Fortran-Fundamentals

Hello World in Fortran

Every programming journey starts with Hello World. Let’s write our first Fortran program using modern free-form syntax.

The Code

Create a file named hello.f90:

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program hello …

Variables and Types in Fortran

Fortran’s type system reflects its origins as a language built for numerical computation. Every variable must be explicitly declared with a type before use (when following the implicit none best …

Operators in Fortran

Operators are the verbs of any programming language - they transform values into new values. Fortran, designed from the start to translate mathematical formulas into machine code, has a particularly …

Control Flow in Fortran

Control flow is what turns a list of statements into a program that makes decisions and repeats work. As a structured, imperative language, Fortran offers exactly the constructs you would expect: if …

Functions in Fortran

Functions are how Fortran organizes reusable computation, and they are central to the language’s identity — the name Fortran itself comes from “FORmula TRANslation.” From the …

I/O Operations in Fortran

Input and output are where Fortran’s scientific heritage shines. The language was built to read numeric data, crunch it, and write results — so its I/O system offers precise, column-level …