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static initialization of array of objects

Posted on 2002-05-03
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Last Modified: 2010-04-02
I have 2 questions

1. Just a thought,  Does it make sense in having ch -- an array of one char.

     char ch[1];


2. static initialization of array of objects
   
#include <iostream.h>
class ABC {
 int i;
public:
 ABC(i)
 {
  cout << i << endl;
 }
};  // end of class ABC
 

void main()
{
     ABC a[5] = {1,2,3,4,5};
   // whats the problem in static initialization of
   //array of objects like this.
}
0
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Question by:rv_san
6 Comments
 
LVL 86

Accepted Solution

by:
jkr earned 200 total points
ID: 6988454
It will work if you make it read

ABC a[5] = { ABC(1), ABC(2), ABC(3), ABC(4), ABC(5)};

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LVL 86

Expert Comment

by:jkr
ID: 6988458
>>Does it make sense in having ch -- an array of one char.
>>    char ch[1];

That depends on what you want to do with it...
0
 

Author Comment

by:rv_san
ID: 6990812
ABC a[5] = {ABC(1),ABC(2),ABC(3),ABC(4),ABC(5)};

works fine. Thanks


Secondly, regarding char ch[1], I was wondering if I use "char ch[1]" as an array then the array space will be used only to store '\0'  Is there any practical situation where I must have to use "char ch[1]"  only.
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LVL 2

Expert Comment

by:mirtol
ID: 7012600
Nope.

The only use for defining an array of 1 unit is if you want the compiler to treat the variable as an array when you don't actually know how big it will be.

For example:

struct somepacket {
    int     somevar;
    ...
    int     datalength;
    char    data[1];
}

This way, you can reference the data in you code as an array very easily.

In any other case, you can always reference the single char variable.
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Expert Comment

by:griessh
ID: 7178496
Dear rv_san

I think you forgot this question. I will ask Community Support to close it unless you finalize it within 7 days. You can always request to keep this question open. But remember, experts can only help you if you provide feedback to their questions.
Unless there is objection or further activity,  I will suggest to accept

     "jkr"

comment(s) as an answer.

If you think your question was not answered at all, you can explain here why you want to do this and post a request in Community support (please include this link) to refund your points. The link to the Community Support area is: http://www.experts-exchange.com/commspt/


PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!
======
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LVL 6

Expert Comment

by:Mindphaser
ID: 7199741
Force accepted

** Mindphaser - Community Support Moderator **
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