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Isaiah Kelly
Isaiah Kelly

How to Download, Install, and Use a Free Fortran 90 Compiler on Windows 7

Fortran 90 Compiler for Windows 7 Free Download

Fortran is one of the oldest and most widely used programming languages in the world. It was originally developed in the 1950s by IBM as a high-level language for scientific and engineering computations. Since then, it has evolved through several standards, such as Fortran 77, Fortran 90, Fortran 95, Fortran 2003, and Fortran 2008. In this article, we will focus on Fortran 90, which is a modern and powerful version of Fortran that introduced many new features and enhancements over its predecessors.

Fortran 90 Compiler For Windows 7 Free Download


If you are looking for a free and reliable Fortran 90 compiler for Windows 7, you have come to the right place. In this article, we will explain what is Fortran 90 and why use it, how to choose a Fortran 90 compiler for Windows 7, how to download and install a Fortran 90 compiler for Windows 7, and how to test and run a Fortran 90 program on Windows 7. We will also provide a sample Fortran 90 program and output, as well as answer some frequently asked questions about Fortran 90 compilers for Windows 7.

What is Fortran 90 and why use it?

Fortran 90 is a standard version of Fortran that was published in 1991 by the American National Standards Institute (ANSI) and the International Organization for Standardization (ISO). It is a superset of Fortran 77, which means that it supports all the features of Fortran 77 and adds many new ones. Some of the main advantages of using Fortran 90 are:

  • It supports modular programming, which allows you to organize your code into reusable units called modules.

  • It supports dynamic memory allocation, which allows you to create and manipulate arrays of variable size at runtime.

  • It supports array operations, which allow you to perform arithmetic and logical operations on whole arrays without using loops.

  • It supports user-defined data types, which allow you to create your own data structures with customized attributes and behaviors.

  • It supports operator overloading, which allows you to redefine the meaning of operators for user-defined data types.

  • It supports generic procedures, which allow you to write one procedure that can handle different kinds of arguments.

  • It supports recursive procedures, which allow you to write procedures that can call themselves.

  • It supports pointer variables, which allow you to create and manipulate dynamic data structures such as linked lists and trees.

  • It supports optional and keyword arguments, which allow you to specify default values and names for procedure parameters.

  • It supports intrinsic procedures, which are built-in functions and subroutines that perform common tasks such as mathematical operations, string manipulation, file input/output, etc.

Fortran 90 features and syntax

To give you an idea of how Fortran 90 looks like and how it differs from Fortran 77, here are some examples of Fortran 90 features and syntax:


Fortran 77 syntax

Fortran 90 syntax


C This is a comment

! This is a comment

Free-form source code


program hello ! No need to follow fixed columnsprint *, "Hello, world!"end program hello

Implicit none


program hello ! No need to declare implicit rulesimplicit none ! Explicitly declare all variablesprint *, "Hello, world!"end program hello



module math ! Define a module named mathcontains ! Contains procedures and variablesfunction add(x, y) ! Define a function named addreal :: add ! Declare the function typereal, intent(in) :: x, y ! Declare the input argumentsadd = x + y ! Return the sum of x and yend function addend module mathprogram main ! Define a main programuse math ! Use the module mathreal :: a, b, c ! Declare some variablesa = 1.0 ! Assign some valuesb = 2.0c = add(a, b) ! Call the function add from math moduleprint *, "The sum of", a, "and", b, "is", cend program main

Dynamic arrays


program dynamic ! Define a program named dynamicinteger :: n ! Declare an integer variablereal, dimension(:), allocatable :: x ! Declare a dynamic array of real numbersn = 10 ! Assign a value to nallocate(x(n)) ! Allocate memory for x with size nx = 1.0 ! Assign a value to all elements of xx(1) = 2.0 ! Assign a value to the first element of xx(n) = 3.0 ! Assign a value to the last element of xx(2:n-1) = x(1) + x(n) ! Assign a value to the rest of x using array operationsprint *, "The array x is:", x ! Print the array xdeallocate(x) ! Deallocate memory for xend program dynamic

User-defined data types


type point ! Define a user-defined data type named pointreal :: x, y, z ! Declare three components of type realend type pointtype(point) :: p, q, r ! Declare three variables of type pointp%x = 1.0 ! Assign values to the components of p using % operatorp%y = 2.0p%z = 3.0p = point(4.0, 5.0, 6.0) ! Assign values to the components of p using constructor syntaxp = q + r ! Perform arithmetic operations on variables of type point using operator overloading (defined elsewhere)p = add(q, r) ! Call a generic procedure named add (defined elsewhere) that can handle arguments of type point or other types

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