第十七周上机项目四

/*
 *Copyright (c) 2014, 烟台大学计算机学院
 *All rights reserved.
 *文件名称：text.cpp
 *作者：陈栋梁
 *完成日期：2014年 12 月 27 日
 *版本号：v1.0
 *
 */
#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);
}

运行结果：