Comment (computer programming): Difference between revisions

Revision as of 14:29, 11 January 2025

Revision as of 14:35, 11 January 2025

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</syntaxhighlight>

====Fortran IV====

ThisThe following [[Fortran IV]] code fragment demonstrates how comments are used inshows that language,comment whichsyntax is very column-oriented. A letter "<code>C"</code> in columnthe 1first column causes the entire line to be treated as a comment.

<syntaxhighlight lang="fortranfixed">

C

C Lines that beginbeginning with 'C' (in the first or(a.k.a. 'comment') column) are comments

C

WRITE (6,610)

Line 627:

</syntaxhighlight>

The following [[Fortran|Fortran 90]] code fragment shows a more modern line comment syntax; text following <code>!</code>.

Note that the columns of a line are otherwise treated as four fields: 1 to 5 is the label field, 6 causes the line to be taken as a continuation of the previous statement; and declarations and statements go in 7 to 72.

====Fortran 90====

This [[Fortran]] code fragment demonstrates how comments are used in that language, with the comments themselves describing the basic formatting rules.

<syntaxhighlight lang="Fortran">

! A comment

!* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

!* All characters after an exclamation mark are considered as comments *

!* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

program comment_test

print '(A)', 'Hello world' ! Fortranalso 90a introduced the option for inline comments.comment

end program

</syntaxhighlight>