architecture sample of ent is

  constant pi : real := 3.14159;

begin

  process is
    variable counter : integer;
  begin
    -- . . .         --  statements using pi and counter
  end process;

end architecture sample;

<div align="center"><br /><script type="text/javascript"><!--
google_ad_client = "pub-7293844627074885";
//468x60, Created at 07. 11. 25
google_ad_slot = "8619794253";
google_ad_width = 468;
google_ad_height = 60;
//--></script>
<script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
</script><br />&nbsp;</div>