statistic(int a)
{
int i,t=0;
for(i=1;i<a;i++)
if(i%4==0)
{
if(i%100!=0)
t++;
else if(i%400==0)
t++;
}
return (t);
}
int judge(int a)
{
int z;
if(a%4!=0) z=0;
else if(a%100!=0) z=1;
else if(a%400==0) z=1;
else z=0;
return (z);
}
void errorday()
{
printf("日输入错误\n\n");
system("PAUSE");
printf("\n");
}
void errormonth()
{
printf("月输入错误\n\n");
system("PAUSE");
printf("\n");
}
int main(int argc, char *argv[])
{
int year,month,day,ruen_time,y_n,i;
long days1,days2,days3,day_sum;
static int m[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
do
{
printf("请输入年、月、日:\n");
scanf("%d %d %d",&year,&month,&day);
y_n=judge(year);
if(month>12) {errormonth();continue;}
if(y_n==1)
{
if(month==2)
{if(day>29) {errorday();continue;}}
else if(day>m[month]) {errorday();continue;}
}
else if(day>m[month]) {errorday();continue;}
ruen_time=statistic(year);
days1=ruen_time+(year-1)*365;
days2=0;
for(i=0;i<month;i++)
days2=days2+m[i];
if(month>2)
days3=days2+y_n+day;
else days3=days2+day;
day_sum=days1+days3;
switch(day_sum%7)
{
case 0:printf("%d年%d月%d日是星期日\n",year,month,day);break;
case 1:printf("%d年%d月%d日是星期一\n",year,month,day);break;
case 2:printf("%d年%d月%d日是星期二\n",year,month,day);break;
case 3:printf("%d年%d月%d日是星期三\n",year,month,day);break;
case 4:printf("%d年%d月%d日是星期四\n",year,month,day);break;
case 5:printf("%d年%d月%d日是星期五\n",year,month,day);break;
case 6:printf("%d年%d月%d日是星期六\n",year,month,day);break;
default:break;
}
printf("\n");
system("PAUSE");printf("\n");
}
while(1);
}
