*程序说明与注释
#include<stdio.h>
int days(struct date day);
struct date{
int year;
int month;
int day;
};
int 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];
return day.day;
}
int main()
{
P_date term,today;
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");
getch();
}
int days(P_date day)
{
int i,lp;
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,},
};