[svlug] Re: Embedded C++

[Karl Larsen]

On Wed, 17 Sep 2003, Rick Kwan wrote:

> David Christensen wrote:
> 
>  >Rick Kwan wrote:
>  >
>  >>> I had a discussion with an embedded systems developer about
>  >>> strengths and weaknesses of C, C++, Ada, and Java in an
>  >>> embedded environment.
> 
> 
> I also hear that many in the Ada community consider going from Ada
> to C++ a dangerous move, both from a safety and an engineering
> productivity perspective.  The poster child for this is:
>          if (a = b) c = d;
> which is legal C/C++ but ought to be

	This was taught to me in basic C programing. NEVER enclose an 
equal sign!!! You do it this way:

	if 
	{
	a=b;
	then a*c = d;
	else d = 1;
	}

This I made long so you can see whats happening.


>          if (a == b) c = d;
> and is written in Ada as
>          if a = b then c := d end if;

	I do not understand ada but that looks wrong....

> 
> A few years ago, DoD dropped the requirement that embedded software
> be written in Ada.  Prime contractors are now expected to apply
> their professional judgement.  Many are moving from Ada to C++ or
> Java (whenever the real-time core is firmed up).
> 
> Just to put this in perspective, the Boeing 777 has 4 million lines
> of software and uses 1280 embedded processors.  (Source:
> http://www.aiaa.org/jacic)  I gathered from somewhere (that now
> slips my mind) that all of this is written in Ada.
> 
> --Rick Kwan
> 
> 
> 
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-- 
                      
               - Karl Larsen k5di Las Cruces,NM Az ScQRPions -