On Thu, 26 May 2005, John Ferrell wrote:

> I have learned a lot from that book and I expect I will learn more...
> I have come to believe there is no such thing as "error free" in this world.
>
> John Ferrell
> http://DixieNC.US
>
>> I agree with you - I was disappointed with the number of errors in that 
>> book.  I bought the first edition for the guys here at my shop - and was 
>> unhappy enough not to purchase the second edition.  Looks as if that may 
>> have been the right choice.

According to the article about the Shuttle software posted on this list 
earlier (and also according to figures from books) the expected error 
rate for software is about 1% (reported to the number of lines of code). 
This is not the number of typos, it is the number of logic errors. I 
tend to agree with this number. It follows that if the book shows 1000 
lines of code and 1000 clauses (say, logical statements about bit 
functions and so on) it should have about 10 errors in each group (and 
the errors in the clauses are harder to catch because there is no easy 
way to compile the clauses).

Peter
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