Re: is this a mistake in the book or ...

[anon@att.net]

Since your using GNAT compiler 

  Specification files must have extension ".ads"
  while the body is extension ".adb"

  
In <f169bcf2-5558-4e2e-acf5-7bf887a1032c@googlegroups.com>, gdotone@gmail.com writes:
>The following coming from Ada 95 Problem Solving and Program
>Design p.121
>
>Program 3.8 Specification for Screen Package
>----------------------------------------------------------------------
>
>Package Screen is
>----------------------------------------------------------------------
>-- | Procedure for drawing pictures on ANSI Terminal Screen
>-- | Author: Michael B. Feldman, The George Washington University
>-- | Last Modified: July 1995
>----------------------------------------------------------------------
>
>   -- constants: the number of rows and columns on the terminal
>
>   Screen_Depth : constant Integer := 24;
>   Screen_Width : constant Integer := 80;
>
>   -- subtypes giving the ranges of acceptable inputs
>   -- to the cursor-positioning operation
>
>   subtype Depth is Integer range 1..Screen_Depth;
>   subtype Width is Integer range 1..Screen_Width;
>
>   procedure Beep;
>   -- Pre:  None;
>   -- Post: Terminal makes its beep sound once
>
>   procedure ClearScreen;
>   -- Pre:  None
>   -- Post: Terminal Screen is cleared
>
>   procedure MoveCursor (Column : Width; Row : Depth);
>   -- Pre:  Column and Row have been assigned in-range value
>   -- Post: Cursor is moved to the given spot on the screen
>
>End Screen;
>
>when i compile this using gnatmake -gnatl Screen.adb
>
>i get an error message: >>> keyword "Body" expected here [see file name]
>and a pointer to the location right after Package and before Screen
>
>are package specification able to be compiled without the body?
>and or how do i compile this?
>
>in program 3.9 p 122 Body of Screen Package
>i do see
>
>PACKAGE BODY Screen is ...
>
>so do they need to be compiled together?
>if so, how do i do that?