Re: From_string(Arg : String) return Big_Integer

[soren rundgren <soren.m.rundgren@gmail.com>]

lördag 9 januari 2021 kl. 18:00:36 UTC+1 skrev AdaMagica:
> Since Ada 202X is not yet released, this package is not yet fully implemented. (I had a conversation with AdaCore about a similar case a year ago.)

I managed to make a very basic solution by creating my own:

   function My_From_String(S : String) return Big_Integer is
      sum : Big_Integer := 0;
      Len : constant Integer := S'Length;
      i : Integer := 1;
   begin
      -- Ada.Text_IO.Put_Line("My_From_String.S = " & S);
      while i <= Len loop
         case S(i) is -- i = Len : Len - Len = 0,
                      -- i = 1 : Len - 1
            when '1' => sum := sum + 1*10**(Len - i);
            when '2' => sum := sum + 2*10**(Len - i);
            when '3' => sum := sum + 3*10**(Len - i);
            when '4' => sum := sum + 4*10**(Len - i);
            when '5' => sum := sum + 5*10**(Len - i);
            when '6' => sum := sum + 6*10**(Len - i);
            when '7' => sum := sum + 7*10**(Len - i);
            when '8' => sum := sum + 8*10**(Len - i);
            when '9' => sum := sum + 9*10**(Len - i);
            when others => null;
         end case;
         i := i + 1;
      end loop;
      return sum;
   end My_From_String;