原题链接：[编程入门]结构体之时间设计
解题思路:
用一个长度为12的数组，记录每个月的天数，除了2月先不记录；
输入日期，判断闰年2月赋值29，平年28；
计算是第几天，输出；
参考代码:
#include <stdio.h>
#include <iostream>
using namespace std;
class riqi {
private:
int year;
int month;
int day;
public:
riqi( int y, int m, int d )
{
year = y;
month = m;
day = d;
}
void count();
};
void riqi::count()
{
int n = 0;
int a[12];
a[0] = 31;
a[1] = 0;
a[2] = 31;
a[3] = 30;
a[4] = 31;
a[5] = 30;
a[6] = 31;
a[7] = 31;
a[8] = 30;
a[9] = 31;
a[10] = 30;
a[11] = 31;
if ( year % 100 == 0 ) //判断年数为2000这样的年份
{
if ( year % 400 == 0 )
a[1] = 29;
else
a[1] = 28;
}
if ( year % 4 == 0 && year % 100 != 0 ) //能被4整除但不能被100整除
a[1] = 29;
if ( year % 4 != 0 )
a[1] = 28;
for ( int i = 0; i < month - 1; i++ ) //数组下标从0开始，所以month-1
n = n + a[i];
n += day;
cout << n;
}
int main()
{
int Y, M, D;
cin >> Y;
cin >> M;
cin >> D;
riqi A( Y, M, D );
A.count();
return(0);
}几个月前写的，翻出来弄题解，讲的思路没有写的时候清晰～
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