How to initialize and allocate memory for an array in a struct in header file?

Question

My question is like this, there is a struct data in test.h

struct data {
static int year[10];
static int month[12];
static int day[31];
};

In Cpp file, I have several functions which need to call it. Where and how should I initialize it?

void test::display(){
     struct data pointer;
     /* ... */
     // These three arrays should be initialized
     pointer.year[index1] = Timeyear;
     pointer.month[index2] = Timemonth;
     pointer.day[index3] = Timeday;
     printf("%d %d %d", pointer.year[index1],
         pointer.month[index2], pointer.day[index3]);
     /* ... */
}

I'm confused by the name `pointer` -- are you actually passing around a _pointer_ to a block of memory of type `struct data` or is that just the first name that came to mind? — sarnold, Jan 18 '12 at 00:46
first of all, using 31 ints to store a day seems like an awful waste of space. second of all, if this is C++, you can just initialize them in a constructor. — Daniel Kamil Kozar, Jan 18 '12 at 00:46
@sarnold Sorry for that. It is just a name, the name of struct object. — Networker, Jan 18 '12 at 00:48
@Daniel Could you please give some details? I try to do it in constructor, but not successful. — Networker, Jan 18 '12 at 03:13

score 3 · Answer 1 · answered Jan 18 '12 at 00:50

3

You appear to be very confused between C and C++.

printf? It's bad. Really bad. struct data pointer? Ditch the struct.

Also, if you want to initialize it, just use a constructor.

answered Jan 18 '12 at 00:50

Puppy

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I put "int data::year[] = 0;" into the constructor, but it has an error "invalid use of qualified-name ‘data::year’" when compile it. – Networker Jan 18 '12 at 03:10

score 0 · Answer 2 · edited May 23 '17 at 11:48

0

I think your problem has already been taken care of by the STL.

You should learn more about std::time_t objects

How to initialize and allocate memory for an array in a struct in header file?

2 Answers2