#include <stdio.h>

      void panduan(int year,int month,int day);
   
    int main ()
    {
                printf("---------输入年月日，计算星期几！---------\n\n\n");
        while(1)
        {
            while(1)
            {
                int year,month,day;
                int y,m,d,c,s,w;
                int i=0;
                printf("请输入年月日（示例：2016 3 15）：");
                scanf("%d %d %d",&year,&month,&day);
                printf("\n");
               
                y=year;m=month;d=day;
               
                if(panduan(y,m,d))
                {
                    printf("日期不存在！请重新输入！\n\n");break;
                 }
                 
        
                 
                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 (y%100==0) {if (y%400==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;
               
                printf("\n");
                switch (w)
                {
                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;
                    
                }
                printf("\n\n");
            }   
        }
        
        return 0;
    }





    void panduan(int year,int month,int day)
    {
        int i;
        if(year<=0)
        {
            i=1;
        }
        
        if(month==1||month==3||month==5||month==7||month==8||month==10||month==12)
        {
            if(day<=0||day>31)
            {
                i=1;
            }
        }else if(month==4||month==6||month==9||month==11)
        {
            if(day<=0||day>30)
            {
                i=1;
            }
        }else if(month==2)
        {
            if(day%4==0&&day%100!=0)
            {
                if(day<=0||day>29)
                {
                    i=1;
                }
            }else
            {
                if(day<=0||day>28)
                {
                    i=1;
                }
            }
            
        }else
        {
            i=1;
        }
        return i;
        
    }