Re: Standard pre-processing ?

David Flower wrote:
kis wrote:

Hi,

I use CVF 6.6 editor to write Fortran code and want to comment out (put
" ! or C " at the beginning of) hundreds of lines. Is there an easy
way to do that? What I did so far is to put the comment signs line by
line; very tedious and time consuming. FYI, in MATLAB (6.0 or higher),
simply block the lines that need to be commented out and press CTRL+R
simultaneously. All the blocked lines will be commented out (with %
sign).

Look forward to kind help.

Irfan


I am aware of at least three non-standard pre-processor command formats
(C, DEC, Salford).

Is there anything proposed, or implemented, in the standards ?

Dave Flower

Most Fortran compilers include a built-in compile flag for a C preprocessor. This allows you to comment out a large block with:
#if 0
....
#endif

For inserting actual Fortran comments, you could use gVim: highlight a block, then do :s/^/!/
which means substitute beginning-of-line with '!'. The beginning-of-line is zero-width, so it;s really an insert.

COCO is an 'official' preprocessor, an actual ISO standard. However, it never has caught on, probably because the C preprocessor (in traditional mode) was already very common. Also, the are several FPP's, which are just C preprocessors that are better at handling Fortran source.

There is also a Perl-based preprocessor, fpx3. It is overkill for most users, but can also do simple cpp-like code exclusions.

Joe
.

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