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Fortran Installation on Fedora sudo dnf install gcc-gfortran

Test Commands man gfortran gfortran --version

Output:

GNU Fortran 7.5.0
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Compile a program using 👍🏿 gfortran helloF90.f90 -o hello

---

Hello Fortran

program hello
    print*, "Welcome to the New Fortran!"
end program hello

The "print*" statement is a quick way to output text to the default output unit (usually the console or terminal). program hello: This line indicates the start of the Fortran program named "hello". It's a good practice to give meaningful names to your programs.

print*, "Welcome to the New Fortran!": This line uses the "print*" statement to display the text "Welcome to the New Fortran!" on the output. The asterisk (*) denotes the default output unit. In this case, the text will be displayed on the console or terminal.

To run this Fortran program, you would typically save it with a .f90 or .f95 extension (e.g., hello.f90), then compile and execute it using a Fortran compiler such as gfortran.

---

variables.f90

Code

! This is a Fortran program that declares and prints various types of variables.

! Declare variables with their respective types
implicit none

integer :: area      ! Declares an integer variable named "area"
real :: pi           ! Declares a real (floating-point) variable named "pi"
complex :: degrees   ! Declares a complex variable named "degrees"
character :: vowels  ! Declares a character variable named "vowels"
logical :: binaries  ! Declares a logical variable named "binaries"

! In Fortran, variables are not automatically initialized to zero or any other value.
! This means that the initial values of these variables are undefined.

! Print the values of the declared variables
print *, 'The value of area (integer) is: ', area
print *, 'The value of pi (real) is: ', pi
print *, 'The value of degrees (complex) is: ', degrees
print *, 'The value of vowels (character) is: ', vowels
print *, 'The value of binaries (logical) is: ', binaries

end program variables

This code declares five variables of different types (integer, real, complex, character, and logical) but does not initialize them. It then prints the values of these uninitialized variables, which will typically display random or garbage values since they haven't been assigned specific values.

variablesExample.f90

program variablesEg
    implicit none

    integer :: amount
    real :: pi
    complex :: frequency
    character :: initial
    logical :: isOkay

    amount = 12
    pi = 3.1415927
    frequency = (1.0, -0.5)  ! Use the correct variable name "frequency"
    initial = 'A'
    isOkay = .false.

    print *, 'The value of amount (integer) is: ', amount
    print *, 'The value of pi (real) is: ', pi
    print *, 'The value of frequency (complex) is: ', frequency
    print *, 'The value of initial (character) is: ', initial
    print *, 'The value of isOkay (logical) is: ', isOkay

end program variablesEg