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program line_continuation_02
implicit none
! Here are the rules for & based on the ยง 6.3.2.4 ("Free form statement
! continuation") in Fortran 2018 standard.
! The & character in a comment has no effect
! The & character can be used to continue a line like this:
integer &
:: j
! If it is used between tokens, then one can, but does not have to put another &
! on the next line:
integer &
&:: k
! If & is used to continue the line in the middle of a token, one must put
! another & at the next line:
inte&
&ger :: i
i = 5
pr&
&i&
&nt *, i
! One can continue strings also by treating them as tokens:
print *, "some string &
&is continued"
! Unless the & is at the end of the line, it can be used as a regular
! character in a string:
print *, "some string can contain & as a regular character &
&is continued"
print *, "Even here: &&
&& <- there will be two &"
! One can put arbitrary comments and empty lines after & that will be skipped:
print *, &
i
print *, & ! comment 1
! comment 2
! comment 3
i
print *, & ! comment 1
! comment 2
! comment 3
&i
! In strings the comment cannot be after the first &, but it can be on
! subsequent lines:
print *, "some string &
! comment 2
! comment 3
&is continued"
end program
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