Fortran is a programming language created in 1957 by John Backus.
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Fortran (; formerly FORTRAN, derived from Formula Translation) is a generalpurpose, imperative programming language that is especially suited to numeric computation and scientific computing. Originally developed by IBM in the 1950s for scientific and engineering applications, Fortran came to dominate this area of programming early on and has been in continuous use for over half a century in computationally intensive areas such as numerical weather prediction, finite element analysis, computational fluid dynamics, computational physics, crystallography and computational chemistry. It is a popular language for highperformance computing and is used for programs that benchmark and rank the world's fastest supercomputers. Read more on Wikipedia...
! Type your code here, or load an example.
real function square(x)
implicit none
real, intent(in) :: x
square = x * x
return
end function square
PROGRAM hello
PRINT *, "Hello, world!"
END PROGRAM hello
print *,'Hello World'
end
C Hello World in Fortran
PROGRAM HELLO
WRITE (*,100)
STOP
100 FORMAT (' Hello World! ' /)
END
! Codes/HYCOM/hycom/ATLb2.00/src_2.0.01_22_one/
real onemu, twomu
data onemu/0.0098/
data twomu/1./
data threemu/0.e9/
end
program average
! Read in some numbers and take the average
! As written, if there are no data points, an average of zero is returned
! While this may not be desired behavior, it keeps this example simple
implicit none
real, dimension(:), allocatable :: points
integer :: number_of_points
real :: average_points=0., positive_average=0., negative_average=0.
write (*,*) "Input number of points to average:"
read (*,*) number_of_points
allocate (points(number_of_points))
write (*,*) "Enter the points to average:"
read (*,*) points
! Take the average by summing points and dividing by number_of_points
if (number_of_points > 0) average_points = sum(points) / number_of_points
! Now form average over positive and negative points only
if (count(points > 0.) > 0) then
positive_average = sum(points, points > 0.) / count(points > 0.)
end if
if (count(points < 0.) > 0) then
negative_average = sum(points, points < 0.) / count(points < 0.)
end if
deallocate (points)
! Print result to terminal
write (*,'(a,g12.4)') 'Average = ', average_points
write (*,'(a,g12.4)') 'Average of positive points = ', positive_average
write (*,'(a,g12.4)') 'Average of negative points = ', negative_average
end program average
ACCESS ACTION ADVANCE ALLOCATABLE ALLOCATE ASSIGN ASSIGNMENT BACKSPACE BLANK BLOCK CALL CASE CHARACTER CLOSE COMMON COMPLEX CONTAINS CONTINUE CYCLE DATA DEALLOCATE DEFAULT DELIM DIMENSION DIRECT DO DOUBLE ELSE ELSEWHERE END ENDFILE ENTRY EOR EQUIVALENCE ERR EXIST EXIT EXTERNAL FILE FMT FORM FORMAT FORMATTED FUNCTION GO IF IMPLICIT IN INOUT INQUIRE INTEGER INTENT INTERFACE INTRINSIC IOLENGTH 10STAT KIND LEN LOGICAL MODULE NAME NAMED NAMELIST NEXTREC NML NONE NULLIFY NUMBER ONLY OPEN OPENED OPERATOR OPTIONAL OUT PAD PARAMETER PAUSE POINTER POSITION PRECISION PRINT PRIVATE PROCEDURE PROGRAM PUBLIC READ READWRITE REAL REC RECl RECURSIVE RESULT RETURN REWIND SAVE SELECT SEQUENCE SEQUENTIAL SIZE STAT STATUS STOP SUBROUTINE TARGET THEN TO TYPE UNFORMATTED UNIT USE WHERE WHILE WRITE
Feature  Supported  Token  Example 

Scientific Notation  âœ“  
Strings  âœ“  '  'Hello world' 
Assignment  âœ“  =  
Line Comments  âœ“  !  C A comment 
Module Pattern  âœ“  module constants implicit none real, parameter :: pi = 3.1415926536 real, parameter :: e = 2.7182818285 contains subroutine show_consts() print*, "Pi = ", pi print*, "e = ", e end subroutine show_consts end module constants program module_example use constants implicit none real :: x, ePowerx, area, radius x = 2.0 radius = 7.0 ePowerx = e ** x area = pi * radius**2 call show_consts() print*, "e raised to the power of 2.0 = ", ePowerx print*, "Area of a circle with radius 7.0 = ", area end program module_exampl 

Print() Debugging  âœ“  C Hello World in Fortran PROGRAM HELLO WRITE (*,100) STOP 100 FORMAT (' Hello World! ' /) END 

Case Insensitive Identifiers  âœ“  x = 2.0 y = x + X 

Comments  âœ“  C C Lines that begin with 'C' (in the first or 'comment' column) are comments C 

Fixed Point Numbers  X  
Case Sensitivity  X  
Semantic Indentation  X  
Zerobased numbering  X  
MultiLine Comments  X  
hasReservedWords  X  C Keywords are specifically NOT reserved words. http://fortranwiki.org/fortran/show/Keywords. http://rsusu1.rnd.runnet.ru/develop/fortran/prof77/node46.html 