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写一个函数days,

【定义一个结构体变量(包括年、月、日)。计算该日在本年中是第几天,注意闰年问题（即将闰年情况包含在内）】

由主函数将年、月、日传递给days函数,计算后将日子数传回主函数输出。

​#include <stdio.h>typedef struct {int year;int month;int day;
} Date;int isLeapYear(int year) {if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0)return 1;return 0;
}int daysOfMonth(int month, int year) {int days[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};if (month == 2 && isLeapYear(year))return 29;return days[month - 1];
}int dayOfYear(Date date) {int days = 0;for (int i = 1; i < date.month; i++) {days += daysOfMonth(i, date.year);}days += date.day;return days;
}int main() {Date date;printf("Enter year, month, day: ");scanf("%d %d %d", &date.year, &date.month, &date.day);int day = dayOfYear(date);printf("The day is the %dth day of the year.\n", day);return 0;
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程序实现

#include <stdio.h>typedef struct {int year;int month;int day;
} Date;int isLeapYear(int year) {if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0)return 1;return 0;
}int daysOfMonth(int month, int year) {int days[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};if (month == 2 && isLeapYear(year))return 29;return days[month - 1];
}int days(Date date) {int days = 0;for (int i = 1; i < date.month; i++) {days += daysOfMonth(i, date.year);}days += date.day;return days;
}int main() {Date date;printf("Enter year, month, day: ");scanf("%d %d %d", &date.year, &date.month, &date.day);int day = days(date);printf("The day is the %dth day of the year.\n", day);return 0;
}

代码解释：

1. 定义 `days` 函数：编写 `days` 函数，实现第1题的计算逻辑。该函数接受年、月、日作为参数，并返回该日期在一年中的第几天。

2. 主函数调用：在主函数中，读取用户输入的年、月、日，并调用 `days` 函数计算天数，最后将结果输出。