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    <div class="moz-cite-prefix">Nope, Thanks for the patience with me.<br>
      <br>
      So area is the function with 1 argument a array with the shape and
      the parameters to calculate it.<br>
      <br>
      Roelof<br>
      <br>
      <br>
      <br>
      Hynek Vychodil schreef op 25-1-2015 om 14:23:<br>
    </div>
    <blockquote
cite="mid:CAL_wnpdmeVVtZTzRjaqtWxHk97B2Fbh_tkm8i7yMZ-pi3Yz8PQ@mail.gmail.com"
      type="cite">
      <div dir="ltr">Sorry, typo I mean area/1 and arity 1 because you
        have only one parameter.</div>
      <div class="gmail_extra"><br>
        <div class="gmail_quote">On Sun, Jan 25, 2015 at 1:24 PM, Roelof
          Wobben <span dir="ltr"><<a moz-do-not-send="true"
              href="mailto:r.wobben@home.nl" target="_blank">r.wobben@home.nl</a>></span>
          wrote:<br>
          <blockquote class="gmail_quote" style="margin:0 0 0
            .8ex;border-left:1px #ccc solid;padding-left:1ex">
            <div bgcolor="#FFFFFF" text="#000000">
              <div>Sorry, now im totally confused .<br>
                <br>
                where does the name array come from and why a arity 1 ?<br>
                <br>
                Roelof<br>
                <br>
                <br>
                Hynek Vychodil schreef op 25-1-2015 om 13:07:<br>
              </div>
              <div>
                <div class="h5">
                  <blockquote type="cite">
                    <div dir="ltr">Hi,
                      <div><br>
                      </div>
                      <div>You don't have any functions named square,
                        circle or triangle. You have only one function
                        array/1 with four function clauses, the first
                        for square, the second for circle, the third for
                        triangle and the fourth catch-all one.</div>
                      <div><br>
                      </div>
                      <div>Hynek</div>
                    </div>
                    <div class="gmail_extra"><br>
                      <div class="gmail_quote">On Sun, Jan 25, 2015 at
                        12:29 PM, Roelof Wobben <span dir="ltr"><<a
                            moz-do-not-send="true"
                            href="mailto:r.wobben@home.nl"
                            target="_blank">r.wobben@home.nl</a>></span>
                        wrote:<br>
                        <blockquote class="gmail_quote" style="margin:0
                          0 0 .8ex;border-left:1px #ccc
                          solid;padding-left:1ex">Thanks,<br>
                          <br>
                          That error messages disappear.<br>
                          <br>
                          As I understand it right. The eror message is
                          on all functions so on the square, circle and
                          triangle functions.<br>
                          And if not so, why also not a error functions
                          on the other two.<br>
                          <br>
                          Roelof<br>
                          <br>
                          <br>
                          <br>
                          <br>
                          Taavi Talvik schreef op 25-1-2015 om 12:22:
                          <div>
                            <div><br>
                              <blockquote class="gmail_quote"
                                style="margin:0 0 0 .8ex;border-left:1px
                                #ccc solid;padding-left:1ex"> Until you
                                export your functions, they remain local
                                to<br>
                                module. And compiler sees here, that
                                they are not used<br>
                                locally here.<br>
                                <br>
                                Try adding<br>
                                -export([area/1]).<br>
                                <br>
                                best regards,<br>
                                taavi<br>
                                On 25 Jan 2015, at 13:12, Roelof Wobben
                                <<a moz-do-not-send="true"
                                  href="mailto:r.wobben@home.nl"
                                  target="_blank">r.wobben@home.nl</a>>

                                wrote:<br>
                                <br>
                                <blockquote class="gmail_quote"
                                  style="margin:0 0 0
                                  .8ex;border-left:1px #ccc
                                  solid;padding-left:1ex"> Hello,<br>
                                  <br>
                                  I have this programm  :<br>
                                  <br>
                                  -module(shapes).<br>
                                  <br>
                                  -import(math, [sqrt/1]).<br>
                                  <br>
                                  area({square, Side}) -><br>
                                     Side * Side ;<br>
                                  <br>
                                  area({circle, Radius}) -><br>
                                     math:pi() * Radius * Radius;<br>
                                  <br>
                                  area({triangle, A, B, C}) -><br>
                                     S = (A + B + C)/2,<br>
                                     math:sqrt(S*(S-A)*(S-B)*(S-C));<br>
                                  <br>
                                  area(Other) -><br>
                                     {error, invalid_object}.<br>
                                  <br>
                                  <br>
                                  As soon I as try to compile it , I see
                                  these messages :<br>
                                  <br>
                                  <br>
                                  6> c(shapes).<br>
                                  shapes.erl:5: Warning: function area/1
                                  is unused<br>
                                  shapes.erl:15: Warning: variable
                                  'Other' is unused<br>
                                  <br>
                                  Why does Erlang do this?<br>
                                  On compile time you cannot see which
                                  functions are used and which not in my
                                  oponion.<br>
                                  <br>
                                  Roelof<br>
                                  <br>
                                  <br>
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