Display Double of entered number

        
<!doctype html>
<html>
   <head>
       <title>Display Double of entered number</TITLE>
   </HEAD>
   <body>
<h1> Display Double of entered number </h1>
       <form name="f1">
            Enter Number:<input type="number" name="tnum"><br>
            <input type="submit" value="Display Double of entered number" onClick="display()">
       </form>
    </body>
    <script language="Javascript">
          function display()
          {
              var d,n;
              n=f1.tnum.value;
              d=n*2;
              document.writeln("Double of entered number is=:"+d);
          }
     </script>
</html>
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