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can I initialize member like this?

Posted on 1997-11-12
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Last Modified: 2010-04-10
here is what I did:

class Date {
  private:
    int day;     // Stores the day, 1-31.
    int month; // Stores the month, 1 -12.
    int year;  // Stores the year.  Any by size of int.

    // List of months for converting to a value.
    char months[] = 3D { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug",
                        "Sep", "Oct", "Nov", "Dec"};
  public:
    Date();
    Date(char *d);
    //{  // Constructor with the string for part 2.
    //  setDate(d);
    //}
    void setDate(const char *d);
    char *getDate() const;class Date {
  private:
    int day;     // Stores the day, 1-31.
    int month; // Stores the month, 1 -12.
    int year;  // Stores the year.  Any by size of int.

    // List of months for converting to a value.
    char months[] = 3D { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug",
                        "Sep", "Oct", "Nov", "Dec"};
  public:
    Date(char *d);
    {  // Constructor with the string for part 2.
      setDate(d);
    }
    void setDate(const char *d);
    char *getDate() const;
...
};

I got an error msg: Can't initialize a member here.
on the line of char months[] = 3D {...};

why?

Thank you
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Question by:calprcr
  • 3
5 Comments
 
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Accepted Solution

by:
Hardaway earned 0 total points
ID: 1173036
What do you mean by 3D??

I think the correct way is like the following :
char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};

"Jan" is a string rather than a character.
4 instead of 3 because of a string separator.
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Author Comment

by:calprcr
ID: 1173037
I got rid of 3D and do what you gave me. I still got the error msg.


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LVL 22

Expert Comment

by:nietod
ID: 1173038
Hardaway's answer is syntaclly right to initialize an array.  But you can't initialize an array that is a class/structure member.  (or you can, but you must do it in the constructor.)

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LVL 22

Expert Comment

by:nietod
ID: 1173039
Actually, I think the "real" problem is that you don't want the array to be a member, or if you do, you want it to be a static member.  The way it is not, as a non-static member, each data object will have its own (private, seperate) copy of the months array.  That is probably a waste.  You can either declare it global or static.  (Static will produce one copy that is shared among all the date objects).
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LVL 22

Expert Comment

by:nietod
ID: 1173040
Also multi-dimentional arrays in C++ are kinda weak.  I avoid them if I can.  For this kind of table, an array of character pointers usually works best.  Like

const char *Months = {"Jan","Feb",Mar"};

one advantage of this is that the strings can be different lengths, like

const char *Months = {"January","February",March"};

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