Re: Programming language and IDE design

From: "George Neuner" <gneuner2@comcast.net>
Sent: Tuesday, November 19, 2013 11:02 AM


> AFAIK, Fortran's DO loop requires the most lookahead of any of the
> classic language features: LL(4) [if I'm counting correctly].
>
> 10DOI=42
> 10DOI=42,45


The statements are
        DO 10 I = 42
        DO 10 I = 42, 45


> Card Fortran didn't require whitespace separation.


Still doesn't, though since the advent of Fortran 90,
an alternative free source form requires a space between the syntactic elements,
so the difficulty doesn't arise. Nor, can the "classic" (apocryphal?) error
DO10I=42.45
occur (assuming that declarations are made compulsory with the statement
IMPLICIT NONE).

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