教你如何用C语言实现的一个万年历

该程序简单地输入一个年份(1901年之后的年份)，随后程序输出该年份十二个月的日历。

#include

#define Mon 1

#define Tues 2

#define Wed 3

#define Thur 4

#define Fri 5

#define Sat 6

#define Sun 0

#define January_days 31

#define February_days 28

#define March_days 31

#define April_days 30

#define May_days 31

#define June_days 30

#define July_days 31

#define August_days 31

#define September_days 30

#define October_days 31

#define November_days 30

#define December_days 31

#define first1month January_days

#define first2month January_days+February_days

#define first3month January_days+February_days+March_days

#define first4month January_days+February_days+March_days+April_days

#define first5month January_days+February_days+March_days+April_days+May_days

#define first6month January_days+February_days+March_days+April_days+May_days+June_days

#define first7month January_days+February_days+March_days+April_days+May_days+June_days \

+July_days

#define first8month January_days+February_days+March_days+April_days+May_days+June_days \

+July_days+August_days

#define first9month January_days+February_days+March_days+April_days+May_days+June_days \

+July_days+August_days+September_days

#define first10month January_days+February_days+March_days+April_days+May_days+June_days \

+July_days+August_days+September_days+October_days

#define first11month January_days+February_days+March_days+April_days+May_days+June_days \

+July_days+August_days+September_days+October_days+November_days

int known_weekday = Tues;

int known_year = 1901;

int konwn_month = 1;

int known_day = 1;

int day_count(int month)

{

switch(month)

{

case 1: return 0;break;

case 2: return first1month;break;

case 3: return first2month;break;

case 4: return first3month;break;

case 5: return first4month;break;

case 6: return first5month;break;

case 7: return first6month;break;

case 8: return first7month;break;

case 9: return first8month;break;

case 10: return first9month;break;

case 11: return first10month;break;

case 12: return first11month;break;

}

}

/*char * month_name(int month)

{

switch(month)

{

case 1:

return "January";

break;

case 2:

return "February";

break;

case 3:

return "March";

break;

case 4:

return "April";

break;

case 5:

return "May";

break;

case 6:

return "June";

break;

case 7:

return "July";

break;

case 8:

return "August";

break;

case 9:

return "September";

break;

case 10:

return "October";

break;

case 11:

return "November";

break;

case 12:

return "December";

break;

default:

break;

}

}*/

char * month_name(int month)

{

switch(month)

{

case 1:

return "一月";

break;

case 2:

return "二月";

break;

case 3:

return "三月";

break;

case 4:

return "四月";

break;

case 5:

return "五月";

break;

case 6:

return "六月";

break;

case 7:

return "七月";

break;

case 8:

return "八月";

break;

case 9:

return "九月";

break;

case 10:

return "十月";

break;

case 11:

return "十一月";

break;

case 12:

return "十二月";

break;

default:

break;

}

}

/*按格式打印某年某月名称*/

void first_line_print(int month, int year)

{

//printf("%20s %d \n",month_name(month),year);

printf("%8d年 %s \n",year, month_name(month));

}

/*按格式打印星期名称*/

void week_print()

{

//printf("%-6s%-6s%-6s%-6s%-6s%-6s%-6s\n","Sun.", "Mon.", "Tues.", "Wed.", "Thur.", "Fri.", "Sat.");

printf("%-3s%-3s%-3s%-3s%-3s%-3s%-3s\n","日", "一", "二", "三", "四", "五", "六");

}

/*计算该年该月份与已知日子之间的距离天数*/

int date_distance_count(int month, int year)

{

int leap_year_count = 0;

int i;

int distance;

if (year > known_year)

{

for (i=known_year; i

{

if(((i%4 == 0) && (i%100 != 0) ) || (i%400 == 0))

{

leap_year_count++;

}

}

if (month > 2)

{

if(((year%4 == 0) && (year%100 != 0) ) || (year%400 == 0))

{

leap_year_count++;

}

}

}

else

if (year == known_year)

{

if (month > 2)

{

leap_year_count = 1;

}

}

distance = (year - known_year)*365 + leap_year_count + day_count(month);

return distance;

}

/*确定该月份第一天是星期几*/

int makesure_firstday_weekday(int month, int year)

{

int date_distance = 0;

int weekday;

date_distance = date_distance_count(month, year);

weekday = (known_weekday + date_distance)%7;

return weekday;

}

/*依次打印出该月份的日子*/

void print_in_turn(int month, int firstday, int year)

{

int i = 1;

int weekday;

switch(firstday)

{

case Sun:

break;

case Mon:

printf("%-3s","");

break;

case Tues:

printf("%-6s","");

break;

case Wed:

printf("%-9s","");

break;

case Thur:

printf("%-12s","");

break;

case Fri:

printf("%-15s","");

break;

case Sat:

printf("%-18s","");

break;

}

switch(month)

{

case 1:

case 3:

case 5:

case 7:

case 8:

case 10:

case 12:

{

for(i=0; i<31; i++)

{

weekday = (firstday + i)%7;

printf("%-3d",i+1);

if(weekday == Sat)

{

printf("\n");

}

}

break;

}

case 2:

{

if(((year%4 == 0) && (year%100 != 0) ) || (year%400 == 0)) /*闰年*/

{

for(i=0; i<29; i++)

{

weekday = (firstday + i)%7;

printf("%-3d",i+1);

if(weekday == Sat)

{

printf("\n");

}

}

break;

}

else /*平年*/

{

for(i=0; i<28; i++)

{

weekday = (firstday + i)%7;

printf("%-3d",i+1);

if(weekday == Sat)

{

printf("\n");

}

}

break;

}

}

case 4:

case 6:

case 9:

case 11:

{

for(i=0; i<30; i++)

{

weekday = (firstday + i)%7;/*计算该天是星期几*/

printf("%-3d",i+1);

if(weekday == Sat)

{

printf("\n");/*如果是星期六，则换行*/

}

}

break;

}

}

}

void date_print(int month, int year)

{

int firstday;

firstday = makesure_firstday_weekday(month, year);

print_in_turn(month, firstday, year);

printf("\n");

}

void main_month(int month, int year)

{

first_line_print(month, year);

week_print();

date_print(month, year);

printf("\n\n");

}

void main_calendar(int year)

{

int i;

for(i=1; i<=12; i++)

{

main_month(i, year);

}

}

int main()

{

int year;

printf("请输入年份：year = ");

scanf("%d",&year);

printf("\n");

while(year < 1902)

{

printf("请输入大于1901的年份\n");

printf("请输入年份：year = ");

scanf("%d",&year);

printf("\n");

}

main_calendar(year);

scanf(" ");

return 0;

}

运行效果图：