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    switch ($opcode)
    {  
        'add' { print "\n The opcode reported was add with hex value 4
+"; }
        'sub' { print "\n The opcode reported was sub with hex value 5
+"; }
    }

syntax error at ./assembly2hex.pl line 21, near "'add' { "
syntax error at ./assembly2hex.pl line 22, near "'sub' { "

#!/usr/bin/perl

...
    }

}