Manual Reference Pages - continue (7fortran)

NAME

CONTINUE(7) - [EXECUTION_CONTROL] execution of a CONTINUE statement has no effect

SYNOPSIS

[NNNNN] continue

DESCRIPTION

It is generally very confusing to have executable statements on labeled lines; a CONTINUE statement eliminates the ambiguities that arise in jumping to an executable line. Specifically:

o Execution of a CONTINUE statement has no effect.

o Preferably no target of a transfer should be an executable statement.

o Therefore, all numerically labeled executable lines should be a CONTINUE.

A CONTINUE statement is most often used as a target for transfer control statements such as GOTO. That is, a numeric label is added to the line.
CONTINUE(7f) is rarely used in new code but was very commonly encountered in older FORTRAN code before the advent of constructs like ENDDO, CYCLE, BLOCK, and EXIT.

EXAMPLES

Sample program:

    >      program oldstyle
    >      integer i,j
    >      j=5
    >      do 100 i=1,20
    >         if(i.lt.5)goto 100
    >         j=3
    >100   write(*,*)’J=’,j
    >      end

    program demo_continue
    ! numbered targets should (almost?) always be a continue statement
    ! with a unique label for each looping structure
    integer :: i,j
      j=5
      do 100 i=1,20
         if(i.lt.5)goto 50
         j=3
         50 continue
         write(*,*)’J=’,j
      100 continue
    end program demo_continue

    program newer
    implicit none
    integer :: i,j
       j=5
       do i=1,20
          if(i >= 5)then
             j=3
          endif
          write(*,*)’J=’,j
       enddo
    end program newer

Fortran statement descriptions (license: MIT) @urbanjost

Nemo Release 3.1

continue (7fortran)

August 19, 2024

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o	Execution of a CONTINUE statement has no effect.
o	Preferably no target of a transfer should be an executable statement.
o	Therefore, all numerically labeled executable lines should be a CONTINUE.