#include<stdio.h>
#include<math.h>
#include<stdlib.h>
#include<>

//                           每月天数 
#include<math.h>
int month_day(int year,int month)
{
	switch(month)
        {
            case 1:
            case 3:
            case 5:
            case 7:
            case 8:
            case 10:
            case 12:
            return 31;break;
            
            case 4:
            case 6:
            case 9:
            case 11:
            return 30;break; 

            case 2:
            	if((year%4==0)&&(year%100!=0)||(year%400==0))
            	{
            		return 29;
            		break;
				}
				else
				{
					return 28;
					break;
				}
		}
}


//                       年历
                                         
void year_calendar(int year)
{
	int month,days,weekday,sum_day;
	int i,j;
    
		year;
		printf("请输入要查询的年份：");
		scanf("%d",&year); 
	for(i=1;i<year;i++)
	{
		if((year%4==0)&&(year%100!=0)||(year%400==0))
		  sum_day+=366;
		else
		  sum_day+=365;	
	}
		for(month=1;month<=12;month++)
		{
		    printf("\n--------%d/%d--------\n",year,month);
            printf("SUN\tMON\tTUE\tWED\tTHU\tFRI\tSAT\t\n");
            i=1;
            j=1;
			weekday=sum_day%7;
			while(i<=weekday)              //开始位置前都是空格 
			{
				printf("\t");
				i++;
			}
			while(j<=month_day(year,month))
			{
				weekday=sum_day%7;
				if (weekday==6)
					printf("%d\n",j);
					
				else			
					printf("%d\t",j);	

				if(j==month_day(year,month))
				    printf("\n");
				
				j++;
				sum_day++;	
			}
		 } 
}


//                        月历 

void month_calendar(int year,int month)
{
	int sum_day=0,weekday,i,j,k;
	printf("请输入要查询的年/月：");
	scanf("%d/%d",&year,&month); 
	for(i=1;i<year;i++)
	{
		if((year%4==0)&&(year%100!=0)||(year%400==0))
		  sum_day+=366;
		else
		  sum_day+=365;	
	}
	for(k=1;k<month;k++)
	{
	    sum_day+=month_day(year,month);
	}

		    printf("\n--------%d/%d--------\n",year,month);
            printf("SUN\tMON\tTUE\tWED\tTHU\tFRI\tSAT\t\n");
            i=1;
            j=1;
			weekday=sum_day%7;
			while(i<=weekday)              //开始位置前都是空格 
			{
				printf("\t");
				i++;
			}
			while(j<=month_day(year,month))
			{
				weekday=sum_day%7;
				if (weekday==6)
					printf("%d\n",j);
					
				else			
					printf("%d\t",j);	

				if(j==month_day(year,month))
				    printf("\n");
				
				j++;
				sum_day++;	
			} 
}

//                                   距今多少天 

struct tm
{
	int tm_sec;
	int tm_min;
	int tm_hour;
	int tm_day;
	int tm_month;
	int tm_year;
	int tm_weekday;
	int tm_yearday;
}


int main(void)
{
	printf("\n-------------------选择服务-------------------\n\n");
	printf("                   1.年历显示\n");
	printf("                   2.月历显示\n");
	printf("                   3.日期查询\n");
	printf("                   4.距今多少天\n");
	printf("                   5.退出\n");
	printf("\n-------------------选择服务-------------------\n") ;
	
	int n,year,month,day;
	printf("请选择服务：");
	scanf("%d",&n);
	switch(n)
	{
		case 1:
			{
				year_calendar(year);
				break;
			}
		case 2:
			{
				month_calendar(year,month);
				break;
			}
	}
}