Gfortran

Question: I would like to understand the basics of how to write and execute a Fortran program on Linux OS.

Can you explain it with a simple example?

Answer: In this article, let us review very quickly how to write a basic Hello World Fortran program and execute *.f program on Linux or Unix OS.

1. Write a Hello World Fortran Program

Create helloworld.f program using the Vim editor as shown below.

$ vim helloworld.f program hello print *,"Hello World!" end program hello

You can also write a shorter version of the hello world Fortran program as shown below.

$ vim helloworld.f PRINT *,"Hello World!" END

2.

Make sure Fortran compiler is installed on your system

Make sure Fortran compiler is installed on your system as shown below.

$ whereis gfortran gfortran: /usr/bin/gfortran /usr/share/man/man1/gfortran.1.gz $ which gfortran /usr/bin/gfortran $ dpkg -l | grep gfortran ii gfortran 4:4.3.3-1ubuntu1 The GNU Fortran 95 compiler ii gfortran-4.3 4.3.3-5ubuntu4 The GNU Fortran 95 compiler ii

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