小弟刚接触C语言不久，这是“三天打鱼，两天嗮网”的程序，但是不知道为什么运行不出来？还请大侠指点如何修改？谢谢。。。
#include"stdio.h"
struct date{
    int year ;
    int month;
    int day;
};
days(day)
struct date day;
{
static int day_tab[2][13]=
    {{0,31,28,31,30,31,30,31,30,31,30,31,30,31,},
     {0,31,29,31,30,31,30,31,30,31,30,31,30,31,},
    };
    int lp,i;
    lp=day.year%4==0 && day.year%100!=0 || day.year%400==0;
    for(i=1;i<=day.month;i++)
        day.day+=day_tab[lp][i];
    return(day.day);
   
}
main()
{
    struct date today,term;
    int yearday,year,day;
    printf("input year/month/day\n");
    scanf("%d%d%d\n",&today.year,&today.month,&today.day);
    term.month=12;
    term.day=31;
    for(yearday=0,year=1990;year<today.year;year++)
    {
        term.year=year;
        yearday+=days(term);
    }
    yearday+=days(today);
    day=yearday%5;
    if (day>0 && day<4)
        printf("fishing day\n");
    else
        printf("sleeping day\n");
}

这程序有啥用？

计算哪天打鱼，哪天嗮网的程序，但是运行有bug。。。。

#include"stdio.h"
struct date{
    int year ;
    int month;
    int day;
};
days(date day)       //形参同时声明类型
//date day;
{
static int day_tab[2][13]=
    {{0,31,28,31,30,31,30,31,31,30,31,30,31},    //你的月数不对，而且每月的天数不对，要细心！
     {0,31,29,31,30,31,30,31,31,30,31,30,31},
    };
    int lp,i;
    lp=day.year%4==0 && day.year%100!=0 || day.year%400==0;
    for(i=1;i<=day.month;i++)
        day.day+=day_tab[lp][i];
    return(day.day);
   
}
void main()    //无返回值时函数要声明为void
{
    struct date today,term;
    int yearday,year,day;
    printf("input year/month/day\n");
    scanf("%d%d%d\n",&today.year,&today.month,&today.day);
    term.month=12;
    term.day=31;
    for(yearday=0,year=1990;year<today.year;year++)
    {
        term.year=year;
        yearday+=days(term);
    }
    yearday+=days(today);
    day=yearday%5;
    if (day>0 && day<4)
        printf("fishing day\n");
    else
        printf("sleeping day\n");
}

谢谢~~