my %ARG = (
   5 => "ADD ENTRY TO DATABASE",
   6 => "ADD ENTRY TO REG FILE",
   7 => "SHOW DEBUG MSG",
);

foreach $k in (5,6,7) {
{ 
     if ...
     {
      } else 
      { 
             print "$ARG{$k} entry invalid\n" ;      
       }
}