date.cpp

为SSD5课程《数据结构与算法》中的练习

#include "Date.h"
#include <string>

//Default constructor.Initializes the private data members to default values  
Date::Date(void):month(0), day(0), year(0), hour(0), minute(0), second (0){}

//Six parameter constructor.Accepts integers for the day, month, year, hour, minute, and second  
Date::Date (int imonth, int iday, int iyear, int ihour, int iminute, int isecond):
month(imonth), day(iday), year(iyear), hour(ihour), minute(iminute), second(isecond){} 

//Accessors and Mutators 
//Set the value of the day, month, year, hour, minute, and second
void Date::setMonth(int&m){month =m;}	    
void Date::setDay(int&d){day=d;}
void Date::setYear(int&y){year=y;}
void Date::setHour(int&h){hour=h;}
void Date::setMinute(int&m){minute=m;}
void Date::setSecond(int&s){second=s;}

//Return the value of the day, month, year, hour, minute, and second
int Date::getMonth() const{return month;}	    
int Date::getDay() const{return day;}	    
int Date::getYear() const{return year;}    
int Date::getHour() const{return hour;}	    
int Date::getMinute() const{return minute;}	    
int Date::getSecond() const{return second;}

//Compares Date objects for equality
bool Date::operator== (const Date &rhs){
	if(month==rhs.month && day==rhs.day && year==rhs.year &&
		hour==rhs.hour && minute==rhs.minute && second==rhs.second){
		return true;
	}
	return false;
}

//Compares Date objects, returns true if the invoking Date object is less than the other Date object 
bool Date::operator< (const Date &rhs){
	int cyear,cmonth,cday,chour,cminute,csecond;
	
	cyear = year - rhs.getYear();
	cmonth = month - rhs.getMonth();
	cday = day - rhs.getDay();
	chour = hour - rhs.getHour();
	cminute = minute - rhs.getMinute();
	csecond = second - rhs.getSecond();

    if(cyear==0 && cmonth==0 && cday==0 && chour==0 && cminute==0 && csecond<0)
	    return true;
	else if(cyear==0 && cmonth==0 && cday==0 && chour==0 && cminute<0)
		return true;
	else if(cyear==0 && cmonth==0 && cday==0 && chour<0)
		return true;
	else if(cyear==0 && cmonth==0 && cday<0)
		return true;
	else if(cyear==0 && cmonth<0)
		return true;
	else if(cyear<0)
		return true;
	else
		return false;
}

//Outputs a Date object to an output stream in the form "mm/dd/yyyy hh:nn:ss"
ostream &operator<<(ostream& out, const Date& mdy){
	out<<mdy.getMonth()<<"/"<<mdy.getDay()<<"/"<<mdy.getYear()<<""
	   <<mdy.getHour()<<":"<<mdy.getMinute()<<":"<<mdy.getSecond();
	return out;
}

//This operator reads a Date object from an input stream
istream &operator>>(istream& in, Date& mdy){
    
	string date_string,time_string;
	int month,day,year,hour,minute,second;
	int posn;

	if(in == cin) {
		cout << "Form : mm/dd/yyyy hh:nn:ss\n";
	}
	
	in >> date_string;
	in >> time_string;

	posn = date_string.find_first_of ("/", 0);
	month = atoi(date_string.substr(0, posn).c_str());
	mdy.setMonth(month);
	day = atoi(date_string.substr(posn + 1, date_string.length()).c_str()); 
	mdy.setDay(day);
	posn = date_string.find_first_of("/", posn + 1) ;
	year = atoi(date_string.substr(posn + 1,date_string.length()).c_str());
	mdy.setYear(year);
	
	posn = time_string.find_first_of (":", 0);
	hour = atoi(time_string.substr(0, posn).c_str());
	mdy.setHour( hour);
	minute = atoi(time_string.substr(posn + 1,time_string.length()).c_str());
	mdy.setMinute(minute);
	posn = time_string.find_first_of(":",posn +1);
	second = atoi(time_string.substr(posn + 1,time_string.length()).c_str());
	mdy.setSecond(second);
	
    return in;

}