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【C】在控制台打印日历

作者:卫强 / 发布于2014/10/10/ 514


	/***************************************
	Student:赵忠印 032-25
	Date: 2006.9.23
	Purpose: Coursework 1
	这个程序能打印一年的日历
	***************************************/
	#include<stdio.h>

	int isLeapyear(int year)/*this function is used to calculate that if a year is a leap year*/
	{
	 if(year%4==0)
	 {
	 if(year%100!=0)
	 return 1;
	 else if(year%100==0&&year%400==0)
	 return 1;
	 else
	 return 0;
	 }
	 else
	 return 0;

	}

	void printCalendar(int year,int day)/*this function is used to print the calendar of a year*/
	{
	 int month;
	 int days;
	 int FristDayOfMonth;
	 int LastDayOfMonth;
	 int i;
	 for(month=1;month<=12;month++)
	 {
	 printf("\n\n");
	 switch(month)
	 {
	 case 1:printf("\tJanuary %d\n",year);
	 days=31;/*how many days in this month*/
	 break;
	 case 2:printf("\tFebruary %d\n",year);
	 days=(isLeapyear(year))? 29:28;/*this is used to calculate if there are 29 or 28 days in february*/
	 break;
	 case 3:printf("\tMarch %d\n",year);
	 days=31;
	 break;
	 case 4:printf("\tApril %d\n",year);
	 days=30;
	 break;
	 case 5:printf("\tMay %d\n",year);
	 days=31;
	 break;
	 case 6:printf("\tJune %d\n",year);
	 days=30;
	 break;
	 case 7:printf("\tJuly %d\n",year);
	 days=31;
	 break;
	 case 8:printf("\tAugust %d\n",year);
	 days=31;
	 break;
	 case 9:printf("\tSeptember %d\n",year);
	 days=30;
	 break;
	 case 10:printf("\tOctober %d\n",year);
	 days=31;
	 break;
	 case 11:printf("\tNovember %d\n",year);
	 days=30;
	 break;
	 case 12:printf("\tDecember %d\n",year);
	 days=31;
	 break;
	 default:printf("error");
	 }
	 printf(" S M T W T F S\n");/*print the days of a week*/
	 if(month==1)/*January*/
	 {
	 FristDayOfMonth=day;/*this is used to calculate the day of week that it is the frist day of the month*/
	 LastDayOfMonth=(days-8+day)%7;/*this is used to calculate the day of week that it is the last day of the month*/

	 }
	 else/*other months*/
	 {
	 FristDayOfMonth=(LastDayOfMonth==7)?1:LastDayOfMonth+1;/*this is used to calculate the day of week that it is the frist day of the month*/
	 LastDayOfMonth=(days-8+FristDayOfMonth)%7;/*this is used to calculate the day of week that it is the last day of the month*/

	 }
	 for(i=1;i<FristDayOfMonth*3-2;i++)/*calculate the location of the frist day of a month*/
	 printf(" ");
	 for(i=1;i<=days;i++)/*print the calendar of a month*/
	 {
	 printf("%3d",i);
	 if((i-(7-FristDayOfMonth+1))%7==0)
	 printf("\n");/* because it is Saturday*/
	 }

	 }
	}

	int main()
	{
	 int choose;/*what is day today*/
	 int year;/*which year,you'd better input a interger*/
	 printf("\n\n\t\tWelcome You!\n\n");
	 printf("please input a year\n");
	 scanf("%d",&year);
	 printf("\nplease choose the day of the week that is January 1st\n");
	 printf("\n1:Sunday 2:Monday 3:Tuseday 4:Wednesday 5:Thrusday 6;Friday 7:Saturday\n");
	 printf("\nyour choose:[ ]\b\b");
	 scanf("%d",&choose);
	 if(choose<1||choose>7)
	 {
	 printf("choose error");
	 return 1;
	 }
	 printCalendar(year,choose);/*this function will print the whole calendar of this year that it input by you*/
	 getchar();
	 getchar();
	 return 1;/*because my English is poor,it is difficulty to read,please excuse you,I swear I will study it well*/
	}

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