Calender.c

#include<stdio.h>

char *months[]={" ","\n\n\n\n\t\t    January","\n\n\n\n\t\t    February","\n\n\n\t\t    March","\n\n\n\n\t\t    April","\n\n\n\n\t\t    May","\n\n\n\n\t\t    June","\n\n\n\n\t\t    July","\n\n\n\n\t\t    August","\n\n\n\n\t\t    September","\n\n\n\n\t\t    October","\n\n\n\n\t\t    November","\n\n\n\n\t\t    December"};
int dayinmonth[]={0,31,28,31,30,31,30,31,31,30,31,30,31};

int getdaycode(int year)
{
    int daycode,n;
    n=year-1;
    daycode=1 + (2 * 13) + ((3 * (13+1))/5) + n + (n/4) - (n/100) + (n/400) + 2;
    daycode=(daycode%7)-1;
    if(daycode<0)
    {daycode=daycode+7;}
    return daycode;
}

int getleapyear(int year)
{
    if((year%4==0 && year%100!=0)||year%400==0)
    {dayinmonth[2]=29;}
    else{dayinmonth[2]=28; }
    return dayinmonth[2];
}

void calendar(int year,int daycode)
{
    int month,day;
    for(month=1;month<=12;month++)
    {
        printf("\t\t%s\n\n\n",months[month]);
        printf("Sun\tMon\tTue\tWed\tThu\tFri\tSat\n");
        for(day=1;day<=daycode;day++)
        printf("  \t");
        for(day=1;day<=dayinmonth[month];day++)
        {
            printf("%2d",day);
            if((day+daycode)%7>0)
            printf("\t");
            else{printf("\n");}
        }
        daycode=(daycode+dayinmonth[month])%7;
    }
}

int main()
{
    int year,daycode;
    printf("Enter year : ");
    scanf("%d",&year);
    daycode=getdaycode(year);
    dayinmonth[2]=getleapyear(year);
    calendar(year,daycode);
    printf("\n");



    getch();
    return 0;
}