3/23/2015 Fortran/FortranstructureandstyleWikibooks,openbooksforanopenworld

http://en.wikibooks.org/wiki/Fortran/Fortran_structure_and_style 1/1

Fortran/FortranstructureandstyleStyle

OlderversionsofFortranhadstrictguidelinesonhowaprogramwasformatted.Howevernewversions,especiallyFortran90andabovehavemodernized,allowingmoreflexibility.

OriginallyFortranrequiredallstatementstobeinALLCAPS,andinfactthelanguageitselfwascalledFORTRAN(incaps).Itremainsabitcustomary,thoughcompletelyunnecessary,toputFortrancommandsinALLCAPS.

PROGRAMtestIMPLICITNONEINTEGERfourfour=4WRITE(*,*)fourENDPROGRAM

Whitespaceandemptylinesusuallywon'tmatterinF90orabove,butinrarecaseserrorswillpopup.However,unlikemanyotherlanguagessuchasC,C++,andJava,thelinedelimiter''isoptional,soeachlineofcodemaystayonitsownline!

Structure

ThereisaGOTOcommand,butdon'tuseittoomuch.UseDOloopsearlyandoften.Encapsulateyourcodeintofunctionsandsubroutinesmakingiteasiertoprogramathigherlevels,andallowingotherstounderstandwhatsgoingon.Commentyourcodewell.Don'tcommenteveryline,butexplainhoweverythingworks.

Retrievedfrom"http://en.wikibooks.org/w/index.php?title=Fortran/Fortran_structure_and_style&oldid=2124554"

Thispagewaslastmodifiedon23June2011,at00:42.TextisavailableundertheCreativeCommonsAttributionShareAlikeLicense.additionaltermsmayapply.Byusingthissite,youagreetotheTermsofUseandPrivacyPolicy.

http://creativecommons.org/licenses/by-sa/3.0/http://wikimediafoundation.org/wiki/Privacy_policyhttp://wikimediafoundation.org/wiki/Terms_of_Usehttp://en.wikibooks.org/w/index.php?title=Fortran/Fortran_structure_and_style&oldid=2124554