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Motivation
IntroductoryFortranProgramming
GunnarWollan
DepartmentofGeosciences
UniversityofOslo,N-0315Oslo,Norway
Spring2005
Motivation
Motivation
1Motivation
Motivation
AboutFortran77and95
Contents
FileI/O
Arraysandloops
Detailedexplanationofmodules
Computationaleciencyaspects
Usingmodulesasobjects
ThepromiseofFortran2003
Motivation
AboutFortran77and95
Requiredbackground
InterestinnumericalcomputingusingFortran
ofthecomputerMotivation
AboutFortran77and95
AboutlearningFortran
Fortran95
youarefamiliarwiththedetailsFourdayscanonlygetyoustarted
language havesomeknowledgeofitMotivation
AboutFortran77and95
Teachingphilosophy
Intensivecourse
Lectures9-12
Hands-ontraining13-16
Learnformdissectingexamples
Getintouchwiththedirtywork
Getsomeoverviewofadvancestopics
Focusonprinciplesandgenericstrategies
Continuedlearningonindividualbasis
projectsMotivation
AboutFortran77and95
recommendedattidudeDiveintoexecutableexamples
Don'ttrytounderstandeverything
Trytoadaptexamplestonewproblems
Learnondemand
Keepacoolhead
willlastMotivation
AboutFortran77and95
AboutFortran77and95
2AboutFortran77and95
AboutFortran77and95
IntrotoFortran77programming
Fortran77
dominatinglanguagefornumbercrunching earlyeighties. languagehasevolvedovertime. syntaxAboutFortran77and95
IntrotoFortran77programming
Fortran95
Fortran95extendsFortran77with
Nicersyntax,freeformatinsteadofxedformat
UserdeneddatatypesusingtheTYPEdeclaraion
declarationsFortran77isasubsetoffortran95
AboutFortran77and95
IntrotoFortran77programming
Fortranversusotherlanguages
C++isasupersetofCandmorereliable
JavaissimplerandmorereliablethanC++
Pythonismorehigh-levelthanJava
AboutFortran77and95
IntrotoFortran77programming
SpeedofFortranversusotherlanguages
Fortran77isregardedasveryfast
Cyieldslightlyslowercode
C++andfortran95areslowerthanFortran77
Javaismuchslower
AboutFortran77and95
IntrotoFortran77programming
Someguidelines
functionswherespeediscritical e.g.Fortran,PythonandC++Usethelanguagebestsuitedforyourproblem
AboutFortran77and95
IntrotoFortran77programming
IntrotoFortran77programming
3IntrotoFortran77programming
IntrotoFortran77programming
IntrotoFortran95programming
OurrstFortran77program
Implementation
Withoutdeclaringastring
Withstringdeclaration
IntrotoFortran77programming
IntrotoFortran95programming
Withoutdeclaringastringvariable
C234567
PROGRAMhw1
WRITE(*,*)'HelloWorld'
ENDPROGRAMhw1
IntrotoFortran77programming
IntrotoFortran95programming
Withdeclaringastringvariable
C234567
PROGRAMhw1
CHARACTER*11str
WRITE(*,*)str
ENDPROGRAMhw1
IntrotoFortran77programming
IntrotoFortran95programming
Somecommentstothe\HelloWorld"program
Fortran77usesxedformat
thecomputerwasbypunchedcards therestofthelineisacommentThecolumn7to72isforthesourcecode
Column73to80isforcomments
IntrotoFortran77programming
IntrotoFortran95programming
IntrotoFortran95programming
4IntrotoFortran95programming
IntrotoFortran95programming
CompilingandlinkingFortranprograms
ScienticHelloWorldinFortran95
Usage:
./hw12.3Outputoftheprogramhw1
Hello,World!sin(2.3)=0.745705
Whattolearn
1Storetherstcommand-lineargumentina
oating-point variable2Callthesinefunction
IntrotoFortran95programming
CompilingandlinkingFortranprograms
Thecode
PROGRAMhw1
IMPLICITNONE
DOUBLEPRECISION::r,s
CHARACTER(LEN=80)::argv!Inputargument
CALLgetarg(1,argv)!AC-function
r=a2d(argv)!Ourownasciito !double s=SIN(r)!TheintrinsicSINE !functionPRINT*,'HelloWordsin(',r,')=',s
ENDPROGRAMhw1
IntrotoFortran95programming
CompilingandlinkingFortranprograms
Dissection(1)
ContrarytoC++thecompilerdoesnotneedtosea
Onlyexternalfunctionsmustbedeclared
CommentsinFortran95arethe!onaline
ThecodeisfreeformatunlikeFortran77
IntrotoFortran95programming
CompilingandlinkingFortranprograms
Dissection(2)
PROGRAMprogram
nameandendswiththestatementEND withtheoptionalPROGRAMprogram name builtintransferofcommandlineargumentsIntrotoFortran95programming
CompilingandlinkingFortranprograms
Dissection(2)
FloatingpointvariablesinFortran
1REAL:singleprecision
2DOUBLEPRECISION:doubleprecision
havetowritethisoneyourself aspecicdeclarationIntrotoFortran95programming
CompilingandlinkingFortranprograms
Aninteractiveversion
fromthecommandlineREAD(*,*)r
s=SIN(r) !etc.IntrotoFortran95programming
CompilingandlinkingFortranprograms
ScienticHelloWorldinFortran77
C234567
PROGRAMhw1
REAL*8r,s
CHARACTER*80argv
CALLgetarg(1,argv)
r=a2d(argv)quotesdbs_dbs3.pdfusesText_6[PDF] fortran 90
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[PDF] fortran 90 function
[PDF] fortran 90 handbook pdf
[PDF] fortran 90 pi
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[PDF] fortran 90 textbook pdf
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