打鱼还是晒网

 #include<stdio.h>

typedef struct
{
    int year;
    int month;
    int day;
}DATE;

int countday(DATE today);
int runyear(int year);

int main()
{
    DATE today;
    int totalday;
    int result;
    printf("please input 指定日期 包括年，月，日，如：1999 1 31\n");
    scanf("%d%d%d",&today.year,&today.month,&today.day);

    totalday=countday(today);

    result=totalday%5;
    if(result>0&&result<4)
    printf("今天打鱼\n");
    else
    printf("今天晒网\n");

    return 0;
} 

int runyear(int year)
{
    if((year%4==0&&year%100!=0)||(year%400==0))
    return 1;
    else
    return 0;
}

int countday(DATE today)
{
    int permonth[13]={0,31,28,31,30,31,30,31,31,30,31,30};
    int totalday=0,year,i;
    for(year=1990;year<today.year;year++)
    {
        if(runyear(year))
         totalday+=366;
         else
         totalday+=365;
    }

    if(runyear(today.year))
    permonth[2]+=1;

    for(i=0;i<today.month;i++)
    totalday+=permonth[i];

    totalday+=today.day;

    return totalday;

}