Difficulty with assignment
My prof wrote this .h file of class Data that I have to implement.
class Date {
public :
// Dafault Constructor , set the date to the actual date
Date ();
// Constructor , pass the date in the form of dd ,mm , yyyy
// Note that the program crashes if the date is not valid ...
Date ( int d, int m, int y);
// Copy Constructor
Date ( const Date & to_copy );
// Getters
int year () const ;
int month () const ;
int day () const ;
// return the year from the date d, if d it not passed , it returns the year from now .
// Usefull to compute the age of a persone , where this is the person 's birth date
int yearsFrom ( Date d = Date ()) const ;
// return the date as a string in the form dd/mm/ yyyy
// Useful to print on the screen
std :: string str () const ;
private :
bool _isValid () const ;
int _year ;
int _month ;
int _day ;
};
I don't understand the parameter of int yearsFrom function. What does it means?
Is it possible to put an object equalto a constructor?
class Date {
public :
// Dafault Constructor , set the date to the actual date
Date ();
// Constructor , pass the date in the form of dd ,mm , yyyy
// Note that the program crashes if the date is not valid ...
Date ( int d, int m, int y);
// Copy Constructor
Date ( const Date & to_copy );
// Getters
int year () const ;
int month () const ;
int day () const ;
// return the year from the date d, if d it not passed , it returns the year from now .
// Usefull to compute the age of a persone , where this is the person 's birth date
int yearsFrom ( Date d = Date ()) const ;
// return the date as a string in the form dd/mm/ yyyy
// Useful to print on the screen
std :: string str () const ;
private :
bool _isValid () const ;
int _year ;
int _month ;
int _day ;
};
I don't understand the parameter of int yearsFrom function. What does it means?
Is it possible to put an object equalto a constructor?
| Is it possible to put an object equalto a constructor? |
Yes. The equal sign provides assignment of a default argument. i.e. If yearsFrom() is called with no argument, the Date() constructor provides the current date (per the comments) and assigns the value to the argument d.
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http://www.cplusplus.com/articles/jEywvCM9/
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