45_结构体变量

//_45_结构体变量
//_45_main.cpp

//实例：定义一个结构体变量，（年月日），计算该日是本年中的第几天

#include <stdio.h>
#include <stdlib.h>

struct
{
	int year;
	int month;
	int day;
}data;//定义一个结构并声明对象为data

int main()
{
	int days;
	printf("请输入日期（年、月、日）：");
	scanf("%d %d %d",&data.year,&data.month,&data.day);
	switch(data.month)
	{
	case 1:
		days = data.day;
		break;
	case 2:
		days = data.day+31;
		break;
	case 3:
		days = data.day+59;
		break;
	case 4:
		days = data.day+90;
		break;
	case 5:
		days = data.day+120;
		break;
	case 6:
		days = data.day+151;
		break;
	case 7:
		days = data.day+181;
		break;
	case 8:
		days = data.day+212;
		break;
	case 9:
		days = data.day+243;
		break;
	case 10:
		days = data.day+273;
		break;
	case 11:
		days = data.day+304;
		break;
	case 12:
		days = data.day+334;
		break;
	default:
		exit(1);//非正常退出
	}
	if(data.year%4==0&&data.year%100!=0 || data.year%400==0)
		if(data.month>=3)
			days = days + 1;
	printf("%d月%d日是%d年的第%d天.\n",data.month,data.day,data.year,days);

	system("pause");
	return 0;
}