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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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