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# Fortran Cheatsheet

## Overview of unique features

- High-performance programming language
- Designed for scientific and engineering applications
- Supports array operations and linear algebra
- Uses verbose syntax
- Can be used for numerical simulations and modeling

## Variables

PROGRAM MYPROGRAM

IMPLICIT NONE

INTEGER :: X = 42

REAL :: Y

PARAMETER (MYCONST = 10)

INTEGER, DIMENSION(3) :: MYARRAY = [1, 2, 3]

END PROGRAM MYPROGRAM

## Functions

FUNCTION ADD(X, Y)

IMPLICIT NONE

INTEGER, INTENT(IN) :: X, Y

ADD = X + Y

END FUNCTION ADD

PROGRAM MYPROGRAM

IMPLICIT NONE

INTEGER :: RESULT

RESULT = ADD(3, 4)

END PROGRAM MYPROGRAM

## Loops

DO I = 1, 10

! do something

END DO

DO WHILE (CONDITION)

! do something

END DO

## Conditionals

IF (X > Y) THEN

! do something

ELSE

! do something else

END IF

## Array operations

REAL, DIMENSION(3) :: X = [1.0, 2.0, 3.0]

REAL, DIMENSION(3) :: Y = [4.0, 5.0, 6.0]

! Element-wise addition

X = X + Y

! Element-wise multiplication

X = X * Y

! Dot product

DOT_PRODUCT = DOT_PRODUCT(X, Y)

## Resources

- [Fortran documentation](https://fortran-lang.org/learn/)
- [Fortran tutorial](https://www.tutorialspoint.com/fortran/index.htm)
- [Fortran forum](https://stackoverflow.com/questions/tagged/fortran) for community support and troubleshooting.