c++小程序/类Date

声明类Date

要求：

1、使用户可以设置日期，并在输入错误时提示。

a一年12个月，若输入12以外的数，提示“输入月份错误”

b每个月依次有{31,28/29,31,30,31,30,31,31,30,31,30,31}若输入的数值超过该月天数，提示“输入天数错误”。

2、可以查询两个日期之间相差天数

注意：闰年

Code
#include <iostream>
using namespace std;
#include<time.h>
class Date
{   public:
    Date(int,int,int);
    int Leapyear(int);
    double days();
  private:
    int day,month,year;
};

void main()
{   int day,month,year;
  cout<<"请您输入年、月、日 ";
  cin>>year>>month>>day;
  Date date(day,month,year);
  cout<<date.days()<<endl;

}

Date::Date(int day, int month, int year)
{   if (year<0)
  {   cout<<"您所输入的年份不在本程序计算范围之内！"<<endl;
    return ;
  }
  if(month>12||month<1) 
  {   cout<<"您输入的月份有误 "<<endl;   
    return;
  }
  if((month==1||month==3||month==5||month==7||month==8||month==10||month==12))
  {   if(day<1||day>31)
    {   cout<<"您输入的天数有误,"<<endl;
        return;
    }
  }
  if(month==4||month==6||month==9||month==11)
  {   if(day<1||day>30)
    {   cout<<"您输入的天数有误,"<<endl;
        return;
    }
  }
  if(month==2&&(Leapyear(year)))
  {   if(day<1||day>29)
    {   cout<<"您输入的天数有误,"<<endl;
        return;
    }
  }
  if(month==2&&(!Leapyear(year)))
  {   if(day<1||day>28)
    {   cout<<"您输入的天数有误,"<<endl;
        return;
    }
  }
  this->day=day;
  this->month=month;
  this->year=year;
  cout<<"公元"<<year<<"年"<<month<<"月"<<day<<"日"<<endl;
}
inline double Date:: days()
  { struct tm time1,time2; 
    int year;
    int month;
    cout<<"请输入年月日\n";
    cout<<"年:";
    cin>>year;
    time1.tm_year=year-1900;

    cout<<"月:";
    cin>>month;
    time1.tm_mon=month+1;

    cout<<"日:";
    cin>>time1.tm_mday;

    time1.tm_hour=0;
    time1.tm_min=0;
    time1.tm_sec=0;

    cout<<"----------------"<<endl;

    cout<<"年:";
    cin>>year;
    time2.tm_year=year-1900;

    cout<<"月:";
    cin>>month;
    time2.tm_mon=month+1;

    cout<<"日:";
    cin>>time2.tm_mday;
    cout<<"相差天数为:";

    time2.tm_hour=0;
    time2.tm_min=0;
    time2.tm_sec=0;

    return (mktime(&time2)-mktime(&time1))/(24*60*60.0);
}

inline int Date::Leapyear(int year)
{   if(((year%4==0)&&(year%100!=0))||(year%400==0))
    return true;
  else return false;
}