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<stdio.h> #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%-6sn","Sun.", "Mon.", "Tues.", "Wed.", "Thur.", "Fri.", "Sat."); printf("%-3s%-3s%-3s%-3s%-3s%-3s%-3sn","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<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("nn"); } 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：
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