C语言实现万年历

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，供大家参考，具体内容如下

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include<conio.h>
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;i<day+7;i++)
 { 

  printf("%d ", daysbefoeit);
  daysbefoeit++; 

 }
 printf("\n");
 count=7;
 }
 else
 {
 for(int i=0;i<day;i++)
 {
  printf("%d ", daysbefoeit);
  daysbefoeit++;
 }
 count=day;
 }
 int m=1;
 for(int i=0;i<=6-day;i++)
 {
 if(m<10)
 {
  printf(" %d ",m);
 }
 else
 { 

  printf("%d ",m);
 } 

 m++;
 }
 printf("\n");
 if(day==0)
 {
 count=14;
 }
 else
 {
 count=7;
 }
 int hang=0;
 while(m<=days)
 {
 if(m<10)
 {
  printf(" %d ",m);
 }
 else
 { 

  printf("%d ",m);
 }
 hang++;
 if(hang==7)
 {
  printf("\n");
  hang=0;
 } 

 m++;
 }
 if(day==0)
 {
 count=days+7;
 }
 else
 {
 count=day+days;
 }
 int newmonth=1;
 for(int j=hang;j<7;j++)
 { 

 if(newmonth<10)
 {
 printf(" %d ",newmonth);
 }
 else
 { 

 printf("%d ",newmonth);
 } 

 newmonth++;
 }
 printf("\n");
 count=count+7-hang;
 for(int j=0;j< 42-count;j++)
 {
 if(newmonth<10)
 {
 printf(" %d ",newmonth);
 }
 else
 { 

 printf("%d ",newmonth);
 }
 newmonth++;
 } 

}
//int getmonth 

int main()
{
 time_t timep;
 struct tm *p;
 time(&timep);
 p =localtime(&timep); //此函数获得的tm结构体的时间，是已经进行过时区转化为本地时间
 //p = gmtime(&timep); //把日期和时间转换为格林威治(GMT)时间的函数 

 /*printf("Year: %d\n", 1900+p->tm_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;
} 

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