C语言实现万年历

#include   
#include   
#include   
#include  
typedef struct today  
{  
    int day;  
    int month;  
    int year;  
} today;  
  
int day_cankao[2][13]={  
    {0,31,28,31,30,31,30,31,31,30,31,30,31},  
    {0,31,29,31,30,31,30,31,31,30,31,30,31}  
};  
char *week[]=  
{  
    "Sun","Mon","Tue","Wen","Thu","Fir","Sat"  
};  
struct tm *todayuse;//struct tm定义c语言中time的结构体  
today today_current;  
int getweekday(today today_usenow)  
{  
    // w = y + [y/4] + [ c/4 ] – 2c+ [13 * (m+1) / 5] + d – 1  
    //其中，c是年份的前两位，y是年份的后两位，m是月份，d是日期，这里需要注意的是，如果是1月和2月，c和y需要按照上一年来取值。  
    int w=0;  
      
    int year=today_usenow.year;  
    int month=today_usenow.month;  
    if(today_usenow.month==1 || today_usenow.month==2)  
    {  
        month+=12;  
        year--;  
    }  
    int y=year%100;  
    int c=year/100;  
    int m=month;  
      
    w=y + y/4 +  c/4  - 2*c+ 26* (m+1) / 10 + today_usenow.day -1;  
    while(w<0)  
    {  
        w+=7;  
    }  
    return (w%7);  
  
}  
int is_leap(int year)  
{  
  
    if( (year%4==0 && year%100!=0) || (year%400==0))  
    {  
        return 1;  
    }  
    else  
        return 0;  
}  
int  getmonthdays(int year,int month)  
{  
    return day_cankao[is_leap(year)][month];  
}  
  
  
void print_calendar(today today_usenow)  
{  
    printf("---------------------------\n");  
    printf("Sun Mon Tue Wen Thu Fir Sat\n");  
    int firstday=0;  
    today today_usehere=today_usenow;  
    today_usehere.day=1;  
    int day=getweekday(today_usehere);//日期前  
    //int  daysuseafter  
    int days=getmonthdays(today_usenow.year,today_usenow.month);//月总数  
    // 0 1 2 3 4 5 6  // 6   
    int daysbefore=0;  
    if((today_usenow.month-1)==0)  
    {  
        //现在为1月，去年的十二月份  
        daysbefore=getmonthdays(today_usenow.year-1,12);  
        //  printf("%d is",daysbefore);  
    }  
    else  
    {  
  
  
        daysbefore=getmonthdays(today_usenow.year,today_usenow.month-1);  
    }  
    int daysbefoeit=daysbefore-day+1;  
    printf("");  
    int count=1;  
         if(day==0)  
         {  
             daysbefoeit-=7;  
             for(int i=0;itm_year);   
    printf("Month:  %d\n", 1+p->tm_mon);   
    printf("Day:  %d\n", p->tm_mday);   
    printf("Hour:  %d\n", p->tm_hour);   
    printf("Minute:  %d\n", p->tm_min);   
    printf("Second:  %d\n",  p->tm_sec);   
    printf("Weekday:  %d\n", p->tm_wday);   
    printf("Days:  %d\n", p->tm_yday);   
    printf("Isdst:  %d\n", p->tm_isdst);   
    */  
      
    //printf("%d",day_cankao[0][12]);  
    today_current.year=1900+p->tm_year;  
    today_current.month=1+p->tm_mon;  
    today_current.day= p->tm_mday;  
    today use=today_current;  
    int c1,c2;  
    printf("    %d 年 %d 月 %d 日\n",today_current.year,today_current.month,today_current.day);  
    print_calendar(today_current);  
   while(1)  
   {  
    c1 = getch();  
    if(c1==27)  
    {  
        printf("您已经退出系统");  
        break;  
    }  
    if(c1==110)  
    {  
        printf("    %d 年 %d 月 %d 日\n",today_current.year,today_current.month,today_current.day);  
        //printf("%d \n",getweekday(today_current));  
  
        print_calendar(today_current);  
        use=today_current;  
        continue;  
    }  
    c2 = getch();  
    //printf( "%d %d",c1,c2);  
  
    if(c1==224 && c2==72)  
    {  
        use.month+=1;  
        if(use.month==13)  
        {  
            use.month=1;  
            use.year+=1;  
        }  
        printf("    %d 年 %d 月 %d 日\n",use.year,use.month,use.day);  
        //printf("%d \n",getweekday(today_current));  
  
        print_calendar(use);  
      
    }  
    if(c1==224 && c2==80)  
    {  
        use.month-=1;  
        if(use.month==0)  
        {  
            use.month=12;  
            use.year-=1;  
        }  
        printf("    %d 年 %d 月 %d 日\n",use.year,use.month,use.day);  
        //printf("%d \n",getweekday(today_current));  
  
        print_calendar(use);  
    }  
    if(c1==224 && c2==75)  
    {  
        use.year-=1;  
        printf("    %d 年 %d 月 %d 日\n",use.year,use.month,use.day);  
        //printf("%d \n",getweekday(today_current));  
  
        print_calendar(use);  
    }  
    if(c1==224 && c2==77)  
    {  
        use.year+=1;  
        printf("    %d 年 %d 月 %d 日\n",use.year,use.month,use.day);  
        //printf("%d \n",getweekday(today_current));  
  
        print_calendar(use);  
    }  
    printf("\n");  
    printf("按上下按钮，进行月份变换\n");  
    printf("按左右按钮，进行年份变换\n");  
    printf("按ESC按键，退出系统\n");  
    printf("按N按钮，查看当前日期\n");  
   }  
    //上 224 72  
    //下 224 80  
    //左 224 75  
    //右 224 77  
    //esc 27  
    // n 110  
  
  
      
     return 0;  
}  

c语言实现的万年历显示，按下上下左右按键来更换日期和年份