C语言小程序实现万年历

分享一个简单的小程序，看看如何打印万年历吧~

程序打开时时这样的，输入一个年份：

比如输入2016再回车，效果如下：

下面我们来看看实现这个程序的代码吧：

#include<stdio.h>
#include<windows.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%-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<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;
	
	system("title c语言研究中心 www.dotcpp.com");
	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;
}

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