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From: "jimmaureenrogers@worldnet.att.net" <jimmaureenrogers@worldnet.att.net>
Newsgroups: comp.lang.ada
Subject: Re: Char type verification
Date: 15 Nov 2006 17:08:53 -0800
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Date: 2006-11-15T17:08:53-08:00
List-Id: <comp.lang.ada>

This is an awful piece of code because it must perform a number
of conversions between character and numeric values. Nonetheless,
I believe I have produced a transliteration of the C into Ada, with the
addition of dealing with the first character of each value on the
command
line, not just the first value.

--Assume that I have the following C code:

--#include <stdio.h>

--#define uchar   unsigned char

--static uchar UCASE[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";

--int _isupper(uchar c)
--{
--   return (c==UCASE[(c%'A')%26]);

--}

--int main(int argc, char *argv[])
--{
--    uchar c = (uchar) *argv[1];
--    printf("_isupper('%c')? = %d\n",c,_isupper(c));

--    return 0;

--}

with Ada.Text_Io;
with Ada.Command_Line;

procedure Simulate_Uchar is
   type Uchar is mod 256;

   function Is_Upper(Item : in Uchar) return Boolean is
      subtype Char_Index is Positive range 1..26;
   begin
      return ((1 + Character'Pos(Character'Val(Positive(Item))) -
Character'Pos('A')) in Char_Index);
   end Is_Upper;
   Input : Character;
   U_Input : Uchar;
begin

   for N in 1..Ada.Command_Line.Argument_Count loop
      Input := Ada.Command_Line.Argument(N)(1);
      U_Input := Uchar(Character'Pos(Input));
      Ada.Text_Io.Put("Is_Upper(" & Uchar'Image(U_Input) & ")? = ");
      Ada.Text_IO.Put_Line(Boolean'Image(Is_Upper(U_Input)) );
   end loop;
end Simulate_Uchar;

Jim Rogers