日历程序

来源：互联网发布：unsw moodle 网络编辑：程序博客网时间：2024/06/05 15:14

需求描述：任意输入一个年份，如2011，格式化打印出此年份十二个月份的日历。

程序比较简单，不多说了，直接上C源码，代码已在VC6.0上验证通过。

///////////////////////////////////////////////////////////////////////////////////////////////////////////

/*****************************************************************
* 文件名：日历
* 实现功能：实现年历的打印
* 作者：韩立忠 2011.08.15
****************************************************************/

/************************* 引入的头文件 *************************/

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

/************************* 全局函数声明 *************************/

unsigned is_leap(unsigned);                   // 判断某年是否闰年
unsigned number_of_leap(unsigned);            // 判断从基准年1900年起的闰年数
unsigned weekday_of_newyears_day(unsigned);   // 判断某年元旦星期几
unsigned days_of_month(unsigned, unsigned);   // 判断某确定年月的天数

/**************************** 主函数 ****************************/

void main(void)
{
unsigned year         = 0;
unsigned month        = 0;
unsigned day          = 0;
unsigned weekday      = 0;
unsigned i_week       = 0;
unsigned day_of_month = 0;

printf("Input Year: ");
scanf("%d", &year);

weekday = weekday_of_newyears_day(year);
for (month = 1; month <= 12; month++)
{
  printf("\nMONTH:%2d\n", month);
  printf("---------------------------------------------------\n");
  printf("SUN\tMON\tTWE\tWEN\tTHU\tFRI\tSAT\n");
  printf("---------------------------------------------------\n");

  for (i_week = 0; i_week < weekday; i_week++)
  {
   printf("   \t");
  }

  day_of_month = days_of_month(year, month);
  for (day = 1; day <= day_of_month; day++)
  {
   printf("%2d\t", day);
   weekday = (weekday + 1) % 7;
   if ((0 == weekday) && (day != day_of_month))
   {
    printf("\n");
   }
  }

printf("\n---------------------------------------------------\n");
}
}

/****************************************************************/

/* 判断某年是否闰年 */
unsigned is_leap(unsigned year)
{
if (((0 == year % 4) && ( year % 100 != 0)) || (0 == year % 400))
{
return 1;
}
return 0;
}

/* 判断从基准年1900年起到指定年的闰年数 */
unsigned number_of_leap(unsigned year)
{
unsigned count = 0;
unsigned i_year = 0;

if (year < 1900)
{
printf("Input error! Year must larger than 1900!\n");
exit(0);
}

for (i_year = 1900; i_year <= year; i_year += 4)
{
  if (is_leap(i_year))
  {
   count++;
  }
}
return count;
}

/* 判断某年元旦星期几，已知基准年1900年元旦星期一 */
unsigned weekday_of_newyears_day(unsigned year)
{
unsigned weekday = 0;
weekday = year - 1900 + number_of_leap(year) + 1;
if (is_leap(year))
{
weekday--;
}
weekday %= 7;
return weekday;
}

/* 判断某确定年月的天数 */
unsigned days_of_month(unsigned year, unsigned month)
{
unsigned day = 0;
if ((4 == month) || (6 == month) || (9 == month) || (11 == month))
{
  day = 30;
}
else if (2 == month)
{
  day = 28 + is_leap(year);
}
else
{
  day = 31;
}
return day;
}

/* ************************* The End ************************** */

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