#include<stdio.h>
void main()
{
int day,month,year,sum,leap,s;
printf("\nplease input year,month,day\n");
scanf("%d,%d,%d",&year,&month,&day);
switch(month)
{
case 1:sum=0;break;
case 2:sum=31;break;
case 3:sum=59;break;
case 4:sum=90;break;
case 5:sum=120;break;
case 6:sum=151;break;
case 7:sum=181;break;
case 8:sum=212;break;
case 9:sum=243;break;
case 10:sum=273;break;
case 11:sum=304;break;
case 12:sum=334;break;
default:printf("data error\n");break;
}
sum=sum+day;
if(year%400==0||(year%4==0&&year%100!=0))
leap=1;
else leap=0;
if(leap==1&&month>2)
sum++;
for(year=1900;;year++)
{
s=(year-1900+1)*365+(year-1)/4+(year-1)/100+(year-1)/400;
s+=sum;
}
if(s%7==1) printf("The day is Monday\n");
if(s%7==2) printf("The day is Tuesday\n");
if(s%7==3) printf("The day is Wednesday\n");
if(s%7==4) printf("The day is Thursday\n");
if(s%7==5) printf("The day is Friday\n");
if(s%7==6) printf("The day is Saturday\n");
if(s%7==0) printf("The day is Sunday\n");
}
这个死循环解决了,但是还有个问题,就是那个闰年个数不对
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