Using comments in input files

[raghu81]

Hello everyone,
I am writing some programs in GFortran for educational purposes. For some programs, the input files have a lot of data and I like to mark them with comments using special symbols for ex., "#"

Can any one suggest me a way to make the program ignore the comment line which is followed by the special symbol?

For example,

#Matrix size ---comment line-----
3
#Number of rotations ---comment line-----
10
#Matrix elements ---comment line-----
1 1 1
1 1 1
1 1 1

Thanx in advance,
Raghu.

 

[xwb]

Read the line twice: once into a string and then from the string

character*80:: line
integer:: matsize, matrot
...

open (20, ...

call skipcomments (20, line)
read (line, *) matsize
call skipcomments (20, line)
read (line, *) matrot
...
close (20)
stop
end

subroutine skipcomments (chan, line)
   integer, intent(in):: chan
   character*80, intent(inout):: line

10 continue
   read (chan, *) line
   if (line(1:1) .eq. '#') goto 10
   return
end subroutine skipcomments

 

[raghu81]

Hi xwb,

Thanx for ur method. It works very well.

-regards,
raghu

 

[minger88]

Likewise you could just put your comments after the variable. Mine usually look like:

2.0 ! constant 1
4 ! constant 2
.true. ! constant 3

etc