INCLAN: do: Difference between revisions

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== Synopsis ==


Usage: do [''variable'' ''start'' ''end'' [''step'']] [parallel [continue]]
'''do'''
        .
:...
        .
'''end do'''
      end do


The statement "do" executes a loop within a macro. Without parameters
'''do''' ''variable'' ''start'' ''end'' [''step''] [''parallel'' [''continue'']]
the loop is executed unconditionally, i.e. until one of the statements
:...
break, exit, quit or return is encountered. "do" followed by parameters
'''end do'''
executes a FORTRAN-77 do-loop within a macro. The loop counter
variable and the integer expressions start, end, and step have the
usual meaning. Parallel loops are executed in parallel on nproc
processors (see variable nproc). If the keyword "continue" is
present, the program continues immediately with the execution of the
next statement after the parallel loop. Otherwise, the next statement
after the loop is executed when the parallel loop is finished.


== Description ==


Examples: do
Executes a loop within a macro. Without parameters the loop is executed unconditionally, i.e. until one of the statements [[INCLAN: break|break]], [[INCLAN: exit|exit]], [[INCLAN: quit|quit]] or [[INCLAN: return|return]] is encountered.  
            if (filename.eq.''' ''') break
            .
            .
          end do


          do i 1 10
'''do''' followed by parameters executes a FORTRAN-style do-loop within a macro. The loop counter ''variable'' and the integer expressions ''start'', ''end'', and ''step'' have the usual meaning. Parallel loops are executed in parallel on [[INCLAN: nproc|nproc]] processors.
            print "Iteration $i."
 
          end do
If the keyword '''continue''' is present, the program continues immediately with the execution of the next statement after the parallel loop. Otherwise, the next statement after the loop is executed when the parallel loop is finished.
 
== Examples ==
 
do
  if (filename.eq.' ') break
    .
    .
end do
 
do i 1 10
  print "Iteration $i."
end do
 
== See also ==
 
[[INCLAN:end do|end do]]

Revision as of 23:14, 18 February 2009

Synopsis

do

...

end do

do variable start end [step] [parallel [continue]]

...

end do

Description

Executes a loop within a macro. Without parameters the loop is executed unconditionally, i.e. until one of the statements break, exit, quit or return is encountered.

do followed by parameters executes a FORTRAN-style do-loop within a macro. The loop counter variable and the integer expressions start, end, and step have the usual meaning. Parallel loops are executed in parallel on nproc processors.

If the keyword continue is present, the program continues immediately with the execution of the next statement after the parallel loop. Otherwise, the next statement after the loop is executed when the parallel loop is finished.

Examples

do
  if (filename.eq.' ') break
    .
    .
end do

do i 1 10
  print "Iteration $i."
end do

See also

end do

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