10070 - Leap Year or Not Leap Year and …

#include<stdio.h>
#define M 2000000

char year[M];
int mod(char[],int);

int main()
{
    int lp,hf,bf,fst=1;
    freopen("in.txt","r",stdin);
    //freopen("out.txt","w",stdout);
    while(gets(year))
    {
        lp=hf=bf=0;
        if(!mod(year,4)&&(mod(year,100)||!mod(year,400)))
        {
            lp=1;
            if(!mod(year,55))
                bf=1;
        }

        if(!mod(year,15))
            hf=1;

        if(fst)
            fst=0;
        else
            printf("\n");

        if(lp&&hf&&bf)
            printf("This is leap year.\nThis is huluculu festival year.\nThis is bulukulu festival year.\n");
        else if(lp&&hf)
            printf("This is leap year.\nThis is huluculu festival year.\n");
        else if(lp&&bf)
            printf("This is leap year.\nThis is bulukulu festival year.\n");
        else if(hf&&bf)
            printf("This is huluculu festival year.\nThis is bulukulu festival year.\n");
        else if(lp)
            printf("This is leap year.\n");
        else if(hf)
            printf("This is huluculu festival year.\n");
        else if(bf)
            printf("This is bulukulu festival year.\n");
        else
            printf("This is an ordinary year.\n");
    }
    return 0;
}

int mod(char year[],int n)
{
    int m,i,y=0;
    for(i=0;year[i];i++)
        y=(y*10+year[i]-48)%n;
    return y;
}