<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
<HTML>
<HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii">
<META NAME="Generator" CONTENT="MS Exchange Server version 6.5.7226.0">
<TITLE>A question about ERL</TITLE>
</HEAD>
<BODY>
<!-- Converted from text/rtf format -->
<P><FONT SIZE=2 FACE="Arial">Hi all,</FONT>
</P>
<P><FONT SIZE=2 FACE="Arial">I am a new comer in the Erlang world. By looking at the following lines on an Erlang shell, I have one question regarding Erlang.</FONT></P>
<P><FONT SIZE=2 FACE="Arial">Line 6 is not successful which says Hello is unbound. However, line 7 is okay. I am thinking that 'unbound' means that the Erlang shell can't determine the end of the string 'Hello'. But it is okay for string 'hello'. Can't a string with capital letter be used in such case?</FONT></P>
<P><SPAN LANG="zh-cn"><FONT COLOR="#FF0000" SIZE=2 FACE="宋体">6> io:format("this is a test!~w~n",[Hello]).</FONT></SPAN>
<BR><SPAN LANG="zh-cn"><FONT COLOR="#FF0000" SIZE=2 FACE="宋体">** 1: variable 'Hello' is unbound **</FONT></SPAN>
<BR><SPAN LANG="zh-cn"><FONT COLOR="#FF0000" SIZE=2 FACE="宋体">7> io:format("this is a test!~w~n",[hello]).</FONT></SPAN>
<BR><SPAN LANG="zh-cn"><FONT COLOR="#FF0000" SIZE=2 FACE="宋体">this is a test!hello</FONT></SPAN>
<BR><SPAN LANG="zh-cn"><FONT COLOR="#FF0000" SIZE=2 FACE="宋体">ok</FONT></SPAN>
<BR><SPAN LANG="zh-cn"><FONT COLOR="#FF0000" SIZE=2 FACE="宋体">8> </FONT></SPAN>
</P>
<BR>
</BODY>
</HTML>