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string operation II

Posted on 2007-04-09
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Last Modified: 2010-03-05
I am using :
@string =  ('0x01');
$string[2] = ('0x03');
$string[3] = ('0x04');

local $"=",";
$string_value = "{0x05,0x06,@string}";
print $string_value;

Output :
{0x05,0x060x01,,0x03,0x04}  # I am getting 2 single quotes
           
With Warning :
use of uninitialize value in join or string
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Comment
Question by:gauravflame
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4 Comments
 

Author Comment

by:gauravflame
ID: 18880656
any comments
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LVL 84

Accepted Solution

by:
ozo earned 500 total points
ID: 18880665
You did not define $string[1] so there is an empty string where it would go
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Author Comment

by:gauravflame
ID: 18880691
That's right ...
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LVL 84

Expert Comment

by:ozo
ID: 18880699
and since it is undefined, trying to use it in join$",@string gives a warning
splain                                            
/usr/bin/splain: Reading from STDIN
Use of uninitialized value in join or string
Use of uninitialized value in join or string (#1)
    (W uninitialized) An undefined value was used as if it were already
    defined.  It was interpreted as a "" or a 0, but maybe it was a mistake.
    To suppress this warning assign a defined value to your variables.
   
    To help you figure out what was undefined, perl tells you what operation
    you used the undefined value in.  Note, however, that perl optimizes your
    program and the operation displayed in the warning may not necessarily
    appear literally in your program.  For example, "that $foo" is
    usually optimized into "that " . $foo, and the warning will refer to
    the concatenation (.) operator, even though there is no . in your
    program.
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