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Fortran Hello World! 

Fortran Hello World! 



Click on RUN button to see the output

Fortran Online Compiler

Write, Run & Share Fortran code online using OneCompiler's Fortran online compiler for free. It's one of the robust, feature-rich online compilers for Fortran language, running on the latest version 7. Getting started with the OneCompiler's Fortran compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as Fortran. OneCompiler also has reference programs, where you can look for the sample programs and start learning. Happy learning!!

Read inputs from stdin

OneCompiler's Fortran online editor supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample Fortran program which takes name as input and prints hello message with your name.

program hello
  character :: name*30
  read *, name
	print *, "Hello ", name
end program hello

About Fortran

Fortran language was initially developed for scientific calculations by IBM in 1957. It has a number of in-built functions to perform mathematical calculations and is ideal for applications which has more mathematical calculations.

Syntax help

Data Types

Data typeDescriptionUsage
IntegerTo store integer variablesinteger :: x
RealTo store float valuesreal :: x
ComplexTo store complex numberscomplex :: x,y
LogicalTo store boolean values True or falselogical :: x=.True. , logical :: x = .FALSE.
CharacterTo store characters and stringscharacter :: x


Variable is a name given to the storage area in order to manipulate them in our programs.

data type :: variable_name


Array is a collection of similar data which is stored in continuous memory addresses.


data-type, dimension (x,y) :: array-name


integer, dimension(3,3) :: cube


1. Do:

Do is used to execute a set of statement(s) iteratively when a given condition is true and the loop variable must be an integer.

do i = start, stop [,step]    
   ! code
end do

2. Do-While:

Do-While is used to execute a set of statement(s) iteratively when a given condition is true.

do while (condition) 
end do

3. If:

If is used to execute a set of statements based on a condition.

if (logical-expression) then      
end if

4. If-Else:

If is used to execute a set of statements based on a condition and execute another set of statements present in else block if condition specified in If block fails.

if (logical-expression) then     
   !code when the condition is true
   !code when the condition fails
end if

5. Case:

Case is similar to switch in C language.

[name:] select case (regular-expression) 
   case (value1)          
   ! code for value 1          
   ... case (value2)           
   ! code for value 2           
   case default          
   ! default code          
end select [name]

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Reference Programs:


No tags available for Fortran

How to use?

Choose the language in which you want to run your program, by clicking the button next to Run. And then write your code in the code box, You can use the auto complete snippets and warnings and errors which helps you to write better code faster way.
Once you are done writing your code click the Run button, now the code will be submitted to OneCompiler and you will see the results in a second.

How to contribute?

Please fork OneCompiler repository and contribute us by adding more languages or the features to the existing OneCompiler backend.
You can also contibute to the community by adding more programs which users can search and use as base code for their programs.

API & More

You can embed OneCompiler into your own website. That helps your website users to write and test their programs within your website.
If you want to run and see the results from your backend you can utilize the OneCompiler API by integrating it with your backend.