输入年份得出日历

#include <stdio.h>
#include <stdlib.h>

/* run this program using the console pauser or add your own getch, system("pause") or input loop */
int check_years(int year)
{
	if((year%400==0)||(year%4==0&&year%100!=0))
	{
		return 1;			//如年返回1 
	}	
	else
	{
		return 0;			//平年返回0 
	}
}
//判断输入这一年的1月1日是星期几
//这一年以前所有天数之和%7 
int week_f(int year)
{
	if(year==1)
	{
		return 1;			//公元1年1月1日 
	}
	int sum=0;
	for(int i=1;i<year;i++)
	{
		if(check_years(i)==1)
		{
			sum=sum+366;
		}
		else
		{
			sum=sum+365;
		}
	}
	return (sum+1)%7;			//加1是因为是1号 
} 
//返回每个月的天数，需要两个：闰年，平年 
int month_run(int n)
{
	switch(n)
	{
		case 1:
			return 31;
		case 2:
			return 29;
		case 3:
			return 31;
		case 4:
			return 30;
		case 5:
			return 31;
		case 6:
			return 30;
		case 7:
			return 31;
		case 8:
			return 31;
		case 9:
			return 30;
		case 10:
			return 31;
		case 11:
			return 30;
		case 12:
			return 31;
	}
}
int month_ping(int n)
{
	switch(n)
	{
		case 1:
			return 31;
		case 2:
			return 28;
		case 3:
			return 31;
		case 4:
			return 30;
		case 5:
			return 31;
		case 6:
			return 30;
		case 7:
			return 31;
		case 8:
			return 31;
		case 9:
			return 30;
		case 10:
			return 31;
		case 11:
			return 30;
		case 12:
			return 31;
	}
}
void run(int week)
{
	int enter=0;			//
	int wee=week;
	for(int i=1;i<=12;i++)
	{
		printf("--------->%d month<--------\n",i);
		printf("0	1	2	3	4	5	6\n");
		for(int k=0;k<wee;k++)
				{//输出空格 
					printf("	");
					enter++;
				} 
		for(int j=1;j<=month_run(i);j++)
		{
			if(enter%7==0)
			{
				printf("\n");
			}
			printf("%d	",j);
			enter++;
		}
		wee=(wee+month_run(i))%7;
		enter=enter-wee;
		printf(("\n\n\n"));
	}
}
void ping(int week)
{
	int enter=0;			//记录换行 
	int wee=week;
	for(int i=1;i<=12;i++)	//12月 
	{
		printf("--------->%d month<--------\n",i);
		printf("0	1	2	3	4	5	6\n");
		for(int k=0;k<wee;k++)
				{//输出空格 
					printf("	");
					enter++;
				} 
		for(int j=1;j<=month_ping(i);j++)
		{
			if(enter%7==0)
			{
				printf("\n");
			}
			printf("%d	",j);
			enter++;
		}
		wee=(wee+month_ping(i))%7;				//第i月最后一天是星期几 
		enter=enter-wee;						//减去wee，则这一行为“空”，不会影响enter下次判断 
		printf(("\n\n\n"));
	}
}
int main(int argc, char *argv[]) {
	int year=0;
	int week=0;
	int sum=0;
	printf("input the year:");
	scanf("%d,",&year);
	week=week_f(year);
	if(check_years(year)==1)
	{
		run(week);
	}
	else
	{
		ping(week);
	}
	return 0;
}

month.run和month.ping可以用if判断是平年还是闰年，返回二月的天数，之后void run 和void ping 也可以改成一个。

#include <stdio.h>
#include <stdlib.h>

/* run this program using the console pauser or add your own getch, system("pause") or input loop */
int check_years(int year)
{
	if((year%400==0)||(year%4==0&&year%100!=0))
	{
		return 1;			//如年返回1 
	}	
	else
	{
		return 0;			//平年返回0 
	}
}
//判断输入这一年的1月1日是星期几
//这一年以前所有天数之和%7 
int week_f(int year)
{
	if(year==1)
	{
		return 1;			//公元1年1月1日 
	}
	int sum=0;
	for(int i=1;i<year;i++)
	{
		if(check_years(i)==1)
		{
			sum=sum+366;
		}
		else
		{
			sum=sum+365;
		}
	}
	return (sum+1)%7;			//加1是因为是1号 
} 
//返回每个月的天数，需要两个：闰年，平年 
int month(int n,int year)
{
	switch(n)
	{
		case 1:
			return 31;
		case 2:
			if(year==1)
			{
				return 29;
			}
			else
			{
				return 28;
			}
		case 3:
			return 31;
		case 4:
			return 30;
		case 5:
			return 31;
		case 6:
			return 30;
		case 7:
			return 31;
		case 8:
			return 31;
		case 9:
			return 30;
		case 10:
			return 31;
		case 11:
			return 30;
		case 12:
			return 31;
	}
}
void run(int week,int year)
{
	int enter=0;			//
	int wee=week;
	for(int i=1;i<=12;i++)
	{
		printf("--------->%d month<--------\n",i);
		printf("0	1	2	3	4	5	6\n");
		for(int k=0;k<wee;k++)
		{//输出空格 
			printf("	");
			enter++;
		} 
		for(int j=1;j<=month(i,year);j++)
		{
			if(enter%7==0)
			{
				printf("\n");
			}
			printf("%d	",j);
			enter++;
		}
		wee=(wee+month(i,year))%7;
		enter=enter-wee;
		printf(("\n\n\n"));
	}
}
int main(int argc, char *argv[]) {
	int year=0;
	int week=0;
	int sum=0;
	int y;
	printf("input the year:");
	scanf("%d,",&year);
	y=check_years(year);
	week=week_f(year);
	run(week,y);
	return 0;
}