One way woul be to represent them usnig a data structure. If it's only artihmetic operations, it should be pretty easy.<br><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">data Arith = Var String</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;"> | Plus Artih Arith</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;"> | Mult Arith Arith</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;"> | Pow Arith Arith</span><br><br>x + y would be Plus (Var "x") (Var "y"), so on so forth..<br><br>You can even use infix constructors like :+:, :*:, :^:<br>
<br><br><div class="gmail_quote">On 4 June 2010 16:37, Martin Drautzburg <span dir="ltr"><<a href="mailto:Martin.Drautzburg@web.de">Martin.Drautzburg@web.de</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
Dear all,<br>
<br>
If I have a problem where I have to select from a set of operations, how would<br>
I print the result?<br>
<br>
Example: If I can chose from (x+y), (x*y), (x^2+y)...<br>
and I feed them all into my problem solver<br>
and it finds that "(x*y) is right", how can I print that string?<br>
<font color="#888888"><br>
--<br>
Martin<br>
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</font></blockquote></div><br><br clear="all"><br>-- <br>Ozgur Akgun<br>