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shayan
Posted: Mon Jul 07, 2008 3:14 am Reply with quote
Joined: 06 Jul 2008 Posts: 2 Location: Göteborg,Sweden
Yes sure.i just started to learn Module and i just wanted to play around with it.so i wanted to write some function as below and as it stated in the book(Programming Erlang) page 34 chapter3(Sequential programming):
-module(geometry).
-export([area/1]).
area({rectangle,Width,Ht}) -> Width * Ht;
area({circle,R}) -> 3.14159 * R * R.

but whenever i just write the first line:
-module(geometry).
i get this error message:
** exception error: undefined function shell_default:module/1
So that, i can't continue with the rest and that is all about it.
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michal
Posted: Mon Jul 07, 2008 1:19 pm Reply with quote
User Joined: 20 Jul 2006 Posts: 44 Location: London
You should save the source code of your module in a file geometry.erl and then compile it. On page 35 Joe explains how to compile your module. You cannot type the entire source of a module in Erlang shell, this is why you get error messages.

/Michal

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