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# 用C语言在控制台打印日历

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```/***************************************
Student:赵忠印 032-25
Date:  2006.9.23
Purpose: Coursework 1

***************************************/
#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");
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*/
}
```