Other way would be using prototypes. In this case you should write it like this. 
# instead of
# sub print_graph
# try this
sub print_graph (\@\@$$)

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This also helps, to make sure your calls to this subroutine are correct. Also your scalars would come as scalars to get them as references add '\' infront of '$'.

In reply to Re: passing multiple items to a subroutine by Hena
in thread passing multiple items to a subroutine by tommycahir

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