Beginners Erlang - hello_world

Question

I have a similar problem to the this:

-module(hello).
-export([hello_world/0]).

hello_world() -> io:fwrite("hello, world\n").

Result:

(hello_world@PC)8> hello:hello_world().
** exception error: undefined function hello:hello_world/0
(hello_world@PC)9>

but the instructions

"The way to fix that:

Go to: Run configurations
--Erlang
Select tab:
--Environment
then
--Select
check
-- Path
Apply and run."

do not solve my problem.

Is it perhaps my software, because getting hold of some of it was quite troublesome. I have Erlang 5.10.1 R16B with Erlide plug-in (version 0.9.0.201010061109) for Eclipse 4.2.2?

Any help will be appreciated!

Did you compile the module `c(hello`)? – Tom Regner May 08 '13 at 08:54 — Tom Regner, May 08 '13 at 08:54
Where did you find the instructions you were following? – kjw0188 May 08 '13 at 18:24 — kjw0188, May 08 '13 at 18:24

score 3 · Answer 1 · edited Oct 28 '13 at 16:04

3

Did you compile your hello.erl?

c(hello).

After that you get a hello.beam file, and then you can try to execute:

hello:hello_world().

In the directory with the hello.beam file.

edited Oct 28 '13 at 16:04

rabbitisle

100
7

answered May 08 '13 at 08:35

0xAX

20,957
26
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score 0 · Answer 2 · answered May 09 '13 at 16:38

Try this: in your editor window, right click and choose Run As->Erlang application. This will open a shell on a node where your module is compiled and loaded and you can execute hello:hello_world().

When editing the file, it will be compiled and reloaded automatically after save. You don't need to open a new console, just reuse the original one.

Beginners Erlang - hello_world

2 Answers2