1. You have to end your if's with an end - see <a href="http://www.erlang.org/doc/reference_manual/expressions.html#6.7">http://www.erlang.org/doc/reference_manual/expressions.html#6.7</a><br>2. Consider re-writing power using pattern matching and use guard sequences (quite close to the above link in the reference manaul) to make sure that the input data is okay, e.g., math:power(2,0.5) will give you an infinite loop.<br>
<br>Cheers,<br>Torben<br><br><div class="gmail_quote">2008/6/17 Circular Function <<a href="mailto:circularfunc@yahoo.se">circularfunc@yahoo.se</a>>:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
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-module(math).<br>-export([fac/1, sq/1,cube/1,power/2]).<br><br>fac(N) when N>0 -><br> N * fac(N-1);<br>fac(0) -><br> 1.<br> <br>sq(X) -> X*X.<br><br>cube(X) -> X*X*X.<br><br>power(N,P) -><br>
if P==0 -><br> 1;<br> true -><br> if P>0 -><br> N * power(N,P -
1);<br> true -><br> 1 / power(N,-1 * P).<br><br><br>Erlang (BEAM) emulator version 5.6.2 [async-threads:0]<br><br>Eshell V5.6.2 (abort with ^G)<br>1> c(math).<br>./math.erl:20: syntax error before: '.'<br>
./math.erl:2: function power/2 undefined<br>error<br>2> <br><br><br>am i using the "true ->" correctly? it is like else right?<br></td></tr></tbody></table><div class="WgoR0d"><br>
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