Fortran Study Notes

Array Operations and Slicing

Whole-array arithmetic, array sections, and the WHERE/FORALL constructs that let Fortran express vectorized operations without explicit loops.

Arrays in Fortran

Declaring, indexing, sectioning, and efficiently looping over Fortran's column-major arrays.

Building a Numerical Solver

A hands-on walkthrough of designing, implementing, and validating an iterative linear-equation solver in Fortran.

Conditionals in Fortran

How Fortran branches execution with block IF-THEN-ELSE, SELECT CASE, and logical operators.

Derived Types

Learn how Fortran's TYPE construct lets you bundle related data of different kinds into a single named structure, and how to declare, initialize, and access it.

Error Handling in Fortran

Learn Fortran's status-code-based approach to error handling, covering I/O error checking, allocation failures, and structured patterns for building robust pro…

File Handling in Fortran

Opening, reading, writing, and closing files in Fortran using OPEN/CLOSE, unit numbers, and formatted, list-directed, and unformatted access modes.

Formatted I/O

How Fortran's FORMAT edit descriptors give precise, column-aligned control over how numbers and text are printed and read.

Fortran Best Practices

Practical guidelines for writing clean, portable, and performant modern Fortran code, from type safety to array handling.

Fortran Data Types and Variables

An overview of Fortran's intrinsic data types, integer, real, character, logical, and complex, and how to declare and initialize variables.

Fortran Interview Questions

Commonly asked Fortran interview questions covering language fundamentals, array semantics, and HPC concepts.

Fortran Program Structure

How a Fortran program is organized, from the program statement and implicit none through declarations, executable statements, and program units.

Fortran Quick Reference

A condensed cheat sheet of core modern Fortran syntax, intrinsics, and conventions for day-to-day coding.

Fortran vs Modern Languages

How Fortran compares to C++, Python, Rust, and Julia for numerical and scientific computing workloads.

Installing a Fortran Compiler

A practical guide to choosing, installing, and testing a Fortran compiler such as gfortran on Windows, macOS, and Linux.

Interfaces and Generic Procedures

Learn how explicit interfaces make procedure calls safe and how generic interfaces let one name dispatch to multiple type-specific implementations, including o…

Interfacing Fortran with C

Learn to safely call C functions from Fortran and expose Fortran routines to C using the standardized iso_c_binding module.

Intrinsic Functions

The built-in numeric, array, and character functions Fortran provides out of the box, from SQRT and MOD to SUM, MAXVAL, and TRIM.

Loops in Fortran

Fortran's DO, DO WHILE, and indefinite loop constructs, plus EXIT and CYCLE control flow.

Modules in Fortran

Packaging types, data, and procedures into reusable, compile-time-checked Fortran modules.

MPI Basics in Fortran

Get started with distributed-memory parallelism in Fortran using MPI's rank/size model, point-to-point messages, and collective operations.

Multidimensional Arrays

How Fortran declares, stores, and loops over arrays with two or more dimensions, and why column-major order shapes fast code.

Numerical Computing in Fortran

Master precision control, whole-array operations, LAPACK/BLAS integration, and floating-point pitfalls for reliable numerical Fortran code.

Object-Oriented Fortran

Explore how modern Fortran supports encapsulation, inheritance via type extension, and runtime polymorphism through CLASS and SELECT TYPE.