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