sum of digits

        
<!doctype html>
<html>
   <head>
       <title>sum of digits</TITLE>
   </HEAD>
   <body>
	<h1>sum of digits</h1>
       <form name="f1">
           Enter 3 digit number:<input type=number name="nnum" min=100 max=999>
           <input type="submit" value="Display sum of digit" onClick="display()">
       </form>
    </body>
    <script language="Javascript">
          function display()
          {
              event.preventDefault();
              var n,sum=0,a;
              n=f1.nnum.value;
              while(n>0)
              {
                   a=n%10;
                   sum=sum+a;
                   n=parseInt(n/10);
              }
              document.writeln("Sum of digit of entered number="+sum);
          }
     </script>
</html>

Enter 3 digit number:

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