提高篇第16-19課第三題

#include <stdio.h>
#include <stdlib.h>
//第三題
#include<stdio.h>
int days(int y, int m, int d);
int main()
{
	int year, month, day;
	printf("輸入年 月 日: ");
	scanf("%d %d %d", &year, &month, &day);
	printf("這是該年的第 %d 天\n", days(year, month, day));
	return 0;
}


int days(int y, int m, int d)
{
	int day=0,i;
	int month[13] = { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
	for (i = 0; i <m; i++)
		day += month[i];
	day += d;
	if ((y % 400 == 0) || (y % 4 == 0 && y % 100 != 0))
		if (m>2)
			day += 1;
	return day;
}