[r6rs-discuss] string->number

[Vincent Manis]

On 2009-03-24, at 22:18, John Cowan wrote:

>
> Vincent Manis scripsit:
>
>> This raises an interesting point. Perhaps there are language  
>> standards
>> that have no implementation-defined behavior. I have certainly never
>> seen one.
>
> ES 3.1 is attempting to reach the stage where there is no *explicitly*
> undefined behavior.  The same is true of Java.  There may, of course,
> be undefined behavior as a result of overlooked points.  For example,
> it is not explicitly prescribed by ES 3.1 that evaluating arithmetic
> expressions cannot have side effects.

In many cases, the implementation dependencies are rather  subtle. For
example, most programming language implementations define math
routines by calling the corresponding routines in the C library. Of  
course,
one can say that accuracy and error behavior are `unspecified', rather
than `implementation-dependent'.

-- v