fortran_fortran simple math - wikibooks, open books for an open world

3/23/2015 Fortran/FortranSimplemathWikibooks,openbooksforanopenworld

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Fortran/FortranSimplemath

PartoftheFortranWikiBook

Fortranhasthefollowingarithmeticoperators:

+additionsubtraction*multiplication/division**exponentiation(associatesrighttoleft)

Herearesomeexamplesoftheiruse:

i=2+3!setsiequalto5i=2*3!setsiequalto6i=2/3!setsiequalto0,since2/3isroundeddowntotheinteger0,seemixedmodex=2/3.0!setsxapproximatelyequalto2/3or0.666667i=2**3!setsiequalto2*2*2=8

Fortranhasawiderangeoffunctionsusefulinnumericalwork,suchassin,exp,andlog.Theargumentofafunctionmusthavethepropertype,anditisenclosedinparentheses:

x=sin(3.14159)!setsxequaltosin(pi),whichiszero

TheintrinsicmathfunctionsofFortranareelemental,meaningthattheycantakearraysaswellasscalarsasargumentsandreturnascalaroranarrayofthesameshape:

real::x(2),pi=3.14159x=sin((/pi,pi/2/))

Theaboveprogramfragmentsetsthetwoelementsofarrayx,x(1)andx(2),equaltosin(pi)andsin(pi/2)respectively.

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