Hi Monks 
#!/user/bin/perl -w
upper($1,$2);
sub upper 
{
  for(@_)
   {
     tr/a-z/A-Z/;
    }
}

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I am trying to modify the nameless farmal arguments to actual arguments ,the above code is giving an error as "modification to readonly value attempted".so,suggest me so,that i can trap my mistake.

In reply to How to modify the actual arguments by perladdict

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