Calculate nth power of 2

        
<!doctype html>
<html>
   <head>
       <title>Calculate nth power of 2</TITLE>
   </HEAD>
   <body>
<h1>Calculate nth power of 2</h1>
       <form name="f1">
            Enter power of value:<input type=number name="tpow"><br>           
            <input type="submit" value="calculate nth power of two" onClick="display()">
       </form>
    </body>
    <script language="Javascript">
          function display()
          { 
              event.preventDefault();
              var n,p=1;
              n=f1.tpow.value;
              //alert("entered number="+n);
              for(i=1;i<=n;i++)
              {
                 p=p*2;
              }
              document.writeln("2^"+n+"="+p);
          }
     </script>
</html>
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