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From: Martin <martin@thedowies.com>
Newsgroups: comp.lang.ada
Subject: Re: condition true or false? ->  (-1 < sizeof("test"))
Date: Tue, 22 May 2012 01:00:56 -0700 (PDT)
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Date: 2012-05-22T01:00:56-07:00
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On Tuesday, May 22, 2012 7:11:54 AM UTC+1, Nomen Nescio wrote:
> glen herrmannsfeldt <gah@xxxx.yyyyyyy.zzz> wrote:
> 
[snip]
> 
> I'm not an expert on this but Ada is very strongly (statically) typed.

> There
> are only two integer types in Ada to start with, signed integer and modular
> integer.

This bit isn't right.


> The compiler will flag an error if you try to compare variables of
> those two types or indeed variables of any differing types. You can define
> subtypes of existing types and completely new types and Ada insures you
> can't make mistakes by mixing apples and oranges. While this is a bit
> confining at times (when you know it's ok to do so) it does preclude the
> possibility of something like what Bartc wrote from ever happening.

> If you
> know the conversion is ok there are ways (usually by providing an unchecked
> conversion function) to assign or compare across types.

And this bit isn't quiet right - unchecked conversions are really a technique of last resort!

But apart from that the gist of what you say is - Ada does help prevent silly (and not so silly) mistakes.

Ada typing is easily the richest I know of (see http://en.wikibooks.org/wiki/Ada_Programming/Type_System#The_Type_Hierarchy).

-- Martin