in reply to Subroutine help

  1. put code in <code> code here </code> tags
  2. copy/paste error message
  3. function calls do not work inside strings, they don't interpolate like variables, so 
    printf "Equals to: %s\n", add();

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  4. @_ is an array, so just iterate over it 
    my $sum = 0;
foreach(@_){
   $sum += $_;
}

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