#include<stdio.h> 
int year1(int y)
{
   if((y%4==0)&&(y%100!=0)||y%400==0)
      return 366;
   else
     return 365;
}
int main(void){ 
 int command;
   printf("|-----------欢迎使用------------|\n");
   printf("|1.查询对应的星期               |\n");
   printf("|2.判断是否为闰年               |\n");
   printf("|3.查询对应的日历               |\n");
   printf("|4.退出                         |\n");
   printf("|-------------------------------|\n");
    do{
 printf("请输入您选择的功能：");
 scanf("%d",&command); 
 switch(command)
 {
     case 1:
 	     int year,month,day,week;
         printf("请输入年月日(中间用空格分隔开):");
         scanf("%d%d%d",&year,&month,&day);
         if(month==1||month==2){
         month+=12;
         year--;}
         week=(day+2*month+3*(month+1)/5+year+year/4-year/100+year/400)%7;
         switch(week){
         case 0:
         printf("星期一\n");
         break;
         case 1:
         printf("星期二\n");
         break;
         case 2:
         printf("星期三\n");
         break; 
         case 3:
         printf("星期四\n");
         break;
         case 4:
         printf("星期五\n");
         break;
         case 5:
         printf("星期六\n");
         break;
         case 6:
         printf("星期日\n");
         break;  
         }
     break;
     case 2:
 	    int x;
         printf("请输入年份");
         scanf("%d",&x);
         if(x%4==0&&x%100!=0||x%400==0)
         printf("闰年\n");
         else
         printf("不是闰年\n");
         break;
     case 3:
     {
	 int y,i,j,sum=0,z;
     int begin,week;
     int days[12]={31,28,31,30,31,30,31,31,30,31,30,31};
     printf("请输入年份:");
      scanf("%d",&y);
      printf("1.单列输出 2.双列输出\n");
      printf("请输入:",z);
	  scanf("%d",&z) ;
	  if(z==1) 
	  for(i=1;i<y;i++)
	    sum+=year1(i);
	  week=(sum+1)%7;
     if(year1(y)==366)
	 days[1]=29;
     printf("\n%d年日历如下:\n\n",y);
     for(i=0;i<12;i++)
	 {
     printf("               %d月               \n",i+1);
	 printf("周日 周一 周二 周三 周四 周五 周六\n"); 
	 printf("==================================\n");
	 begin=1;
	 for(j=0;j<week;j++)
	     printf("");
	 while(begin<=days[i])
	 {
       printf("%5d",begin);
	   begin++;
	   week=(week+1)%7;
	   if(week%7==0)
	   printf("\n");
	   }
	 printf("\n\n");}
     break;}
     case 4:
       printf("感谢您的使用，再见");
	        break;
     default:
     printf("无此功能，请再次输入\n");}
	 }
    while(command!=4);  
 return 0;
}