是得要告诉第一天是做什么的,是打鱼还是晒网.并且要给出具体的哪天(打鱼的第几天或是晒网的第几天).
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//参考
程序代码：
#include<stdio.h>
int days(struct date day);
struct date{
int year;
int month;
int day;
};
void main()
{
struct date today,term;
int yearday,year,day;
printf(\"Enter year/month/day:\");
scanf(\"%d%d%d\",&today.year,&today.month,&today.day); /*输入日期*/
term.month=12; /*设置变量的初始值：月*/
term.day=31; /*设置变量的初始值：日*/
for(yearday=0,year=1990;year<today.year;year++)
{
term.year=year;
yearday+=days(term); /*计算从1990年至指定年的前一年共有多少天*/
}
yearday+=days(today); /*加上指定年中到指定日期的天数*/
day=yearday%5; /*求余数*/
if(day>0&&day<4) printf(\"he was fishing at that day.\n\"); /*打印结果*/
else printf(\"He was sleeping at that day.\n\");
}
int days(struct date day)
{
static int day_tab[2][13]=
{{0,31,28,31,30,31,30,31,31,30,31,30,31,}, /*平均每月的天数*/
{0,31,29,31,30,31,30,31,31,30,31,30,31,},
};
int i,lp;
lp=day.year%4==0&&day.year%100!=0||day.year%400==0;
/*判定year为闰年还是平年，lp=0为平年，非0为闰年*/
for(i=1;i<day.month;i++) /*计算本年中自1月1日起的天数*/
day.day+=day_tab[lp][i];
return day.day;
}
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