Default value in struct field when instance it

Question

I've just started to learn C++.

I have this struct:

struct dateTime
{
    int sec;
    int min;
    int hour;
    int day;
    int mon;
    int year;
    bool daylightSaving;
    char timeZone;
};

And I need to set daylightSaving to false by default.

How can I do it? Maybe I have to use a class instead of a struct.

struct and class are the same thing in c++, just different defaults. — Thomas
– Thomas, Commented Dec 15, 2019 at 18:55

VansFannel · Accepted Answer · 2019-12-16 14:20:16Z

3

You can write for example

struct dateTime
{
    int sec;
    int min;
    int hour;
    int day;
    int mon;
    int year;
    bool daylightSaving = false;
    char timeZone;
};

edited Dec 16, 2019 at 14:20

VansFannel

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answered Dec 15, 2019 at 18:54

Vlad from Moscow

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Comments

Cyborg-X1 · Accepted Answer · 2019-12-15 19:02:25Z

1

So you say in C++, what about having a default constructor initializing all values?

struct dateTime
{
 dateTime()
 : sec(0)
 , min(0)
 , hour(0)
 , day(0)
 , mon(0)
 , year(0)
 , daylightSaving(false)
 , timeZone('a') //Are you sure you just want one character? time zones have multiple... UTC GMT ...
 {}

...
}

You can use a class instead, but the difference is only that all values are private by default. So you need

class ...
{
   public:
   ...
}

to have the same behavior as with the struct.

answered Dec 15, 2019 at 19:02

Cyborg-X1

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1 Comment

VansFannel Over a year ago

I’m using a char to store a value between-127 and 127 (forget the unsigned, is a mistake).

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