第17周项目4(1)-日期结构体

/*
*Copyright (c) 2014, 烟台大学计算机学院
*All rights reserved.
*文件名称：week17-project4-1.cpp
*作者：高赞
*完成日期：2014年 12 月 19 日
*版本号：v1.0
*
*问题描述：定义一个结构体变量，输入年月日，计算该日是这一年的第几天
*/
#include <iostream>
using namespace std;
int day(int y, int m, int d);
struct Date
{
int year;
int month;
int day;
};
int main()
{
Date date;
cout<<"input year,month,day:";
cin>>date.year>>date.month>>date.day;
int days;
days=day(date.year,date.month,date.day);
cout<<date.month<<"月"<<date.day<<"日是"<<date.year<<"年的第"<<days<<"天."<<endl;
return 0;
}
int day(int y, int m, int d)
{
int i,sumdays;
for (i=1; i<=m; ++i)
{
switch (i)
{
case 1:
sumdays=0;
break;
case 3:
{
if (((y%4 == 0 && y%100 != 0) || y%400 == 0))
sumdays+=29;
else sumdays+=28;
}
break;
case 2:
case 4:
case 6:
case 8:
case 9:
case 11:
sumdays+=31;
break;
case 5:
case 7:
case 10:
case 12:
sumdays+=30;
break;
}
}
sumdays+=d;
return(sumdays);
}