INCLAN: do: Difference between revisions
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'''do''' | '''do''' | ||
: | :''sequence of statements'' | ||
'''end do''' | '''end do''' | ||
or | |||
'''do''' ''variable'' ''start'' ''end'' [''step''] [''parallel'' [''continue'']] | '''do''' ''variable'' ''start'' ''end'' [''step''] [''parallel'' [''continue'']] | ||
: | :''sequence of statements'' | ||
'''end do''' | '''end do''' | ||
| Line 14: | Line 16: | ||
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. | 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. | ||
'''do''' followed by parameters executes a FORTRAN- | '''do''' followed by parameters 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 [[INCLAN: nproc|'''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. | ||
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 == | == Examples == | ||
do | |||
if (filename.eq.' ') break | |||
. | |||
. | |||
end do | |||
do i 1 10 | |||
print "Iteration $i." | |||
end do | |||
== See also == | == See also == | ||
[[INCLAN: nproc|nproc]] | [[INCLAN: nproc|nproc]] | ||
Latest revision as of 14:33, 13 August 2009
Synopsis
do
- sequence of statements
end do
or
do variable start end [step] [parallel [continue]]
- sequence of statements
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-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. 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