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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
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6 Comments
 
LVL 86

Accepted Solution

by:
jkr earned 50 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)};

0
 
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"

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Expert Comment

by:Mindphaser
ID: 7199741
Force accepted

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