I have seen /* block comment */ for block commenting in C++. I know I can do line commenting by using ! or c, but is there any option for block commenting in Fortran?
No, the strange concept of block comments is alien to Fortran. Your editor or development environment might provide a way to comment a block of lines in one go.
You can do a little hack though:
go to 100
! CHUNK OF CODE YOU WANT TO COMMENT OUT
100 continue
Yeah, I know it's horrible but it works. :)
If your FORTRAN compiler supports preprocessor macros then a popular method is to use (What exactly does an #if 0 ..... #endif block do?)
#if 0
...
Your comments ...
go here ...
...
#endif
A line with a c, C, *, d, D, or! in column one is a comment line; except that if the -xld option is set, then the lines starting with D or d are compiled as debug lines. The d, D, and! are nonstandard.
If you put an exclamation mark (!) in any column of the statement field, except within character literals, then everything after the ! on that line is a comment.
In Sublime text editor it can be used Toggle Comment (Ctrl+7) or Toggle Block Comment.
来源：https://stackoverflow.com/questions/22049963/how-to-do-block-comment-in-fortran