打印日历挂

一、代码

.h

#ifndef __CALEN_H__ #define __CALEN_H__ extern int LeapYear(int year);//判断是否为闰年 extern int Year_1900(int year);//某年距离1990.1.1有多少天 extern int GetDay(int month);//给一个月份输出天数 extern int Month_1(int month);//某月距离1.1有多少天 extern int SumYM(int year,int month);//某年某月距离1990.1.1共多少天 extern int WeekDay(int day);//某月为周几 extern void PrintCal(int year, int day);//打印日历 #endif

.c

#include <stdio.h> #include "main.h" extern int LeapYear(int year)//判断是否为闰年 { if (0 == year % 4 && 0 != year % 100 || 0 == year % 400) { return 366; } else { return 365; } } extern int Year_1900(int year)//某年距离1990.1.1有多少天 { int sum = 0; int i = year - 1; for (i; i >= 1900; --i) { sum += LeapYear(i); } return sum; } extern int GetDay(int year, int month)//判断某月多少天 { switch(month) { case 1:case 3:case 5:case 7:case 8:case 10:case 12:return 31; case 4:case 6:case 9:case 11:return 30; case 2: if (366==LeapYear(year)) { return 29; } else { return 28; } } } extern int Month_1(int year, int month) { int sum = 0; for (month; month > 1; --month) { sum += GetDay(year, month); } return sum; } extern int SumYM(int year, int month)//某年某月距离1990.1.1共多少天 { int sum = 0; sum = Year_1900(year) + Month_1(year, month); return sum; } extern int WeekDay(int year, int month)//某月为周几 { int week = (SumYM(year, month)+1)% 7; return week; } extern void Print7(void) { int i = 0; for (i; i < 7; ++i) { } } extern void PrintCal(int year, int month) { printf("------%d年%d月-------\n", year, month); printf("日 一 二 三 四 五 六\n"); int cal[35] = { 0 }; int i, j=0,k = 1; i = WeekDay(year, month);//4 int t; for (t = 0; t < i; ++t) { printf(" "); } int days = GetDay(year, month); for (j = 1; j <= days; ++j) { printf("%2d ", j); ++t; if (t % 7 == 0) { puts(""); } } }

 main.c

int main(void) { int year = 2025; int month = 1; PrintCal(year,month); }

二、测试用例